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What’s New in Superyacht Stabilization?

Louisa Beckett is the former editor of Motor Boating, ShowBoats International, and Southern Boating magazines, and a longtime contributor to Dockwalk. Over her career, she has written about a wide variety of vessels ranging from Sea-Doos to superyachts, and has had many adventures on the water, including riding in a U.S. Coast Guard “rollover” boat in heavy surf off Cape Disappointment, Washington.

Louisa Beckett explores the latest trends in yacht stabilization systems, from electric actuators to combo installations.

While the yacht stabilization industry continues to roll out technological advances to help counter “the motion of the ocean” each year, the biggest trend over the past decade or so has been just how crucial the stabilization system has become to yacht owners to assure their comfort on board. Today, stabilizers rank right up there with a motor yacht’s engines when it comes to essential equipment.

“I really believe that people pay a lot more attention to the stabilizers now than they did years ago [when] they ‘ticked the box’ and said, ‘We’ve got the stabilizers going in,’” commented John Allen, Quantum Marine Stabilizers founder and president. “Nowadays, there’s not a boat under 90 meters that is not having a proper model test [for] the stabilizers in a model tank in advance of the construction of the boat, and there are discussions backward and forwards between the client and the shipyard about what the performance should be, and how comfortable the owner will be…. In fact, I was just talking to a shipyard we do business with, and they told me that the stabilizer is the most important piece of equipment on the boat right now.”

“The buying public is becoming more and more aware of what [a stabilization system] can do for them and their boating experience,” says Sean Berrie, CEO of Humphree USA . “It’s coming now that at 80 feet and above, you can’t sell a boat without it.”

With so many innovative new gyros, interceptors, and fin stabilizers available for a wider variety of yacht sizes and types than ever before, many owners also are including a stabilizer upgrade as part of their yacht’s next yard period or refit. “We get a lot of people who want to add an interceptor who have gyros on board. And then some, on the bigger scale, that want to add a full system from us,” Berrie says. “They have gyros, and they want to add fins and interceptors because they want to be covered.”

Here’s a look at what’s new in the yacht stabilization market today.

Gyro stabilizer technology utilizes a flywheel spinning at high rpm to generate angular momentum, creating anti-rolling torque within a vessel’s hull. Gyros offer the advantage of reducing a yacht’s roll without requiring any fins or other appendages protruding from the vessel, potentially creating drag while underway. They typically are compact, operate on electric power, and don’t require hydraulic lines installed on board. The “sweet spot” for most gyro stabilization systems is when the boat is stopped, at anchor, or operating at low speeds.

A relatively new technology when compared with fin stabilizers, gyros were first popularized in the yachting marketplace about 15 years ago when the Ferretti Group began offering Mitsubishi’s Anti Rolling Gyros (ARG) in some of its yacht models. Now manufactured by Tohmei in Japan, there are four ARG models available today, ranging up to the 375T, which is suitable for installation in megayachts.

“We have them on a 180-foot Benetti – four 375Ts,” says Steve Gilchrist, president of Coastal Offshore X-cellence , an ARG dealer in Fort Lauderdale. He adds that the Roll-Reduction Simulation Program Mitsubishi developed for the ARG line helps his shop to determine the size and number of gyros needed to stabilize a particular hull. “It tells you which models and how many. You can dial in the roll-reduction you want,” Gilchrist says.

Most of the recent new-product introductions in the yacht gyro stabilizer market have been designed for the smaller-boat end of the spectrum, taking technology developed for larger yachts and making it more compact and efficient. In fact, small gyro units are proving so popular that a number of production and semi-custom boat manufacturers now are designing a dedicated space for a gyro in every new model they launch.

Supporting this trend, Seakeeper recently introduced the smallest-ever gyro stabilizer for recreational boats: the Seakeeper 1. Compact enough to fit beneath a seat on a center console, it’s designed to eliminate 95 percent of boat roll in boats from 23 to 30 feet in length — yacht tender territory. The flush-mounted stabilizer runs on 12V DC power, and because it is encapsulated by vacuum, consumes just 55 amps.

“Our focus has been on small boats, and bringing stabilization to the masses,” says Kelsey Albina, Seakeeper communications manager. However, she adds, Seakeeper’s range of gyros also includes units large enough to install in large yachts and megayachts, typically in multiple-unit combinations.

On the other end of the scale, in March, VEEM unveiled the world’s largest gyro stabilizer, the VG1000 SD. Suitable for installation in vessels ranging from 60 to 90 meters in length, this monster gyro will debut in Damen’s new 73.4-meter Fast Crew Supplier 7011, built for the offshore oil rig crew transfer industry and due to launch by the end of 2020. At the product launch, VEEM announced that the new VG1000 SD is designed to be a stabilization solution for the superyacht industry as well. “VEEM has commenced the production of a third VG1000SD,” says Matteo Pandolfi, sales engineer marine, VEEM Ltd. “All three are for vessels between 165 and 230 feet, with the latest being for a privately owned fast expedition yacht.”

Mid-spectrum, Italian manufacturer Quick S.p.A. has developed a broad range of gyros for the yachting sector called the MC2 X Quick Gyro Stabilizers. While the company’s most recent models have been designed for the smaller end of the boating market, Quick also offers both AC- and DC- powered gyro stabilizers for yachts displacing up to 250 tons. A recent example is the 31-meter CCN Vanadis , which launched last year with two Quick SpA two MC2 Quick Gyro X57 units installed on board.

In addition to new-build installations, Quick is seeing a growing trend in gyro stabilizer refits. “The ability and possibility to install more than one stabilizer is strategic for the refitting and retrofit market,” says Michele Marzucco, president & CEO of Quick S.p.A.

Interceptors

Adjustable vertical blades that extend downward from the base of a boat’s transom, interceptors interact dynamically with the flow of the water beneath the hull of planing and semi-planing vessels to create lift and adjust the vessel’s attitude for better performance and fuel efficiency. Commonly installed as a less-obtrusive alternative to trim tabs, active interceptor systems can sense and automatically control a boat’s pitch and roll while underway, offering stabilization benefits as well.

Depending on the yacht’s hull configuration, interceptors can make a significant contribution to comfort on board. For example, Volvo Penta offers its Active Ride Control (ARC) system, which uses interceptors to smooth out the ride in boats from 35 to 100 feet-plus, and claims that, “ARC effectively diminishes pitch and roll motion by up to 60 percent at cruising speeds.”

In late 2019, IMTRA expanded its Zipwake Dynamic Trim Control System automatic interceptor range, known for its rapid speed of operation, by adding the new Series E for boats from 50 to 100 feet. Series E includes three straight models, three hull tunnel models, and two chine models. Zipwake’s unique 3D control panel gives users precise control of running trim, heel, and heading. Thanks to IMTRA’s NMEA 2000-based network, Zipwake Series E interceptors also can be operated from a multi-function device at the helm.

On the larger end of the yacht scale, Naiad Dynamics offers as part of its diverse stabilization portfolio the automatic Motion Interceptor Ride Control System, designed for vessels up to 300 feet and over that operate in the 20- to 60-knot range. Naiad’s interceptor system includes both hydraulic and electric models. “A recent yacht application is the 69-meter Benetti M/Y Spectre, [which has] a specially designed hull by Mulder,” says Charley Egan, Naiad Dynamics technical documentation engineer. “Naiad Dynamics produced three custom interceptor blades to exactly match the contour of the transom.”

Humphree, another major player in the interceptor systems market, recently unveiled a new series designed for megayachts. “Most recently, we’ve introduced a larger interceptor series for larger vessels, called the HLS series,” says Berrie. “That’s for boats that are 150 to 300 feet.” Humphree HLS active interceptors are powered by a 24-VDC brushless electric motor, so no hydraulics are required. Twenty-five percent more efficient than trim tabs, HLS interceptors also work much more rapidly.

Active fin stabilizers are airfoil-like appendages that extend from a yacht’s hull beneath the waterline. Installed in pairs on opposite sides of the boat, they are operated by servo-motors in the hull; fin stabilization systems also incorporate gyroscopic sensors that measure the yacht’s motion. The fins are designed to create lift and dampen the vessel’s roll motion depending on the sea conditions. Fins have been used to stabilize ships since the 1930s, if not earlier, and serve the largest range of different types of yacht, including full-displacement vessels. Today, they have advanced technologically to the point where they come in a wide variety of shapes and sizes, with or without winglets and other modifications, and can be fixed or retractable. Some manufacturers also offer cylindrical rotor systems that utilize the Magnus Effect to generate hydrodynamic forces to stabilize the vessel.

In the past, most fin stabilizer systems were hydraulic, but today, there’s a growing trend among manufacturers to offer electric versions that run off the vessel’s house system, eliminating the need to accommodate hydraulic piping on board. Electric fin systems are particularly well suited to installation in yachts that also have other electric-powered equipment such as thrusters and windlasses. They also create less noise than some older hydraulic systems, which naturally is very desirable to boat owners.

“While hydraulic systems continue to be an excellent means of powering stabilizers and other shipboard equipment, there has been a trend toward electric power in recent years,” Egan says. “Naiad Dynamics has responded by adapting our fin stabilizers, interceptors, and other devices to operate with electric motors and actuators without the use of hydraulics.”

“Up until this point, most stabilizers had been hydraulic…. Instead of using a hydraulic piston running back and forth, we are using a transmission and an electric motor, and this is all on AC electric power,” says John Champion, sales manager, American Bow Thruster (ABT)-TRAC . “[The yacht] would normally have to have one generator running to support this. It’s right in line with the same amount of power required for hydraulic stabilizers.” He adds, “There is a trend in particular towards going to electric in Europe…. Electric versus hydraulic — it depends on the culture.”

ABT-TRAC recently introduced a new model, the eTRAC 370 Digital Electric Stabilizer, designed for use in yachts 80 to 110 feet in length. Equipped with a central power controller in place of a hydraulic system and designed to run on AC power, the eTRAC 370 is more compact and easier to fit on board a yacht.

CMC Marine already is known for its line of electric fin stabilizers for large yachts, the Stabilis Electra series. Recently, the company expanded its lineup by introducing a new series designed for installation in yachts from 40 to 130 feet: Waveless by CMC Marine. Featuring the same technology as the Stabilis Electra stabilizers, the Waveless series is designed to be ultra-compact, quieter, and highly efficient. Waveless fin stabilizers are AC-powered, but DC versions also are available.

Stabilizing a yacht while it is stopped in a seaway or at anchor requires a different type of fin motion than while the vessel is underway and water is flowing over the fins. This motion has been described as “swinging” or “paddling.” Today, most of the companies that offer at-speed stabilization also offer an at-rest solution as well, either using the same fins in a different mode or by installing a second set of fins designed to operate only when the boat is stopped.

When Quantum Marine first developed and patented its at-rest fin stabilization system in 1999, it essentially named the category; “Zero Speed” has become the “Kleenex” of the yacht stabilization industry. This fall, Quantum installed its latest innovation in the 70-meter Benetti refit project Freedom: the new Dyna-Foil stabilization system. Quantum heralds Dyna-Foil as the only fin system that not only can stabilize a vessel both in Zero Speed mode and underway, but is also fully retractable. “It’s great for Ice Class vessels or for an owner who doesn’t want big fins hanging off the side of the boat while going up the Amazon,” says Allen.

Late last fall, Humphree expanded its line of DC-powered electric stabilizers by adding a new series of larger fins designed for dual or quad installation in yachts from 80 to 165 feet. These fins are designed to stabilize the yacht at 0 to 30 knots, providing what the manufacturer terms “All Speed” stabilization. To power this new series, Humphree developed a new, low-maintenance 24V DC servo actuator. The fins can operate on battery power without a genset running, making for very quiet operation at night.

Side-Power is known for its unique convex Vector Fins — curved fins that work both at rest and while underway in yachts from 52 to 150 feet. The company reports that its hydraulic Vector Fins deliver about 30 percent more stabilizing power than flat fins, creating approximately enough lift to offset any drag they create while underway. This allows Side-Power to use smaller fins for its stabilizing systems than it would if its fins were flat.

“We only make what we call an ‘Any-Speed’ system,” says Prentice Weathers, Imtra Side-Power product manager — stabilizers, hydraulic, and AC thrusters. “If you go to the trouble of installing stabilizers, why the heck wouldn’t you want them all the time is … Side-Power’s theory.” Weathers explained that a vessel typically needs larger fins for at-rest stabilization, but some flat-fin manufacturers also offer smaller fins for operation while the vessel is at speed in order to reduce drag. “We just go for the bigger fin right away…,” he says. “We don’t worry about having a larger fin while at anchor, because there’s no penalty while underway.”

What is the next new innovation on the horizon for fin stabilization? Dynamic Marine Systems (DMS) , maker of several high-tech stabilization systems including the DMS MagnusMaster, based on the Magnus Effect, and the DMS AntiRoll, which utilizes dual-axis fins to stabilize a yacht both underway and at rest, has just introduced a new system for vessels up to 25 meters in length that incorporates a stern thruster. “Our newest addition to the DMS-family is the DMS WaveMaster,” says Lonne van den Kieboom, DMS Holland brand and service engineer. “We just finished the prototype-phase of this new product and we are now moving towards the pilot series. The WaveMaster is based on a completely new perspective: Keep the bow pointed into the swell so that the yacht cannot roll!”

Combination Systems

Another current trend, particularly for refits, is to install systems that combine multiple different types of technology including gyros, interceptors, at-rest, or at-speed stabilizer fins — or all of the above.

Berrie reports, for example, that Jim Smith Tournament Boats recently installed both a Humphree interceptor system and a gyro system on a custom 100-foot sportfish. “Gyro and interceptor… they’re very complementary,” Berrie says. “Gyro works at slow speed and interceptors at speed. They do a nice hand-off there; it’s a nice solution.”

“Side-Power has always said that probably the ideal stabilization system on a boat is a combination of fins and gyros,” says Weathers. “As the boat increases speed, the gyro loses effectiveness, while fins are just hitting their stride.”

Naiad Dynamics offers Total Ride Control®, a custom stabilization package for yachts that can incorporate a wide variety of technology, depending on the vessel’s requirements. “To simultaneously address multiple motions such as roll, pitch, heave, and yaw, ND has a suite of standard products including fins, canards, T-foils, interceptors, trim tabs, spanning foils, air cushions, and Dynamic Hull Vanes, and will configure them to best suit the application into a Total Ride Control® system,” says Egan. “We are now beginning to see a trend of multiple devices controlling multiple motions in motor yachts. It’s something we have been doing for many years in the commercial and military markets and have been strongly advocating for its migration into the yacht market.”

Combination stabilizer systems can be expensive, of course. But if it prevents the boss’s wife from appearing in the wheelhouse with an angry expression on her green-tinged face, installing one might be well worth the price.

This article originally ran in the December 2020 issue of Dockwalk.

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Boat Stabilization: Fins vs. Gyros

• Updated: September 4, 2018

Most owners want to reduce the motion that makes people seasick on their boat, and many have heard about stabilization systems provided by fin stabilizers and gyros. But which is better? And specifically, how do advanced curved-fin systems like Side-Power Vector Fins match up with the most popular gyro systems? Let’s start with the basics and go from there.

Both Vector Fins and gyro systems work well at anchor, assuming you’ve sized the equipment properly. Underway, Vector Fins are usually superior to a gyro because

• the power of the fins increases exponentially with speed;
• the fins can maintain anti-roll force indefinitely while the gyro relies on precession (change in the angle of the gyro’s axis; once the gyro reaches the end of its stroke (or “throw”), the gyro loses its ability to stabilize;
• the fins will also correct list against a steady crosswind while the gyro will quickly run out of precession;
• Vector fins generate significant lift at speed which improves speed and fuel economy over straight fins,
• when a boat goes into a turn, a gyro or straight-fin system will try to keep it level, while the Vector fin system recognizes the difference between a roll and a turn, and banks the boat into the turn to resist the centrifugal force generated. It’s the same sort of effect a banked turn on a race track creates. As a result, with Vector Fins, one barely notices that the boat is turning, and glasses and plates stay put, rather than slide off the table.

Advantages of gyros are that they have no appendage, they are relatively small and compact, and they are well-engineered to minimize the intense heat generated on the bearings by the spinning mass. Gyros come in an attractive package and work well in many circumstances.

Disadvantages of the gyro systems are that they are less effective underway, are heavy, and in some cases, servicing requires removing the unit from the boat. For a 30-knot boat, a gyro must be much bigger–perhaps bigger than space allows–to equal Vector Fins’ performance, so sometimes multiple gyros will be installed. The systems can take up to an hour to “spin up” before they provide full stabilization, also generate noise, may require structural reinforcement, and with few exceptions are wholly dependent on AC power off a generator. In certain sea conditions, their effectiveness is also limited by stroke or precession distance, and when it’s time to replace the main bearings, most gyros must be removed from the boat and returned to the factory for service.

Advantages of Vector Fin stabilizers include the fact that their power increases with speed exponentially and that they generate lift as well as stability, which negates the effect of drag (unlike straight fins). Vector Fins also provide both at-rest and underway stabilization, allow you to bank into turns, and reduce unwanted motions of sway and yaw by up to 30 to 50 percent compared to straight fins. They counteract crosswinds and list, are lighter than gyros by thousands of pounds (depending on size) and allow maintenance of bearings and cylinders to be done in place. Those using hydraulic power can typically use a PTO (power take-off) hydraulic pump on the boat’s engine to get free power underway (it uses AC from a genset or shorepower at rest). An accumulator in the system means less noise and instant response. In fact, the system is virtually silent. The stabilizing force of Vector Fins is directed more vertically than straight fins, increasing efficiency and lift; you can therefore use smaller fins for the same power or larger fins to gain 30 to 50 percent more power than straight fins.

Disadvantages of all fins include the fact that they are appendages and can therefore cause entanglement or be damaged. They create drag, which may be offset by gains in fuel efficiency and speed in the case of Vector Fins. They can also cause sway and yaw, and at anchor they are limited by the length of the fin’s stroke. Also, they need to be positioned roughly in middle of boat so when retrofitting an older boat this may sometimes pose a challenge. Their location also requires ample structure and support for the loads generated. Having said that, a gyro similarly requires significant structural reinforcement and presents similar space challenges.

From a cost standpoint, a detailed analysis of expectations, requirements, and each boat’s suitability should be undertaken by the installer doing the work, but all else being equal, Vector Fins may be equal to or possibly a little less than a gyro installation. There are many factors that will dictate higher and lower costs—for example structural refits needed to add a gyro sometimes make a big difference. Another factor is whether there is space to install either system, and/or what existing equipment will need to be moved in order to create the space for a gyro or fin system.

One of the greatest variables in any stabilization decision is the owner’s expectations. What’s most important? Stabilization at any speed, or optimizing for at-rest performance? If at-rest stabilization is the priority, a smaller gyro will cost less than one that is two or three times the size, which may be what is required for any-speed stabilization. For any-speed stabilization, the equipment cost of a Vector Fin system would be significantly less than a gyro system. We know of boats on which a second and even a third gyro have been added to get satisfactory stabilization; for these boats, a Side-Power Vector fin system would have cost far less.

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Our Fin Stabilizers are optimised for low water resistance, high efficiency and manufactured in advanced materials with unique characteristics.

Exeptional Comfort with Humphree Fin Stabilizers

Experience unmatched stability both at anchor and while cruising with our All Speed Fin Stabilizers.

These fully electric systems are renowned for their minimal energy usage, eliminating the need for a running genset. Lightweight and compact, these stabilizers are preferred by yacht owners worldwide for their advanced materials and efficiency. Enjoy the unique 360° rotation capability at anchor, effectively preventing anchor walking.

Humphree Boat Fin Stabilizers bring cutting-edge technology to your vessel with fast-acting, brushless electric servo units powered by 24 V DC, ensuring maximum comfort without continuous genset operation. The Humphree Fins feature a solid upper edge, showcasing yet another innovation exclusive to our brand. These Fins are designed for easy modification—simply trim the solid part to fit your vessel’s hull, improving customization without the need for lamination.

Combine these Fin Stabilizers with Humphree Interceptors for full stabilization of roll, pitch, and yaw, optimizing both control and fuel efficiency. Explore the advanced boating technology available with Humphree — where innovation meets performance.

Cranchi Settantotto with Humphree Stabilizing Fins at zero speed

We live in an age where exciting innovation can enhance your boating experience. Humphree Electric Boat Fin Stabilizers make the difference between enjoyment and seasickness.

Film sequence from Settantotto, the new Cranchi flagship equipped with Humphree 24V DC electric fins (2x1m2 ) for premium comfort and performance.

Sunseeker Predator 53 Stabilization Sea Trial

The first part of the video shows the unique Humphree All Speed Fin system on a Sunseeker Predator at rest in choppy waters. This Sunseeker Predator 53 is also fitted with Humphree Interceptors. The Active system both trim and stabilizes your boat and changes the attitude of the whilst speeding up and underway. Top speed was increased by 20%, meaning lower RPM at cruising speed. This also means fuel savings.

Sea trial was filmed and performed by JMP Marine Services UK.

Sunseeker Predator 64 with Humphree Electric Fin Stabilizers. At speed.

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Features & benefits

Features and benefits.

• Custom-Ready Design – Humphree Fin Stabilizers feature a solid upper edge for easy cutting and fitting without touching the hull during rotation, eliminating the need for lamination and reducing fiberglass work.

• 24V DC Operation – The Fins operate cleanly without hydraulics and do not require a genset, ensuring efficient and eco-friendly usage.

• 360° Rotation – Designed to combat anchor walk, Humphree Fin Stabilizers can rotate 180° to pull the anchor, keeping the bow against the wind and reducing side waves.

• Flange Mount – The unique fin flange mount design minimizes damage during grounding and simplifies installation.

• All Speed Stabilization – Provides full stabilization both at anchor and at full speed, enhancing safety and comfort.

• Integrated Interceptors – Combined with Interceptors, these Fin Stabilizers offer total motion control for both pitch and roll.

• Compact Size & Low Weight – With a depth of just 310mm from the outside hull, these compact and lightweight Fin Stabilizers are perfect for retrofit installations where space is limited.

Many waterjet boats experience course keeping problems. This is due to the missing underwater lateral area that helps the vessel to keep its course. An added lateral area is most efficient when installed in the very aft of the hull. Having a wing profile Fin gives a corrective force on yaw with minimum resistance. Humphree has developed a series of Fixed Fins that can be bolted to the hull. The bolts have been tested and verified to break off and keep the hull intact to limit the damage to the boat in the event of collision or grounding.

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4 Types of Boat Stabilizers & How Do They Work

Written by J. Harvey / Fact checked by S. Numbers

The more we learn about the various components and mechanisms boats integrate, the more we realize just how crucial the role of each one is. This could not ring truer once you learn about the different types of boat stabilizers and how they minimize rolling motion.  

Passive and active stabilizers all play a role in ensuring passengers’ comfort, assuming they’re well-designed and used properly. They can be further subdivided into gyroscopes, fins, bilge keels, and anti-rolling tanks.  

Read on to learn how each one works.

Table of Contents

Boat Stabilizers Types

1. bilge keels, 3. gyro stabilizers, 4. anti-rolling tanks.

Ever rode a boat and thought, “The rolling motion is making me sick”? Chances are, that vessel doesn’t have a boat stabilizer system or isn’t using it properly. There’s also the possibility that the stabilizer is inadequate for the kind of water conditions it’s in – or worse, has failed.

That’s precisely why you should choose the best stabilizers for boats if you want everyone onboard to enjoy the ride (or at least make it far less unpleasant).  

What does it mean exactly for a stabilizer to be passive or active?

• Passive Stabilizer Systems – These are stabilizers that do not require external power to work. They can dampen unwanted wavy motion by capitalizing on their design, shape, or gravitational forces. Good examples are bilge keels or passive anti-roll tanks.
• Active Stabilizer Systems – The majority of the boat stabilizers available are active, such as active stabilizer fins, active gyroscopes, and active anti-rolling tanks. They’re termed “active” because they need external power to function effectively.

Compared to passive units, active stabilizer systems are more efficient.

Boat Stabilizers Commonly Used Today

In the past, ships stabilizers were only available to larger vessels like cruise ships and containerships. Nowadays, even small boats like yachts, sailboats, and cabin cruisers can feature these components.  

If you’re wondering, “How do stabilizers work on a boat?” You can read their basic functionalities below.  

Bilge keels look like little fins that stick out and interrupt the water flow as the boat rolls. Every time the boat rocks, the keels create a swirling effect called an “eddy”. Think of how whirlpools form every time you stir a spoon in your coffee cup.

These eddies form behind the bilge keels, and they soak up the rolling energy. Usually, boats with hard chines don’t get as much benefit from bilge keels, which is why they often opt for other types of stabilizers.  

• Works best for soft-chine boats
• Simple installation
• Generally effective design
• Doesn’t take up space inside the boat
• Not as effective for hard-chine boats
• Causes sailboats to be slower when sailing windward

Fin stabilizers look like retractable wings on the sides of the hull, usually on the bottom submerged part of it. In large ships, they can be controlled in special rooms where you can move them in or out or tilt them up or down – again, to keep the boat from rolling too much.

When we’re talking about fin stabilizers on boats, we don’t need to look further than the ones being utilized by yachts. Should a big wave hit the boat, the lift from the fins will help the yacht keep one side of it down, so the vessel won’t tip over.  

• Can be controlled to precisely provide the correct amount of lift and torque for stabilization
• Stabilizing effect doubles the faster a boat goes
• Can keep boats steady even if the rolling motion becomes unpredictable
• Improves fuel efficiency
• Lightweight
• Can be remotely operated
• May be entangled with debris, thus, causing more drag
• May sway and yaw in certain conditions
• Price varies a lot

A boat stabilizer gyroscope has a spinning flywheel that is mounted in a frame in such a way that it will be able to move in two different ways. The frame is typically mounted on a specific spot in the engine room, usually in open space below the deck.

The rotating flywheel relies on angular momentum that essentially combines with its own motion to create “precession oscillation”. That force generates large torques that change over time. These sideway torques are in the opposite directions of the roll, thus providing resistance to the swaying motion caused by waves.  

Come to think of it, it’s like the boat gyro stabilizer “dances” with the waves to keep the watercraft steady as she goes.  

• More effective at low speeds or when stationary
• Can be combined with fins
• Versatile application for many circumstances
• Doesn’t protrude, so there’s less risk of entanglement
• Not as effective if the boat reaches higher speeds
• A little noisy
• Takes some time to spin and provide the needed stabilization
• Relies mainly on electric power

Most anti-rolling tanks are admittedly used in ships, but it’s worth discussing them here. These tanks use water to take care of the unwanted motion. Active tanks differ from passive tanks since they use air pressure to control the water’s movements instead.

The tanks come with a roll-sensing device that can detect even tiny angles of roll. Once it does so, it sends a signal to the pump to move water from one side of the ship to the other, essentially keeping the vessel balanced.

• Active tanks require less liquid to deliver tangible rolling motion mitigation
• Doesn’t use external fins that can get entangled
• Simple, reliable design
• Passive tanks don’t need external power to work
• Usage tends to be limited to larger ships
• Active systems tend to be complicated to maintain and have high initial costs

Would you agree that pretty much all types of boat stabilizers play a vital role? After all, not only do they keep passengers comfy during the entire ride, but they also actively prevent instances when a watercraft may capsize. You never know when a rogue wave will hit you out there in the open seas.

I do admit that they’re not 100% reliable, which is why it’s a good thing that research and development are still ongoing to address their limitations.

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Quantum Stabilizers

Marine stabilizers – zero speed™ and beyond.

Since 1985, Quantum has been perfecting the Art of Stabilization . To date, Quantum has installed 1,000’s of stabilizer systems and 85% of yachts over 55m use Quantum’s Zero Speed™.

With a focus on innovation and cutting edge marine technology, the engineers behind Quantum Stabilizers have raised the bar for vessel stabilization systems.

Quantum Zero Speed ™ Stabilizers were introduced in 2000 and proved to establish Quantum as a leader in the industry.  The enhancement of Zero Speed™, redefined the marine industry, for those who had previously suffered from seasickness.  That technology was soon followed by the XT™ Fin, MAGLift™ Rotor and Dyna-Foil™ proprietary technologies.  Today, Quantum is the preferred stabilizer choice for the large luxury yacht market, military and other commercial vessels. 

Quantum Patented Marine Stabilizer Systems

XT Fin™ Ship Stabilizers

Dyna-Foil™ Retractable Stabilizers

MAGLift™ (Magnus Effect) Rotor Ship Stabilizers

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The Science Behind Yacht Stabilisers: How They Prevent Seasickness

Welcome to the world of yacht stabilisers – the ultimate solution to prevent seasickness and enhance your boating experience.

As professional yachtsmen, we understand the importance of a smooth and comfortable journey, and that’s why we’re here to introduce you to the benefits of yacht stabilisers.

Seasickness can ruin your boating experience, leaving you unwell and unable to enjoy the beauty of the open water. But with yacht stabilisers, you can say goodbye to motion sickness and hello to a more enjoyable voyage. Here’s how:

• Improved Stability – Yacht stabilisers provide improved stability on the water, reducing the rolling and pitching motion of your boat. This results in a smoother and more comfortable journey, even in rough sea conditions.
• Increased comfort – Yacht stabilisers help to create a more relaxed atmosphere onboard, as they reduce the boat’s motion and keep you feeling steady on your feet. This enhances the overall comfort of your journey, making it more enjoyable for everyone onboard.
• Enhanced safety – With improved stability, yacht stabilisers increase safety on board, reducing the risk of injury from falls or slips.

Most yachts have stabilisers while cruising and at anchor, which means the yacht won’t rock. If you are prone to seasickness, please ask your Charter Broker to find you a charter yacht with stabilisers. Yacht stabilisers are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a yacht’s roll due to wind or waves. This technology will make cruising and time at anchor more enjoyable, especially for those prone to seasickness.

What are the stabilizers on a yacht?

The following types of stabilisers are available:

Gyroscopic (gyro) stabilisers

Gyroscopic stabilizers, also known as gyro stabilizers or simply gyros, are mechanical systems used on yachts and other vessels to reduce rolling and improve stability in rough seas. They use spinning masses (usually flywheels) to counteract the boat’s motion and keep it stable. The gyro operates by sensing the boat’s rolling motion and then using hydraulic or electrical actuators to apply a counter-force to counteract that motion. The spinning flywheels create a gyroscopic effect, which helps dampen the boat’s rolling motion. Gyroscopic stabilizers can be especially beneficial for yachts exposed to rough or choppy seas, as they can help to provide a smoother, more comfortable ride. They can also help reduce the wear and tear on the vessel and its equipment and improve safety for passengers and crew.

Fixed fin stabilisers

Fixed fin stabilizers are a type of stabilization system used on yachts and other vessels to reduce rolling and improve stability in rough seas. They work by using underwater fins attached to the vessel’s hull and are designed to create lift in response to the boat’s rolling motion. The fins are positioned perpendicular to the waterline and are located near the centre of gravity of the boat. When the boat rolls, the fins create lift on one side of the vessel, which helps to counteract the rolling motion and keep the boat stable. Fixed fin stabilizers can effectively reduce rolling and improve stability, particularly in moderate to heavy seas. They are relatively simple in design and are typically less expensive to install and maintain than other stabilization systems, such as gyroscopic stabilizers.

Retractable fin stabilisers

Retractable fin stabilizers are a type of stabilization system used on yachts and other vessels to reduce rolling and improve stability in rough seas. They work by using underwater fins attached to the vessel’s hull and can be extended or retracted as needed. The fins are positioned perpendicular to the waterline and are located near the center of gravity of the boat. When extended, the fins create lift in response to the rolling motion of the boat, which helps to counteract the rolling motion and keep the boat stable. When not used, the fins can be retracted into the vessel’s hull, reducing drag and allowing for easier manoeuvring. Retractable fin stabilizers offer the flexibility of being able to extend or retract the fins as needed, depending on the sea conditions. They are typically more expensive to install and maintain than fixed fin stabilizers.

The RotorSwing Magnus

The RotorSwing Magnus is a type of stabilization system used on yachts to reduce rolling and improve stability in rough seas. It is a variation of the traditional gyroscopic stabilizer system and is designed to provide improved performance compared to other stabilization systems. The RotorSwing Magnus system uses a spinning rotor to create a gyroscopic effect, which helps to counteract the boat’s rolling motion and keep it stable. Unlike traditional gyroscopic stabilizers, the RotorSwing Magnus system has a unique design that allows the rotor to move freely in response to changes in the boat’s motion, providing improved stabilization performance compared to other systems. One of the benefits of the RotorSwing Magnus system is that it requires less space to install compared to traditional gyroscopic stabilizers, as the rotor can be mounted in a compact, low-profile housing. This can be an advantage for yachts and other vessels that have limited space for stabilization equipment.

Zero-speed stabilisers

Zero-speed stabilizers are a type of stabilization system used on yachts and other vessels to reduce rolling and improve stability while the vessel is stationary (at anchor) or at slow speeds. They work by using underwater fins attached to the vessel’s hull and are designed to create lift in response to the boat’s rolling motion. Zero-speed stabilizers can be particularly useful for yachts that spend much time at anchor or in port and can provide improved comfort and stability in these situations. They are typically less expensive to install and maintain than other stabilization systems, such as gyroscopic stabilizers.

Latest trends in yacht stabilizers from Dockwalk.

These stabilisers are a great way to reduce the rolling and pitching on a yacht and reduce seasickness. Therefore ask your yacht charter broker to get you a yacht with stabilisers to ensure a more comfortable sail.

Videos demonstrating stabilisers:

Are stabilizers really worth it?

• Luke Hammond
• April 23, 2019

Stabilizers and sailing aren’t really used in the same sentence, so when do we see them being used?

Firstly, let’s start with a quick description of what stabilizers are, and how they might work.

Ship stabilizers (or stabilizers) are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship’s roll due to wind or waves. Active fins are controlled by a gyroscopic control system. … Stabilizers are mostly used on ocean-going ships and yachts of all sizes.

Another alternative is a gyrostabilizer . It is a computer-controlled gyroscope, which is comprised of a flywheel that spins at speeds of up to 10,700RPM and is tilted fore and aft in a range of up to 140 degrees to counteract the wave motion imposed on a yacht. Modern gyros have been in use in recreational yachts since about 2007.

So why did stabilizers really see a big spike in use?

When the ‘at anchor’ or more commonly known term ‘Zero Speed’ stabilizers & gyro’s hit the market, sitting at anchor and not rolling about was a huge advantage for many reasons.  So many anchorages are prone to swells that might make even a hardy seafarer feel a little nausea when at the mercy of Mother Nature.

At anchor or zero speed created a new market of seafarers that may have been affected by motion sickness, and let’s be honest, it really does make a huge difference when sitting at anchor.  It doesn’t mean that the yacht isn’t going to roll, but as a general rule, the stabilizers will reduce the roll, in turn reducing the effects of motion sickness.

In previous years we would have to pay more attention to weather conditions and have local knowledge in order to find the best anchorages; however, with the introduction of zero speed, more anchorages are now considered depending on the sea state.

Don’t get me wrong, if it’s rolly out (much like any Christmas or New Years in St Barth’s), it doesn’t matter how good the stabilizers are, it’s still going to be an interesting time.  However, if I had to choose a yacht that didn’t have them installed, I would be seriously reconsidering my options.

If you wanted to really check out how effective these systems are, have a look at a Seakeeper demonstration:

or follow this link: https://youtu.be/wcZq13l7v1k   

In this video, they place two center consoles side-by-side, and it’s almost amazing how well it works. 

These gyrostabilizers have become more and more effective, and are making a big comeback!

In addition to gyro stabilization, the more common fin set-ups are on larger yachts.  They do have their drawbacks, however, are still amazingly effective.  The main companies in this field are Naiad Dynamics & Quantum Stabilizers.

As I mentioned before, if I was looking at buying or building a yacht, I would be 100% in favor of some sort of stabilization.  There are a few factors to consider, which will then help narrow down which system might be the best option for your circumstances.

Yachting is already an amazing industry. This technology just takes being out on the water and enjoying Mother Nature even more enjoyable.

Blue Skies!

Follow my journey @BlueOceanYachting

  #dreambuildplay #yachtcreators #familyyachting

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Buying a new boat?

See our list of builders offering Seakeeper on their boats.

Have an existing boat?

Seakeeper vs. fins.

When it comes to stabilizing your boat, we know you have options. So why should you choose Seakeeper over fin stabilizers?

WHAT ARE FINS?

Fin stabilizers are external appendages affixed to the hull of a vessel below the waterline. They utilize either the movement of the water, or move themselves, to create a force opposite that of the waves. If a wave pushes the boat to starboard, the fin stabilizer pushes back with a force to prevent the boat from rolling.

UNDERWAY VS. ZERO-SPEED

Underway fins can only work to stabilize the boat while it’s underway, utilizing the movement of the water over the fins underwater. More modern fin systems can change position, angling to respond to the boat’s movement and/or water movement. These “zero-speed” fins can move on their own so they can be used while the boat is at rest.

WHAT IS A SEAKEEPER?

Seakeeper is a completely internal, computer-controlled gyroscope that can eliminate up to 95% of boat roll on vessels as small as 23’ and larger than 200’. Inside a vacuum encapsulation, a flywheel spins at speeds of up to 9,750 rpm. When the boat rolls, the sphere tilts fore and aft (precesses), producing a powerful gyroscopic torque to port and starboard that counteracts the boat roll.

THE SEAKEEPER DIFFERENCE

Seakepeer completely distinguishes itself from fin stabilizers in these aspects:

• Zero-speed fins require short bursts of power that far exceed the stored energy requirements of Seakeeper’s spinning flywheel. In other words, fins don’t have the ability to exert a constant roll-reducing torque throughout the vessels entire natural roll period, which can cause the boat to jerk.
• Fins create drag, reducing both speed and efficiency, thus ruling them out for high-speed boats.
• Seakeeper is completely internal with no underwater hull penetrations, unlike fin stabilizers. External fins create a hazard as that can easily hit or snag common underwater features or debris.
• Stabilizing fins are typically only available for boats greater than 40 or 50 feet (12 or 15 meters), so they leave out the majority of boats on the water today.

THE PROOF IS IN THE NUMBERS

On a recent sea trial, we compared the performance of a Seakeeper 18 and a fin system on a Sunseeker 75 Sport Yacht. Testing each separately in the same sea conditions, we found that the Seakeeper offered 88% roll elimination, while the fin system only offered 65%. Need we say more?

THE EASY CHOICE

When you’re buying a boat, or choosing to refit your current boat, you could research for days about everything on board. Between the boat itself, the electronics, power, and other additional options, it can be overwhelming! But when you’re looking for stabilization, the choice is simple, and more than 25,000 Seakeeper Owners can agree! Choosing a Seakeeper over fin stabilizers makes for the most comfortable, efficient boat you’ll ever own.

The 5 W’s Of Your Standard Warranty

We stand behind every one of our products. That’s why we can offer a comprehensive warranty.

Will Seakeeper connect to my MFD?

Seakeeper is compatible with more than 100 multifunction displays. Find out if yours is on the list!

When Not to Use Your Seakeeper

Seakeeper was designed to dampen a boat’s cyclic roll motions. It is not a substitute for adequate hull stability, and it won’t prevent instability of other types, like those caused by improper boat operation.

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Is a Stabilizer Fin Worth Purchasing?

• Thread starter jrivera7294
• Start date May 24, 2011

jrivera7294

• May 24, 2011

I have been seeing lots of bolt on type stabilizer fin on the market. Are they worth purchasing or are they worthless?  

Re: Is a Stabilizer Fin Worth Purchasing? They absolutely make a difference helping a boat get up on plane a bit quicker and reducing porpoising. They are obviously NOT adjustable except by tilt/trim of the engine. I have not personally seen an instance where a planing fin made a boat ride/perform worse than it did without the fin, so for the $50 it's usually worth it. They certainly don't help you stay dry in a beam sea like trim tabs can though!  

Art Bernard

Re: Is a Stabilizer Fin Worth Purchasing? x2 from above and they can help you stay on plane at lower rpm's as well. They do however put added stress on your engine's mounts and your boats transom. If your rig is in good shape it's not a problem. Think of them as a cheap alternative to trim tabs. Art  

Chief Petty Officer

Re: Is a Stabilizer Fin Worth Purchasing? If it ain't broke don't fix it. That said, I run one right now because my motor too large for my boat and it porpoises horribly without a pair of fins on it. With them it's great. My previous motor was a 90hp, and using the giant hydrofoil from West Marine (listed as for motors 40-300hp WHOA that's a big range) I lost 20mph off the top end although it planed nicely at around 12 mph! Swapped that out for small fins from Wal Mart. I needed them on that motor too because in heavy chop sometimes the prop would find its way out of the water. The fins did a great job of keeping a good bite in the water.  

Supreme Mariner

Re: Is a Stabilizer Fin Worth Purchasing? Does your boat have trouble getting on plane now? If so, they may (may) provide some improvement. I am clearly not a big fan....  

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Electric Vector Fins™

The 3rd generation Vector Fins™ are more efficient underway and at anchor. For faster boats the lift from the fins results in improved fuel efficiency compared to flat fins.

How to choose the right technology to stabilize your boat

Learn about the key things to consider when choosing a stabilizing system for your boat.

Why are Vector Fins™ so much better?

The fins' unique shape reduces drag and improves fuel efficiency – translating more of their power into actual roll stabilization. 

Useful links

How do stabilizers affect speed and fuel consumption.

Traditionally, both fin and gyro stabilizers impact speed and fuel consumption, either by the added weight of a gyro or the added water resistance of external fins. In this article, we highlight the various features of modern fin stabilizers that can alleviate these disadvantages.

How much does a stabilization system cost?

The cost of installing a stabilization system on a boat varies depending on whether the boat is new or used, not to mention the boat's design characteristics.

Vector fins™ versus flat fins stabilizers

In our focus to develop the best products for the marine market, we continuously invest to make all of our products even better. In this article we present the difference between flat fins and Vector fins™.

Stabilizer guide

Stabilizers increase the number of occasions you can use your yacht. Want to learn more about stabilizers? Read our full guide here. 

Explore products

Looking to eliminate roll? We'll help you find the right solution for your vessel. See all stabilizers products here.

Our team of engineers can help you answer any questions you may have regarding installing stabilizers on your boat. 

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TRANQUILITY BASE Boat for Sale

49' defever | 2001 | $329,000.

• Yachts for sale
• motoryachts
• Tranquility Base

Last updated May 14, 2024

Tranquility Base Boat | 49' Defever 2001

(LOCATION:  Annapolis MD) This DeFever 49 CPMY  is a serious blue water cruiser with classic style and accommodations. She is heavily built and designed to take you anywhere, in any weather, and do with comfort and style. Whether you are planning a weekend getaway, to live-aboard, or cruise to the islands this 49’ LRC is ready to accommodate. She features a flybridge, aft deck, pilothouse, large open salon, and two staterooms to insure room, comfort, and convenience.

On deck we start at the top with a flybridge with bimini and full enclosure. The upper helm station has a captain’s chair and stainless steel destroyer wheel. Guest seating provides open air space to relax or entertain. The deck space behind the bridge is home for the dinghy, stainless steel dinghy davit, and 6-man liferaft. Below is an open aft deck with hardtop and wet bar.. The aft deck makes a great place to relax, entertain, or dine alfresco. Wide side decks lead forward, there's a ladder down to the swim platform, and  a doorway to the salon.

The salon is open, airy, with teak finish and parquet floors with galley aft. The galley features teak cabinets, Corian countertop, stainless steel double sink, Princess range with oven, microwave / convection oven, and Summit refrigerator/freezer. The traditional U-shape puts everything at arm's length and the open counter includes the chef with everyone in the salon. Forward and up is the pilothouse with lower station, side deck access, settee with table, teak & holly sole.

There are two staterooms. The master stateroom features a queen berth with custom mattress,  under-berth storage, night stand, custom cabinets, and hanging lockers. The ensuite head has a toilet, vanity with mirror, and shower stall with seat. The guest stateroom has double/ queen V berth, under berth storage and hanging locker. The guest / day head has a toilet, mirrored vanity, linen closet, and shower stall. This DeFever also supports electric heat via existing reverse cycle HVAC ducts for winter warmth. Full maintenance logs and records are available. 

Tranquility Base powered by twin Perkins diesel engines designed for economical and dependable performance. Mechanical features include reverse cycle HVAC, generator, hydraulic steering, hydraulic engine controls. She is well equipped, professionally maintained, and ready to cruise.  Call now for more information and to schedule a showing of this DeFever 49. 

Denison Yachting is pleased to assist you in the purchase of this vessel. This boat is centrally listed by World Class Yacht Sales.

Denison Yacht Sales offers the details of this yacht in good faith but can’t guarantee the accuracy of this information nor warrant the condition of this boat for sale. This yacht for sale is offered subject to prior sale, price change, or withdrawal from that yacht market without notice. She is offered as a convenience by this yacht broker to its clients and is not intended to convey direct representation of a specific yacht for sale.

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Tranquility Base HIGHLIGHTS

• Yacht Details: 49' Defever 2001
• Location: Annapolis, MD
• Engines: Perkins
• Last Updated: May 14, 2024
• Asking Price: $329,000
• Maximum Speed: 9 kn
• Max Draft: 4' 7''

Tranquility Base additional information

• Cruising Speed: 8 kn
• Beam: 15' 0''
• Hull Material: Fiberglass
• Fuel Tank: 1 x 1100|gallon
• Fresh Water: 1 x 370|gallon
• Holding: 1 x 90|gallon
• Improvements and or maintenance or upgrades since 2016:
• in 2018, 2020 and summer of 2021: Professionally Bottom was Painted, Zincs replaced, Stabilizers serviced and the running gear painted with Propspeed.
• In spring of 2018 a new canvas enclosure for the entire flybridge was made and installed.
• In spring 2021 teak trim was professionally varnished. Both engines and transmissions and generator were professionally inspected and serviced for the winter trip to the Bahamas.
• In spring of 2021, 6 man Open Ocean Life Raft was repacked and recertified.
• In spring of 2021 AIS (both transmit and receive) was installed.
• In spring of 2021 New 400 watt solar panels were installed with independent controllers to charge house and generator batteries.
• In spring of 2021 New house bank batteries installed 4 8 D's @ 245 AMP each for a total of 990 Amp hours house bank service, This will last days at anchor and run everything except air conditioning and washer dryer. Generator runs for those. Inverter powerful and runs microwave, refrigerator, two ice makers, freezer, coffee maker, etc.... almost no need for the generator to run except when at anchor for long periods of time and with little or no sunshine.
• In summer of 2021, all hydraulic lines and connections for the stabilizers were replaced with new. Stabilizers are oversize for a much better ride.
• In summer of 2021, both heads (vacuflush) were serviced and seals replaced.
• In summer of 2021 Installed New horn, new house sink faucet, new freshwater pump for house water, new raw water pumps for both engines, new heat exchangers for both engines, new alternator for Port engine.
• In spring 2022 the Port and starboard engine transmission coolers were replaced.
• In April of 2022 the boat was short hauled for bottom power wash and clean.   In general. Oil and filters, fuel filters, belts and hoses are inspected and serviced as needed every 100 hours, but in no event later than 200 hours per Perkins Saber Owner Manual.   All work is performed by certified professionals, receipts and records are at hand.

Schedule a Tour of TRANQUILITY BASE

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H-King Marine (RTR) Aquaholic V3 Deep Vee Brushless Racing Boat 730mm (Orange)

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• Product Description
• Product Specifications
• Manuals/Files

The original Aquaholic was a real show stopper with its eye-watering performance and great looks, then came the V2 version with an even more powerful brushless system and redesigned superstructure. Now we have the V3 that sports a new bright orange color scheme, an offset rudder for better turning performance, a relocated power system for better weight distribution, and a clear plastic recovery fin that bolts to the top of the rudder to provide steering control if the boat accidentally gets flipped over.

Retained from the V2 version is the water-cooled 2815 outrunner brushless motor coupled with a high-end water-cooled 60amp ESC that gives you blistering speeds in excess of 60km/hr (37mph) across your favorite lake, pond, or waterway. The Aquaholic V3 has also retained the well-proven deep-vee hull, which gives it incredible speed and stability in a straight line and enables it to dig in and turn on a dime.

This Ready-to-Run (RTR) version is complete with a HobbyKing GT2E AFHDS 2A 2.4ghz 2 channel radio system with a waterproof receiver and a powerful 37g steering servo. The position of the brushless motor on the V3 has been moved rearwards to alter the center of gravity to further improve the handling. This means the drive from the motor to the highly efficient 3-blade metal propeller via the strong 4mm flexible direct drive system is shorter, making it stronger and even more efficient. The aluminum alloy shaft support at the propeller end of the flexible drive system holds the shaft parallel to the hull for optimum thrust and also provides support for the offset rudder.

Features: • V3 sports a new eye-catching Orange color scheme, and offset rudder for improved turning performance • Powerful brushless water-cooled motor system with 60amp water-cooled ESC • Blisteringly fast speeds in excess of 60km/hr (37mph) • Supplied with Hobbyking GT2E 2.4GHz digital proportional radio system and powerful rudder servo • Deep Vee hull for excellent stability and maneuvering • Highly efficient surface piercing metal 3-blade propeller • Strong 4mm flexible drive shaft with rear aluminum alloy support • Includes a clear recovery fin for bolting to the rudder to provide steering control if capsized

Specs: Type: H-King (RTR) Marine Aquaholic V3 Brushless Deep Vee Racing Boat Length: 730mm (28.7in) Beam: 180mm (7.09in) Hull/Superstructure Material: Strong durable ABS Speed: 60+km/hr Motor: Water-cooled 2815 brushless outrunner Speed Controller: 60amp brushless w/BEC Drive: 4mm direct drive flexible shaft Radio System: Hobbyking GT2E AFHDS 2A 2.4ghz 2 Channel Radio System w/ waterproof Receiver Rudder Servo: 37g high-power Color: Orange

Required: 2 x 7.4V (2S) 4000mAh 30C or greater LiPo battery packs 1 x Suitable LiPo battery charger 4 x "AA" batteries for the transmitter

Please note: A copy of the instruction manual can be found under the "Manual/Files" tab.

Important: This manual must be read before operating the Aquaholic, there are some very important checks to do before use.

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Essential RC | Verified Buyer

Serious fun on the water

Apr 12, 2024

Take everything out of the box and it will then take you less than 5 minutes to attach the rudder, prop and transparent recovery fin. Drop in 2 charged 2S4000 packs, 4 x AA batteries into the included transmitter and you are ready to go. We started by ensuring the Aquaholic tracks straight and took the steering rates down to about half way on the dial. Full power and the boat takes no time to get on step. It is plenty quick and ideal for our local boating pond. We got 15-20 minutes out of one set of batteries and charged up to go again. Everyone wanted to have a go! Watch our 1st vid and we'll be back soon racing with our 2nd Aquaholic and other boats in the near future on Essential RC (Find us on Facebook and YouTube) REVIEW HERE: https://youtu.be/16KrUPqm274

Mike | Verified Buyer

This boat is Amazing

This boat is so fast I took it out yesterday after work to our local bay and this thing was tearing up the water. Definitely worth dollar.

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