Seakeeper 9

An evolution of our original M7000, the Seakeeper 9
is the product that changed the boating experience
forever! Specially designed to stabilize boats ~50-60 feet,
or up to ~30 tons.

$108,600 (not including installation)
Seakeeper 9

Ideal for Boats


~ 23' - 30'

~ 30' - 36'

3Asset 1

~ 35' - 41'

~ 38' - 44'

~ 40' - 46'

~ 44' - 53'

~ 50' - 60'

~ 50' - 62'

~ 55' - 68'

~ 60' - 75'

~ 70' - 85'

~ 85' - 110'

Seakeeper 9 shown to scale here on a Sunseeker 54.

The Original Seakeeper

Small & Lightweight

Seakeeper weighs only a small fraction of the boat's displacement

Eliminate Boat Roll

Eliminate up to 95% of boat roll and the danger, fatigue, anxiety, and seasickness that go with it

Flexible & Efficient

Unlike traditional fins, Seakeeper is completely internal and can be installed virtually anywhere

Sea Trials

See for Yourself How Seakeeper
Transforms Your Experience on the Water

See All
Henriques 50
Viking 52
Princess V62

Take a Look Under the Hood

Weight 1,210 lbs (550 kg)
Dimensions 33.5 L x 35.6 W x 28.3 H (inches)
0.85 L x 0.90 W x 0.72 H (meters)
View full spec sheet Seakeeper 9

Innovative Cooling System

Our patented cooling system allows the flywheel to spin at an extremely high rate of speed, providing ultimate performance in the smallest and lightest package possible.

Vacuum Sealed

Seakeeper’s vacuum encapsulation enables the flywheel to spin roughly three times faster, cuts flywheel weight by two-thirds and halves power requirements. Moreover, because the critical components (flywheel, bearings, and motor) are sealed in a vacuum, they are isolated from the marine environment.

Active Control

Seakeeper’s active control optimizes gyro torque, providing an unsurpassed level of performance. Unlike a passively controlled gyro, which must be turned off in the roughest conditions and/or at higher speeds, the Seakeeper is effective at all speeds and can be used in all sea conditions.

Intuitive Dash Display

Control your Seakeeper with the push of a button on our new user-friendly dash display. Not only is the display simple to use, but it integrates into your existing dash units for optimal performance.

Seakeeper 9


Max Rated Speed 9,000 RPM
Angular Momentum at Max Rated RPM 9,000 N-M-S
Max Anti-rolling Torque at Max Rated RPM 18,890 N-M
Spool-up Time to Max Rated RPM 55 minutes (9,000 RPM)
Spool-up Time to Stabilization 28 minutes (6,750 RPM)
Power Consumption
Spool-Up Power 3,000 Watts Max
Operating Power 1,250 - 2,000 Watts (Sea State Dependent)
AC Power Input 20 Amps @ 208 - 230 VAC
50/60 Hz, Single Phase
Control Power 240 Watts
Control Power Input 24 VDC @ 10 Amps Max
Seawater Pump Power Input
Over Current Protection based on installed pump rating
24 VDC @ 10 Amps Max
Weight 1,210 lbs (550 kg)
Envelope Dimensions 33.5 L x 35.6 W x 28.3 H (inches)
0.85 L x 0.90 W x 0.72 H (meters)
Noise Output <70 dBC at 1 meter
Seawater Supply to Heat Exchanger 4 GPM (15.1 LPM) minimum
8 GPM (30.3 LPM) maximum
Ambient Air Temperature 32° - 140° F (0° - 60° C)

Seakeeper Warranty

To ensure peace of mind, all Seakeeper products come
with a multi-year factory warranty

View Warranty Details

How To Buy

If you are buying a new boat, please consult directly with the builder. If you already own a boat and are interested in a refit, please contact Seakeeper directly or consult with one of our Global Partners.

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Seakeeper Brochure
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Seakeeper Brochure