Seakeeper 5

Small, but powerful. We pushed performance
engineering to all new levels to create a small,
efficient gyro. The Seakeeper 5 is designed
to eliminate up to 95% of boat roll on ~40’ - 49’
boats, up to ~20 tons.

$32,340 (not including installation) Buy Now
Seakeeper 5

Ideal for Boats

~ 30' - 39'

~ 40' - 49'

~ 50' - 59'

~ 60' - 69'

~ 70' - 84'

~ 85' +

Seakeeper 5 shown to scale here on a SeaRay Sundancer 400.

Stabilization for Small Boats

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
Boston Whaler 350 Outrage
Pursuit S 408
Midnight Express 430

Take a Look Under the Hood

Weight 790 lbs (358 kg)
Dimensions 29.7 L x 30.0 W x 24.7 H (inches)
0.755 L x 0.763 W x 0.626 H (meters)
View full spec sheet Seakeeper 5

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 for life in a vacuum, they are forever isolated from the marine environment.

Active Control

Seakepeeper’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.

Seakeeper 5


Rated Speed 10,700 RPM
Angular Momentum at Rated RPM 5,000 N-M-S
Anti-Rolling Torque at Rated RPM 13,089 N-M
Spool-up Time to Rated RPM 50 minutes (10,700 RPM)
Spool-up Time to Stabilization 35 minutes (9,035 RPM)
Spool-up Power
AC Motor 2000 Watts Max
DC Control 180 Watts
Operating Power
AC Motor (sea state dependent) 1500 - 2000 Watts
DC Control 180 Watts
AC Input Voltage 110 - 230 VAC (+/- 10%), 50/60 Hz, Single Phase
DC Input Voltage 12 VDC @ 15 Amps
Weight 790 lbs (358 kg)
Envelope Dimensions 29.7 L x 30.0 W x 24.7 H (inches)
0.755 L x 0.763 W x 0.626 H (meters)
Noise Output 70-72 dBC at 1 meter
Sea Water Supply to Heat Exchanger 30 LPM (8 GPM) maximum
15 LPM (4 GPM) minimum
Ambient Air Temperature 0° - 60° C (32° - 140° F)
(Seakeeper 5 also comes in a DC version, the SK 3DC - Contact Seakepeer for specs)

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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View The
Seakeeper Brochure
Commercial (HD)