Seakeeper 35

Seakeeper 35


The Seakeeper 35 is designed to eliminate up to 95% of boat roll on boats up to ~100 tons, vessels ~85' and larger. Multiple units can be fitted for larger boats. Unlike traditional external fins, the Seakeeper 35 requires only modest electrical power, has no external appendages—
meaning no drag or risk of snags—and can be installed virtually anywhere on board.

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

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.


Rated Speed5,150 RPM

Angular Momentum at Rated RPM35,000 N-M-S

Anti-Rolling Torque at Rated RPM73,000 N-M

Spool-up Time to Rated RPM65 minutes (5,150 RPM)

Spool-up Time to Stabilization45 minutes (4,380 RPM)

Spool-up Power

AC Motor5000 Watts Max

DC Control240 Watts

Operating Power

AC Motor (sea state dependent)2000 - 5000 Watts

DC Control240 Watts

AC Input Voltage208 - 230 VAC (+/- 10%), 50/60 Hz, Single Phase

DC Input Voltage24 VDC @ 10 Amps

Weight3,920 lbs (1,778 kg)

Envelope Dimensions54.3 L x 55.9 W x 43.5 H (inches) 
1.38 L x 1.42 W x 1.11 H (meters)

Noise Output72-74 dBC at 1 meter

Sea Water Supply to Heat Exchanger53.0 LPM (14 GPM) maximum
38.0 LPM (10 GPM) minimum

Ambient Air Temperature0° - 60° C (32° - 140° F)


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