Seakeeper 20 HD

The Seakeeper 20HD is optimized to eliminate up to 95%
of boat roll on boats ~65 - 74 feet, up to ~60 tons. Unlike
traditional external fins, the Seakeeper 20HD requires only
modest electrical power and has no external appendages,
and can be installed virtually anywhere on board.

$157,050 (not including installation) Buy Now
Seakeeper 20 HD

Ideal for Boats

~ 45' - 54'

~ 55' - 64'

~ 65' - 74'

~ 75' +

Seakeeper 20 HD shown to scale here on a 80’ Wind Farm Transfer.

Proceed with Confidence


Designed for longer, rougher use. Seakeeper HD will keep you stable and safe, no matter how long the job

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

Take a Look Under the Hood

Weight 2,960 lbs (1342 kg)
Dimensions 52.7 L x 55.9 W x 40.4 H (inches)
1.34 L x 1.42 W x 1.03 H (meters)
View full spec sheet Seakeeper 20 HD

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 20 HD


Rated Speed 3,850 RPM
Angular Momentum at Rated RPM 20,000 N-M-S
Anti-Rolling Torque at Rated RPM 43,076 N-M
Spool-up Time to Rated RPM 70 minutes (3,850 RPM)
Spool-up Time to Stabilization 50 minutes (3,100 RPM)
Spool-up Power
AC Motor 3000 Watts Max
DC Control 240 Watts
Operating Power
AC Motor (sea state dependent) 1000 - 3000 Watts
DC Control 240 Watts
AC Input Voltage 208 - 230 VAC (+/- 10%), 50/60 Hz, Single Phase
DC Input Voltage 24 VDC @ 10 Amps
Weight 2,960 lbs (1,342 kg)
Envelope Dimensions 52.7 L x 55.9 W x 40.4 H (inches)
1.34 L x 1.42 W x 1.03 H (meters)
Noise Output 72-74 dBC at 1 meter
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View The
Seakeeper Brochure
Commercial (HD)