Seakeeper 12 HD

Optimized for ~55’ - 64’ boats, up to ~35 tons, the Seakeeper 12HD
is designed to eliminate up to 95% of boat roll. Our gyros
are completely internal, require only modest electrical
power, and can be installed virtually anywhere on board.

$96,495 (not including installation) Buy Now
Seakeeper 12 HD

Ideal for Boats

~ 45' - 54'

~ 55' - 64'

~ 65' - 74'

~ 75' +

Seakeeper 12 HD shown to scale here on a 62’ Patrol Boat.

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 2,195 lbs (996 kg)
Dimensions 42.6 L x 43.2 W x 32.8 H (inches)
1.08 L x 1.1 W x 0.83 H (meters)
View full spec sheet Seakeeper 12 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 12 HD


Rated Speed 4,600 RPM
Angular Momentum at Rated RPM 12,000 N-M-S
Anti-Rolling Torque at Rated RPM 23,040 N-M
Spool-up Time to Rated RPM 45 minutes (4,600 RPM)
Spool-up Time to Stabilization 35 minutes (3,680 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 2,195 lbs (996 kg)
Envelope Dimensions 42.6 L x 43.2 W x 32.8 H (inches)
1.08 L x 1.10 W x 0.83 H (meters)
Noise Output 68-73 dBC at 1 meter
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View The
Seakeeper Brochure
Commercial (HD)