Seakeeper 5HD

Designed to eliminate up to 95% of boat roll on ~35’ - 44’ vessels, 
up to ~15 tons, the Seakeeper 5HD is completely internal, 
requires only modest electrical power, and can be installed 
virtually anywhere on board.

$42,200 (not including installation) Buy Now
Seakeeper 5HD

Ideal for Boats

~ 35' -44'

~ 45' - 54'

~ 55' - 64'

~ 65' - 74'

~ 75' +

Seakeeper 5HD shown to scale here on a 41' Coastal Interceptor.

Proceed with Confidence

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

Simple installation, quiet operation, and no generator necessary

Take a Look Under the Hood

Weight 870 lbs (395 kg)
Dimensions 29.77 L x 29.71 W x 24.65 H (inches)
0.756 L x 0.755 W x 0.626 H (meters)
View full spec sheet Seakeeper 5HD

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.

New 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 5HD


Rated Speed 8,100 RPM
Angular Momentum at Rated RPM 5,000 N-M-S
Anti-Rolling Torque at Rated RPM 13,075 N-M
Spool-up Time to Rated RPM 35 minutes (8,100 RPM)
Spool-up Time to Stabilization 22 minutes (6,885 RPM)
Spool-up Power
AC Motor 2300 Watts Max
DC Control 125 Watts
Operating Power
AC Motor (sea state department) 1050 - 2300 Watts
DC Control 125 Watts
AC Input Voltage 110 - 230 VAC(+/- 10%), 50/60 Hz
Single Phase
DC Input Voltage 12 VDC @ 15 Amps
Weight 870 lbs (395 kgs)
Envelope Dimensions 29.77 L x 29.71 W x 24.65 H (inches)
0.756 L x 0.755 W x 0.626 H (meters)
Noise Output 70-72 dBC at 1 meter

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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View The
Seakeeper Brochure
Commercial (HD)