Seakeeper 18

Crafted for 65’-75’ boats, up to 56 tons, the
Seakeeper 18 is designed to eliminate up to
95% of boat roll. The Seakeeper 18 is completely
internal, requires only modest electrical power,
and can be installed virtually anywhere on board.

$119,900 (not including installation) Buy Now
Seakeeper 18

Ideal for Boats

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~ 27' - 32'

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~ 33' - 39'

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~ 40' - 45'

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~ 46' - 52'

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~ 50' - 59'

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~ 60' - 69'

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~ 65' - 75'

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~ 70' - 84'

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~ 85' +

Seakeeper 18 shown to scale here on a 73' Absolute Navetta.

Stabilization for Any Occasion

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

Take a Look Under the Hood

Weight 3,010 lbs (1,365 kg)
Dimensions 42.1 L x 43.1 W x 33.4 H
1.069 L x 1.096 W x 0.848 H
View full spec sheet Seakeeper 18

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 18


Rated Speed 7,000 RPM
Angular Momentum at Rated RPM 18,000 N-M-S
Max Anti-Rolling Torque at Rated RPM 34,980 N-M
Spool-up Time to Rated RPM 55 minutes (7,000 RPM)
Spool-up Time to Stabilization 40 minutes (5,600 RPM)
Spool-up Power
AC Motor 4000 Watts Max
DC Motor 240 Watts
Operating Power
AC Input (sea state dependent) 2300 - 3700 Watts
DC Control 240 Watts (24 VDC)
AC Input Voltage (Single Phase) 208 - 230 VAC (+/- 10%), 50/60 Hz, Single Phase
DC Input Voltage 24 VDC @ 10 Amps
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)
Weight (Approximate) 2,250 lbs (1021 kg) Bolt-in Installation
Envelope Dimensions 42.1 L x 43.1 W x 33.4 H (Inches)
1.069 L x 1.096 W x 0.848 H (Meters)

Seakeeper Warranty

To ensure peace of mind, all Seakeeper products come
with a multi-year factory warranty

View Warranty Details
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Seakeeper Brochure
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Seakeeper Brochure
Commercial (HD)