Seakeeper 3

They say great things come in small packages and we
set out to prove it. The Seakeeper 3 is our biggest
smallest thing yet, specially designed to eliminate roll
on ~35-41 foot boats. Refits have never been easier than
with the Seakeeper 3’s leaning post installation option!

$38,100 (not including installation)
Seakeeper 3

Ideal for Boats


~ 23' - 30'

~ 30' - 36'

3Asset 1

~ 35' - 41'

~ 38' - 44'

~ 40' - 46'

~ 44' - 53'

~ 50' - 60'

~ 50' - 62'

~ 55' - 68'

~ 60' - 75'

~ 70' - 85'

~ 85' - 110'

Size does matter

Which Seakeeper is right for you?

No one knows more about how you boat than you! Enter your boat information and we will guide you through the options so you can decide which Seakeeper is right for you.

View Sizing Guide

Seakeeper 3 shown to scale here on a Contender 35 ST.

Stabilization for Small Boats

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 550 lbs (249 kg)
Dimensions 26.8 L x 27.0 W x 23.1 H (inches)
0.680 L x 0.688 W x 0.587 H (meters)
View full spec sheet Seakeeper 3

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 in a vacuum, they are 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.

Intuitive 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 3


Max Rated Speed 8,450 RPM
Angular Momentum at Max Rated RPM 3,000 N-M-S
Max Anti-rolling Torque at Max Rated RPM 7,853 N-M
Spool-up Time to Max Rated RPM 50 minutes (8,450 RPM)
Spool-up Time to Stabilization 29 minutes (6,337 RPM)
Power Consumption
Spool-Up Power 900 Watts Max @ 12 VDC
Spool-Up Power Input 85 Amps Max
Operating Power 400 - 900 Watts (Sea State Dependent)
DC Power Input 12 VDC @ 30-85 Amps
Control Power 125 Watts
Control Power Input 12 VDC @ 15 Amps Max
Seawater Pump Power Input
Over Current Protection based on installed pump rating
12 VDC @ 15 Amps Max
Weight 550 lbs (249 kg)
Envelope Dimensions 26.8 L x 27.0 W x 23.1 H (inches)
0.680 L x 0.688 W x 0.587 H (meters)
Noise Output <72 dBC at 1 meter
Seawater Supply to Heat Exchanger 2 GPM (7.6 LPM) minimum
6 GPM (22.7 LPM) maximum
Ambient Air Temperature 32° - 140° F (0° - 60° C)

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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Seakeeper Brochure
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Seakeeper Brochure