Seakeeper 35 Cover
Seakeeper 35 Logo
The Seakeeper 35 is designed to eliminate up to 95% of boat roll on boats up to ~100 tons, vessels ~85′ and larger. Multiple units can be fitted for larger boats. Unlike traditional external fins, the Seakeeper 35 requires only modest electrical power, has no external appendages— meaning no drag or risk of snags—and can be installed virtually anywhere on board.

Seakeeper 35

Max Rated Speed5,150 RPM
Angular Momentum at Max Rated RPM35,000 N-M-S
Anti-Rolling Torque at Max Rated RPM73,000 N-M
Spool-up Time to Max Rated RPM88 minutes (5,150 RPM)
Spool-up Time to Stabilization64 minutes (4,380 RPM)
Spool-up Power
Spool-Up Power5000 Watts Max
Operating Power2000 – 5000 Watts (Sea State Dependent)
AC Power Input220 VAC, 50/60 Hz, Single Phase
Control Power240 Watts
Control Power Input24 VDC @ 10 Amps
Seawater Pump Power Input
Over Current Protection based on installed pump rating
220 VAC @ 5 Amps Max
Sea Water Supply to Heat Exchanger53.0 LPM (14 GPM) maximum
38.0 LPM (10 GPM) minimum
Ambient Air Temperature0° – 60° C (32° – 140° F)
Weight3,920 lbs (1,778 kg)
Envelope Dimensions52.8 L x 55.9 W x 42.4 H (inches)
1.342 L x 1.419 W x 1.076 H (meters)
Noise Output72 – 74 dBC at 1 meter


Frequently asked questions

It is a computer controlled gyroscope that eliminates most boat roll, including the fatigue, anxiety and seasickness that goes with it. Because of this game changing effect, PR Nautica have successfuly installed over 30 Seakeeper units worldwide.
Typically, the Seakeeper weighs between 2 and 4% of boat weight, requires half or less the power of air conditioning, and fits in available space down in the after part of the hull. Nothing extends outside the hull and the Seakeeper is a small percentage of the overall volume of the boat.
Seakeepers are sutiable for most boats 30 feet and above. PR Nautica can install the best option on new vessels and as a retro project. Up to 20 tons, vessels 30-50′: Seakeeper 5 Up to 35 tons, vessels 50-65′: Seakeeper 9 Up to 70 tons, vessels 65-80′ : Seakeeper 16 Up to 100 tons, vessels 80-100′: Seakeeper 26 Greater than 100 tons, vessels >100′: Seakeeper 35

Yes, we can fit Seakeepers to both new vessels and aftermarket. The time of a retrofit installtion will vary depending on the Seakeeper and the model of the vessel. Typical installation time is 1-3 weeks. Get in touch for a custom quotation.

Seakeeper projects

As an official Seakeeper Partner we have conducted over 30 exciting Seakeeper projects world wide.

Seakeeper UK Service Center, Installation Center, and Mobile Service Center.

Get in touch to learn more about how Seakeeper can eliminate boat roll, including the fatigue, anxiety and seasickness that goes with it.