Seakeeper 4.5
Seakeeper 4.5 – Advanced Stability for Boats 40-49 Feet
Maximize your comfort on the water with the Seakeeper 4.5, designed to eliminate up to 95% of boat roll for vessels 40-49 feet. This cutting-edge gyroscopic stabilizer delivers smooth, steady performance, making every trip more enjoyable.
With its compact design and efficient power use, the Seakeeper 4.5 is the perfect addition to sportfishers, center consoles, and cruisers.
ELIMINATE BOAT ROLL.
Seakeeper eliminates up to 95% of boat roll. Gone are the days of seasick guests, sea legs and spilled drinks. Seakeeper ensures everyday on the boat is a comfortable one.

Specification
Max Rated Speed | 9,300 RPM |
Angular Momentum at Max Rated RPM | 4,500 N-M-S |
Spool-up Time to Max Rated RPM | 35 minutes (9,300 RPM) |
Spool-up Time to Stabilization | 19 minutes (6,975 RPM) |
Spool-Up Power | 1,950 Watts Max |
Operating Power | 950 – 1,600 Watts |
Operating Power Input | 208-230 VAC @ 20 Amps, 50/60 Hz |
110 VAC @ 30 Amps (50/60 Hz) | |
Control Power | 120 Watts Max |
Control Power Input | 12 VDC @ 15 Amps Max |
Seawater Pump Power Input | 12 VDC @ 15 Amps Max |
Weight | 736 lb ( 333.8kg) |
Envelope Dimensions | 26.56 L x 28.05 W x 20.98 H (inches) 0.675 L x 0.713 W x 0.533 H (meters) |
Noise Output | ~72 dB @ 3.3 feet (1 meter) |
Seawater Supply to Heat Exchanger | 2.5 GPM (9.5 LPM) Minimum 4 GPM (15.2 LPM) Maximum |
Ambient Air Temperature | 32F – 140F (0C – 60C) |
How it Works

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.
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 Demo Boat
