US-based Seakeeper, known for gyro-stabilizing systems, has introduced their Vessel Attitude Control System called Seakeeper Ride. This unique system claims to eliminate up to 70 percent of underway pitch and roll. Unlike traditional or interceptor tabs, Seakeeper Ride uses short linear hinged blades incorporated into horizontal electrical rotary actuators that“roll” the blades up and down.

Each unit consist of a glued transom plate, wedge pack (used to angle the unit to meet the shape of the hull bottom), actuator plate (connects the moving parts to the transom plate),seal plate (to support the actuator)and the rotary blade itself, which is shaped similar to an oval but with a flat bottom.

The cylindrical actuator rotates the curved blade up and down to create lift. Seakeeper says it takes less energy to use rotation to drive the blade, than it does to move the blade vertically.In addition, unlike most interceptors, Seakeeper blades only deploy a maximum of one inch (25.4 mm) which results in less energy use and less drag.

The primary benefit of their system, according to Seakeeper, is the fast speed at which the blades can operate. The system takes 1,000 measurements and can make up to 100 adjustments of the blade in one second. Seakeeper says they need to move that fast to counter how fast boat rolland pitch motions change at speed, and that any slower and the system would not be able to get these reductions in roll and pitch rate.

Seakeeper claims their system can adjust faster than motion can be felt by passengers, effectively damping the effects of waves and vessel movement.Their control system requires GPS input and can automatically adjust to different hull types and sea conditions without complex setup procedures.

The system is controlled via compatible multifunction displays or keypads and requires minimal setup beyond sensor zeroing. It’s available for vessels from 26 to 42 feet (eight to 13 metres) and is used by both OEM builders and for aftermarket installation. ride.seakeeper.com