Marine vehicle using a gyroscopic system to generate power for a propulsion system

A marine vehicle (40, Fig 3) comprises a flywheel 14 having a spin axis S, a drive system 18 adapted to rotate the flywheel about the spin axis and a gimbal support 12 in which the flywheel is rotatably mounted for rotation about the spin axis, the gimbal support being rotatably mounted to a fixed base 4 in the vehicle for precession rotation about a precession axis V which is orthogonal to the spin axis of the respective flywheel. The flywheel, drive system, and gimbal support are comprised in a gyroscopic system mounted and adapted to cause precession rotation about the precession axis when the vehicle moves by at least one of roll motion, pitch motion and yaw motion. A power take-off device 22 is coupled to the gimbal support and comprises a mechanism which damps the precession rotation to generate power in the power take-off device. The vehicle also comprises a propulsion system 24 for providing the vehicle with motive power. The propulsion system is coupled directly or indirectly, to the power take-off device system to receive power generated by the power take-off device which is converted to motive power to propel the vehicle.