Braking system for gyroscopic boat roll stabilizer

A gyroscopic boat roll stabilizer configured to be installed in a boat, comprising:

• a gimbal including a support frame and enclosure configured to precess about a gimbal axis;
• a flywheel assembly rotatably mounted inside the enclosure for generating a torque that is applied to counter a rolling motion of the boat;
• a braking system for controlling precession of the enclosure, the braking system comprising:
• a first actuator connected between the support frame and the enclosure to resist precession in a first direction about the gimbal axis;
• a second actuator connected between the support frame and the enclosure to resist precession in a second direction about the gimbal axis;
• wherein the first actuator and the second actuator are configured to enable precession in the first and second directions;
• a manifold connected in a fluid flow path between the first and second actuators;
• the manifold having a main valve;
• the main valve connected to the first and second actuators by respective fluid lines that allow fluid flow between the main valve and the corresponding actuator;
• wherein the manifold further comprises coolant passages to carry coolant to dissipate heat generated by fluid flow through the main valve.