Reset speed control for watercraft

Retractable propeller guard for outboard motor or stern...

Retractile protected rudder

Reverse gate for water jet apparatus

Reverse thrust propeller

Reverse thrust propellor

Reversible and self-adjusting propeller device

Reversible camber airfoil

Reversing of water craft having steerable drive power...

Rigging connecting assembly

Ring propeller

Rollable and reefable sail

Roller boom reefing and hoisting of a sail

Roller reefing system for sails and the like

Roller-reefing boom apparatus

Rolling reef system for the mainsail of a sailing vessel

Rotary actuator for push-pull cables

Rotation control system for z-type propulsion apparatus

Rotor blade tip section

Rotor system, particularly a boat propeller system