A hydraulic power system comprising a stator (1) having a non-circular cavity with inner wall (2) and a rotor (3) rotatably mounted in the cavity. The rotor (3) has a plurality of radially extending slots formed in its circumference and a vane (18) slidably mounted in each of the slots. Guide means (11)...http://www.google.com/patents/US5328337?utm_source=gb-gplus-sharePatent US5328337 - Guided vanes hydraulic power system
