SHIPBOARD PROPELLER Russian patent published in 1997 - IPC

FIELD: water transport; propellers of shallow-draft high- speed vessels. SUBSTANCE: shipboard propeller has shaft with feathering paddles which are made in form of freely suspended pendulums with buckets at the ends Radius of pendulum suspension. length of pendulum and angles of forces and free oscillations are related by the following relationship: , where K•n_pen is number of oscillations (coefficient K=0.5, 1.5): n_pr is propeller rpm; r is radius of pendulum suspension and l is pendulum length. Propeller may be used for ships having draft of 0.2 m. Propeller is used for creation of thrust and lift. EFFECT: enhanced efficiency and reliability. 2 cl, 4 dwg