RUDDER-STOCK INSTALLED ELECTRIC MOTOR DRIVEN CONTRA-ROTATING PROPELLER FOR THE IMPROVEMENT OF PROPULSION EFFICIENCY, CAPABLE OF IMPROVING THE PERFORMANCE OF A RUDDER-STOCK

摘要

PURPOSE: A rudder-stock installed electric motor driven contra-rotating propeller for the improvement of propulsion efficiency is provided to improve propulsion efficiency without using a complex double inversion propulsion shaft system, since a front propeller and a rear propeller are rotated reciprocally.;CONSTITUTION: A rudder-stock installed electric motor driven contra-rotating propeller for the improvement of propulsion efficiency comprises a front propeller and a rear propeller. The front propeller connects to a shaft system connected to a main engine. The rear propeller is rotated in the opposite direction of the rotation of the front propeller. The front and rear propellers are reciprocally rotated, so the wasted rotational direction kinetic energy of the front propeller is collected by the rear propeller.;COPYRIGHT KIPO 2011