Accession Number : AD0677642

Title :   ON THE FEASIBILITY OF REPLACING A HELICOPTER TAIL ROTOR.

Descriptive Note : Technical rept. Jan-Jul 68,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Sowyrda,A.

Report Date : JUL 1968

Pagination or Media Count : 41

Abstract : The feasibility of replacing the tail rotor of a simple helicopter by using fixed aerodynamic surfaces immersed in the rotor wake is examined analytically. Besides furnishing control moments, the major requirements of such surfaces would be to balance the main rotor drive torque. The most challenging flight condition for attaining torque balance is liftoff wherein the rotor torque is high and the dynamic pressure of the wake flow, which provides the energy for the antitorque surfaces, is lowest due to ground effect. (Author)

Descriptors :   (*TAIL HELICOPTER ROTORS, *REPLACEMENT THEORY), FEASIBILITY STUDIES, DOWNWASH, REMOVAL, WAKE, TORQUE, ANTITORQUE ROTORS, HOVERING, STALLING, MOMENTS, AERODYNAMIC CONTROL SURFACES, GROUND EFFECT, PERFORMANCE(ENGINEERING)

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE