公开(公告)号：CA1085368A

公开(公告)日：1980-09-09

申请号：CA300455

申请日：1978-04-04

Applicant: UNITED TECHNOLOGIES CORP

Inventor： TEFFT FRANKLIN A ,  ADAMS DON L ,  COTTON LOU S

IPC: B64C27/58 ,  B64C27/54 ,  B64C27/56 ,  G05D1/08 ,  B64C11/34

Abstract: HELICOPTER PITCH RATE FEEDBACK BIAS FOR PITCH AXIS MANEUVERING STABILITY AND LOAD FEEL The longitudinal cyclic pitch channel of a helicopter has a negative pitch rate feedback bias added thereto when flying at higher speeds, thereby to stabilize the pitch axis against aft-load maneuvering instability and/or to induce a requirement for the pilot to provide a countermanding longitudinal cyclic pitch input through his cyclic pitch stick, the normal feel force of which provides an indication to him of the loading of the rotor as a consequence of undergoing pitch rate maneuvers.

公开(公告)号：CA1072195A

公开(公告)日：1980-02-19

申请号：CA239974

申请日：1975-11-18

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNUM RONALD E ,  COTTON LOUIS S ,  TEFFT FRANKLIN A

IPC: B64C13/10 ,  B64D45/04 ,  G01C5/00 ,  G01C21/00 ,  G01C21/20 ,  G01S9/04

Abstract: To prevent inadvertent ground contact of the tail of a helicopter during a landing operation without providing a continuous warning signal for normal landings the altitude and attitude signals are scaled such that when they are equal and opposite in voltage and phase compared to a ground contact curve the comparator will energize a relay for actuating a pilot warning signal. A rate of descent signal biases the altitude signal upward varying in proportion to rate of descent as to enable the pilot to have sufficient warning time to take corrective action.