公开(公告)号：CA1074889A

公开(公告)日：1980-04-01

申请号：CA268297

申请日：1976-12-20

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNUM RONALD E

IPC: G05D1/00

Abstract: AUTOMATIC HEADING SYNCHRONIZATION CONTROL The automatic heading retention mode of operation of a flight control system for a rotary wing aircraft is discontinued and reestablished through the use of logic circuitry responsive to the bank angle of the aircraft and to the force applied to a control stick by the pilot. When the bank angle of the aircraft exceeds a preselected minimum and the lateral force applied to the cyclic pitch stick also exceeds a predetermined minimum the logic circuit operates to isolate the heading hold control from heading error signals and the heading retention mode of operation is automatically resumed when both of the bank angle and stick force fall below the preselected minimum levels. The invention may also encompass the application to the control mechanism of signals which will cause the aircraft to perform coordinated turns above a preselected minimum airspeed.

公开(公告)号：FR2340589A1

公开(公告)日：1977-09-02

申请号：FR7700998

申请日：1977-01-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNUM RONALD E ,  ADAMS DON LUIS ,  JOHNSON RAYMOND G JR

IPC: B64C27/57 ,  G05D1/00 ,  G08G5/00 ,  G05D1/02

公开(公告)号：DE2701564A1

公开(公告)日：1977-08-04

申请号：DE2701564

申请日：1977-01-15

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNUM RONALD E ,  ADAMS DON LUIS ,  JOHNSON JUN RAYMOND G

IPC: B64C27/57 ,  G05D1/00 ,  G05D1/02 ,  B64C13/22 ,  B64C27/54

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.