Accession Number : AD0784134

Title :   Yaw Axis Stability Augmentation System Flight Test Report

Descriptive Note : Final rept. 1 Jun 1972-30 Nov 1973

Corporate Author : HONEYWELL INC MINNEAPOLIS MN GOVERNMENT AND AERONAUTICAL PRODUCTS DIV

Personal Author(s) : Ogren, Harvey ; Sotanski, Donald ; Genaw, LeRoy

PDF Url : AD0784134

Report Date : Jun 1974

Pagination or Media Count : 111

Abstract : The report describes the design and flight tests of a hydrofluidic yaw stability augmentation system (SAS) for an OH-58A helicopter. The design objective was to improve stability characteristics in yaw for all flight conditions from hover to 120 kn. The yaw SAS, which initially featured only high-passed yaw rate feedback, was installed in an OH-58A helicopter and flight tested in 1972. Performance at forward flight speeds was satisfactory; but at hover, yaw rates were excessive. The system was then modified to add a straight-through yaw rate feedback term. Flight tests of this configuration were conducted from October-December 1973. Results were satisfactory.

Descriptors :   *FLIGHT TESTING, *HELICOPTERS, AUGMENTATION, FLIGHT CONTROL SYSTEMS, FLIGHT PATHS, HOVERING, MODIFICATION, PERFORMANCE(ENGINEERING), STABILITY, YAW

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE