Accession Number : AD0881633

Title :   Height-Velocity Test AH-1G Helicopter.

Descriptive Note : Final rept. 17 Aug-6 Nov 70,

Corporate Author : ARMY AVIATION SYSTEMS TEST ACTIVITY EDWARDS AFB CA

Personal Author(s) : Condon, Gregory W. ; Bailes, Edward E. ; Connor, William J., Jr

Report Date : FEB 1971

Pagination or Media Count : 61

Abstract : The AH-1G height-velocity (H-V) flight test program was conducted at auxiliary test sites near Shafter and Bishop, California. The objective of this program was to develop an operational AH-1G H-V envelope for incorporation into the operator's manual. Near maximum performance H-V envelopes were determined for two gross weights at each of two density altitudes. Operational H-V envelopes were defined from the test data and are valid for all gross weights up to 8300 pounds at density altitudes of sea level and 5500 feet. Although the operational envelopes allow an adequate safety margin, the operational aviator requires additional training to accomplish the specified performance. This training should consist of autorotational entries at all airspeeds for low skid heights and airspeeds below 60 knots for high skid heights. Further AH-1G H-V testing should be conducted to: define the H-V envelopes at gross weights between 8300 and 9500 pounds; determine the autorotational characteristics following a sudden engine failure while accelerating through the recommended takeoff corridor; accurately determine the amount of altitude lost in accelerating to forward airspeed, as a function of pitch rates and pitch attitudes; and to provide data for analysis of skid height above the ground versus advance ratio and density ratio. The operational H-V envelopes and recommended pilot techniques presented in this report should be incorporated into the operator's manual at the earliest possible date. The related information presently in the operator's manual is inaccurate, incomplete and dangerously misleading.

Descriptors :   , (*HELICOPTERS, FLIGHT TESTING), ALTITUDE, VELOCITY, AIRSPEED, AUTOROTATION, PILOTS, INSTRUCTION MANUALS, PREPARATION, PAYLOAD, WEIGHT, AVIATION SAFETY, MISSION PROFILES, ARMY TRAINING, ARMY AIRCRAFT.

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE