Accession Number : AD0787428

Title :   Rotor Flow Survey Program UH-1M Helicopter.

Descriptive Note : Final rept.,

Corporate Author : ARMY AVIATION SYSTEMS TEST ACTIVITY EDWARDS AFB CALIF

Personal Author(s) : Boirun,Barclay H. ; Jefferis,Robert P. ; Holasek,Ronald S.

Report Date : MAY 1974

Pagination or Media Count : 75

Abstract : Tests were conducted to determine the rotor wake boundaries and to measure the instantaneous airflow in a test volume adjacent to a UH-1M helicopter under actual flight conditions. The primary test volume of interest was a 4 by 5 by 6-foot box forward of the weapons- mount location. Airflow data were measured by a rake containing 7 split-film total vector anemometers during steady forward airspeeds ranging from hover to 90 knots true airspeed. Flight testing was terminated after one productive flight because of failure of the anemometer instrumentation. However, the data obtained prior to the sensor failure appeared to be of good quality and are presented for analysis. A second test on an AH-1G helicopter is planned, when a correction for the sensor failures is determined. The UH-1M airflow testing was conducted during April and June 1973. (Author)

Descriptors :   *HELICOPTERS, *HELICOPTER ROTORS, *FLOW FIELDS, ROTOR BLADES(ROTARY WINGS), WAKE, AUTOROTATION, VIBRATIONAL SPECTRA, AIR FLOW, AIRSPEED

Subject Categories : Aerodynamics
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE