Accession Number : AD0697462

Title :   COMMENTS ON V/STOL WIND TUNNEL DATA AT LOW FORWARD SPEEDS,

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : Rae,William H. , Jr. ; Shindo,Shojiro

Report Date : 1969

Pagination or Media Count : 34

Abstract : The paper presents the results of a systematic series of wind tunnel tests that were made to study the problems that are encountered in testing rotors in the transition speed range. The tests showed that there is a minimum speed test limit that is a function of the model size, downwash angle, and tunnel geometry. The application of wind tunnel wall corrections to data above the test limit is valid. However, below the test limit the flow in the tunnel resembles recirculation type flow and wall corrections will not correct for this type flow. (Author)

Descriptors :   (*ROTARY WINGS, *MODEL TESTS), (*VERTICAL TAKEOFF AIRCRAFT, WIND TUNNEL MODELS), EXPERIMENTAL DATA, ACCURACY, CORRECTIONS, AERODYNAMIC CHARACTERISTICS, GROUND SPEED, DOWNWASH, INTERACTIONS, WAKE, TEST METHODS

Subject Categories : Aerodynamics
      V/STOL
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE