Accession Number : AD0282123

Title :   EXPLORATORY FULL-SCALE GROUND AND FLIGHT TEST EVALUATION OF THE ROBERTSON ULTRA-LOW SPEED FLIGHT CONTROL SYSTEM

Corporate Author : SKYCRAFT INC FORT WORTH TX

Personal Author(s) : Robertson, James L

PDF Url : AD0282123

Report Date : May 1962

Pagination or Media Count : 46

Abstract : The results of an exploratory full-scale ground and flight test evaluation of the stability, control, performance, handling, and maintenance characteristics of the Robertson Ultra-Low-Speed Control System (ULS) are presented. The (ULS) consists of a small set of aerodynamic control surfaces placed immediately behind the propeller disk and permanently connected to the airplane's conventional flight control system. The results of this program showed that, at 40 mph., the ULS increased pitch, yaw, and roll control powers to 256, 280, and 250%, respectively, of basic airplane values. This increase also reduced the airplane's minimum speed from a control-limited 40 to a power- limited 20 mph with an attendant 50% reduction in landing and take-off distance. Glide angle was increased from 10 to 20 degrees through installation of the new system. The ULS installation did not appreciably affect stability or handling qualities, and caused no 'oversensitivity' at maximum speed (168 mph). Test results indicate that the rudimentary ULS system tested is a light, simple, and inexpensive way of generating the powerful low-speed control moments required for V/STOL operation.

Descriptors :   *CONTROL SYSTEMS, *FLIGHT TESTING, AERODYNAMICS, CONTROL, CONTROL SURFACES, MAINTENANCE, SHORT TAKEOFF AIRCRAFT, STABILITY, SUBSONIC FLOW, TAKEOFF, VERTICAL TAKEOFF AIRCRAFT

Subject Categories : Aerodynamics
      V/STOL

Distribution Statement : APPROVED FOR PUBLIC RELEASE