ATTACK

Period of Performance: 01/01/1984 - 12/31/1984

$30K

Phase 1 SBIR

Recipient Firm

Dei-tech Incorporation
703 Middle Ground Boulevard
Newport News, VA 23606
Principal Investigator

Abstract

RECENT ADVANCES IN THE UNDERSTANDING OF FLIGHT AT POST STALL CONDITIONS HAVE SHOWN A POTENTIAL MANEUVERING BENEFIT IN ALLOWING QUICKER MORE AGILE TURNING WITH AN ATTENDANT TIME ON TARGET ADVANTAGE. FURTHERMORE, STALL AND SPIN RECOVERY HAS BEEN SHOWN TO BE MADE MORE EFFECTIVE USING A COMPANY PATENTED, MODIFIED HORIZONTAL CONTROL SURFACE. THIS PROJECT (PHASE I) IS AIMED AT DEVELOPING METHODS FOR THE EXTRACTION OF AERODYNAMIC DERIVATIVES FROM FLIGHT DATA AT HIGH ANGLES OF ATTACK, AND INCLUDES COMPARISON OF THE DERIVATIVES SO DETERMINED WITH WIND TUNNEL DERIVATIVES. IN ADDITION, THE WORK INCLUDES ANALYSIS OF INSTRUMENT ERRORS AND THE PROPAGATION OF THESE ERRORS THROUGH THE DERIVATIVE EXTRACTION PROCESS. A PHASE II EFFORT WOULD DEVELOP HIGH ANGLE OF ATTACK MANEUVERS AIMED AT THE DETECTION OF CROSS DERIVATIVES AND AT ACCELERATION RELATED DERIVATIVES. THESE TESTS WILL ENABLE AN ASSESSMENT OF THE NEED FOR NEW GROUND BASED FACILITIES AND TESTS AS WELL AS MANNED FLIGHT TESTING REQUIREMENTS FOR HIGH ANGLE OF ATTACK FLIGHT. FINALLY, HYSTERESIS EFFECTS WILL BE EXPLORED AT HIGH ANGLES OF ATTACK AND METHODS WILL BE PROPOSED FOR THEIR INCLUSION IN THE EQUATIONS OF MOTION.