Conceptual Study to Apply Advanced Flight Control Technology to the Coin or Trim Aircraft.

摘要

Investigations of the Variable Deflection Thruster (VDT) for a non-external-moving surfaces (NEMS) flight control system have been extended to determine the effects of finite aspect ratio and part-span blowing at subsonic speeds. Wind tunnel tests have revealed that full-span blowing is more effective than part-span blowing for obtaining lift or rolling moments. It was also shown that the 'lift effectiveness'decreases when the ratio of blown area to wing area decreases or when a part-span blown area is moved toward the wing tip. The results of the wind tunnel study indicate that available theoretical analyses provide satisfactory predictions of jet-flap lift for full span blowing,but further theoretical work is needed,especially to determine the effects of part-span blowing. A study to examine the feasibility of using VDT blowing for primary flight control of COIN (counterinsurgency or TRIM (trails,roads and interdiction missions) aircraft was undertaken. The estimates of the required thrust,mass flow and horsepower seemed reasonable,so duct losses were calculated,and the weight and fuel requirements were estimated. A VDT primary flight control system weighing 480lb was hypothesized,and the maneuvering capability of an aircraft with this NEMS system was compared to the aircraft with conventional controls. It was found that the aircraft performance was generally improved with the NEMS control system. (Author)