국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	IN-FLIGHT LIFT-DRAG CHARACTERISTICS FOR A FORWARD-SWEPT-WING AIRCRAFT (AND COMPARISIONS WITH CONTEMPORARY AIRCRAFT)
저자	Edwin J. Saltzman and John W. Hicks
Keyword	Efficiency; Forward-swept wing; Lift-drag; Lift-related drag; Aerodynamic cleanners; Transonic wave drag
URL	http://www.dfrc.nasa.gov/DTRS/1994/PDF/H-1913.pdf
보고서번호	NASA-TP-3414
발행년도	1994
출처	NASA Dryden Flight Research Center
ABSTRACT	Lift (L) and drag (D) characteristics have been obtained in flight for the X-29A airplane (a forward-swept-wing demonstrator) for Mach numbers (M) from 0.4 to 1.3. Most of the data were obtained near an altitude of 30,000 ft. A representative Reynolds number, for M = 0.9 and a pressure altitude of 30,000 ft, is based on the mean aerodynamic chord. The X-29A data (forward-swept wing) are compared with three high-performance fighter aircraft뾲he F-15C, F-16C, and F/A18. The lifting efficiency of the X-29A, as defined by the Oswald lifting efficiency factor, e, is about average for a cantilevered monoplane for M = 0.6 and angles of attack up to those required for maximum L/D. At M = 0.6 the level of L/D and e, as a function of load factor, for the X-29A was about the same as for the contemporary aircraft. The X-29A and its contemporaries have high tran-sonic wave drag and equivalent parasite area compared with aircraft of the 1940s through 1960s.