M. Pollack, F. Warburton, H.C. Curtiss

An interactive real time computer simulation has been developed to study tiltrotor performance and vertical take-off procedures for conventional and variable diameter tiltrotor (VDTR) aircraft designs. Aerodynamic and preliminary design methods were used to define a conventional tiltrotor and five unique VDTR aircraft, primarily intended for commercial application. A test program was conducted with the simulator, emphasizing tiltrotor Category A vertical take-off procedures and performance aspects. This paper introduces the aircraft design specifications, and describes the tiltrotor flight mechanics simulation methodology, computer simulation architecture and graphics features. Results of the simulation study are presented and discussed in detail. Conclusions of this study indicate that while a variable diameter tiltrotor adds complexity and weight to the rotor system relative to a conventional design, significant benefits can be realized with a VDTR design. These benefits include improvements in Category A performance, climb capability, powerplant efficiency, and acoustic levels. The source for some of these improvements is manifested in the characteristics of low disk loading rotors that operate in close lateral proximity to each other in helicopter mode. An improved balance between cruise and contingency power requirements can also be achieved with a VDTR aircraft, enhancing performance and cost considerations associated with powerplant selection. These findings support the VDTR concept and warrant further analyses of VDTR and conventional tiltrotors.

17th European Rotorcraft Forum 1991, Berlin

Conference Paper

englisch

21,0 x 29,7 cm, 23 Seiten

DGLR-Bericht, 1991, 1991-08, 17th European Rotorcraft Forum Proceedings; 1991; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

Dieser Aufsatz ist nicht Teil der Veröffentlichung!

takeoff, tilt rotor aircraft

Bestellbar

1991