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• W2322360067 abstract "Lessons learned from Ryan XV-5 lift-fan research aircraft flight test experience are presented from an engineering test pilot's viewpoint with emphasis placed on application to future STOVL and V/ STOL lift-fan aircraft design. The XV-5A which first flew in 1964 is described, and significant lessons learned from design philosophy and operational experience are discussed with respect to liftfan merits and limitations, conversion systemcharacteristics and instrument approach operations. The consequences of two fatal accidents are briefly discussed. Some recommendations for future designs are also presented. Lift-fan technology research and development, which began back in the mid fifties, culminated in the construction and flight tests of the Ryan XV-5A and XV-5B Vertifan aircraft during the 1964 through 1970 time p e r i ~ d . ' ~ , ~ At the time, that effort spawned a validated V/STOL proof-of-concept with no foreseeable application. Although the remaining XV-5B now resides in a museum, many valuable lessons were learned which are still applicable to future lift-fan aircraft desigm4 Therefore the purpose of this paper is to briefly review, from a former engineering test pilot's perspective, some of the more significant lessons that were learned from the Ryan XV-5 lift-fan research aircraft flight test program that may be of interest to today's designers. Introduction XV-5A Description There is strong evidence of renewed interest in applying advanced lift-fan technology to the design of future military and civil aircraft, such as supersonic short takeoff and vertical landing (STOVL) fighters and a number of commercial transport and general aviation vertical/short takeoff and landing (V/STOL) proposals. With the advent of recent advances in materials and digital flight control technology, the lift-fan concept with its high thrust augmentation characteristics is now reemerging as a viable candidate for V/STOL and STOVL aircraft designs. The Ryan XV-5A which flew for the first time in July 1964, was a twin engine, mid-wing, research aircraft. Two J85-GE-5 turbojet engines were pneumatically cross-ducted to two 62.5 inch (X353-5B) wing lift-fans and one 36 inch (X376) pitch control lift-fan (see figures 1 and 2). Movable vanes (exit louvers), located in the exit plane of each wing fan, vectored thrust from 7 degrees forward to 45 degrees aft of the vertical, and could spoil as much as 25% of fan thrust by pinching action to provide lift control. * Senior Systems Engineer Copyright O 1993 by the American Institute of Aeronautics and Astronautics, Inc. No copyright is asserted in the United States under Title 17, U.S. Code. The U.S. Government has aroyalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyrighted owner. The pilot was provided with conventional helicopter controls. Pitch attitude was controlled by longitudinal stick which actuated pitch-fan thrust-reverser-doors. The collective stick provided height control during hover and slow flight by actuating the wing-fan exit louvers. Lateral stick provided roll control through differential actuation of the wing-fan exit louvers. Fan-mode (low) speed was controlled through a stick-mounted beep switch which changed the fan exit louver angle. Pedal movement provided yaw through differential actuation of fan exit louver angle. The RPM of the two 585 turbojet engines was independently controlled by the throttles, which were locked together and mechanically connected to the twist-grip of the collective lever. Wing fan rpm was neither governed (like the gas turbinepowered helicopter) nor independently controlled, but rather was determined by the combination of the gas power input to the fan from the 585 engines and the loading due to fan flow, which was sensitive to air flow conditions at the fan inlets. The pilot thus used 585 RPM as a direct reading reference for power settings." @default.
• W2322360067 created "2016-06-24" @default.
• W2322360067 creator A5000289095 @default.
• W2322360067 date "1993-08-22" @default.
• W2322360067 modified "2023-09-25" @default.
• W2322360067 title "Lift-fan aircraft - Lessons learned from XV-5 flight experience" @default.
• W2322360067 cites W813689739 @default.
• W2322360067 doi "https://doi.org/10.2514/6.1993-4838" @default.
• W2322360067 hasPublicationYear "1993" @default.
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