Results 101 to 110 of about 30,707 (232)
Charge control experiments on a CH-53E helicopter in a dusty environment [PDF]
Charge control tests were carried out on a ground based, Marine Corps helicopter to determine if control of the electric fields acting on the engine exhaust gases could be used to reduce the electrification of the helicopter when it operated in a dusty ...
Hunyady, S. J. +2 more
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Flight testing the fixed-wing configuration of the Rotor Systems Research Aircraft (RSRA) [PDF]
The Rotor Systems Research Aircraft (RSRA) is a unique research aircraft designed to flight test advanced helicopter rotor system. Its principal flight test configuration is as a compound helicopter. The fixed wing configuration of the RSRA was primarily
Hall, G. W., Morris, P. M.
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A rotor-mounted digital instrumentation system for helicopter blade flight research measurements [PDF]
A rotor mounted flight instrumentation system developed for helicopter rotor blade research is described. The system utilizes high speed digital techniques to acquire research data from miniature pressure transducers on advanced rotor airfoils which are ...
Haywood, W. S., Jr. +2 more
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The effect of helicopter configuration on the fluid dynamics of brownout [PDF]
, 2008 Brown’s Vorticity Transport Model, coupled to an additional particle transport model, is used to simulate the development of the dust cloud that can form around a helicopter when operating in dusty or desert conditions.
Brown, R., Phillips, C.
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Helicopter rotor trailing edge noise [PDF]
A two dimensional section of a helicopter main rotor blade was tested in an acoustic wind tunnel at close to full-scale Reynolds numbers to obtain boundary layer data and acoustic data for use in developing an acoustic scaling law and testing a first ...
Amier, R. K., Schlinker, R. H.
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Aerodynamic characteristics of a 1/6-scale powered model of the rotor systems research aircraft [PDF]
A wind-tunnel investigation was conducted to determine the effects of the main-rotor wake on the aerodynamic characteristics of the rotor systems research aircraft (RSRA).
Freeman, C. E., Mineck, R. E.
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Pneumatic boot for helicopter rotor deicing [PDF]
, 1981 Pneumatic deicer boots for helicopter rotor blades were tested. The tests were conducted in the 6 by 9 ft icing research tunnel on a stationary section of a UH-IH helicopter main rotor blade.
Blaha, B. J., Evanich, P. L.
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Model helicopter rotor high-speed impulsive noise: Measured acoustics and blade pressures [PDF]
A 1/17-scale research model of the AH-1 series helicopter main rotor was tested. Model-rotor acoustic and simultaneous blade pressure data were recorded at high speeds where full-scale helicopter high-speed impulsive noise levels are known to be dominant.
Boxwell, D. A. +3 more
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An unsteady helicopter rotor: Fuselage interaction analysis [PDF]
A computational method was developed to treat unsteady aerodynamic interactions between a helicopter rotor, wake, and fuselage and between the main and tail rotors.
Egolf, T. Alan, Lorber, Peter F.
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