Results 91 to 100 of about 30,315 (234)
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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Lifting surface theory for a helicopter rotor in forward flight [PDF]
, 1984 A lifting surface theory was developed for a helicopter rotor in forward flight for compressible and incompressible flow. The method utilizes the concept of the linearized acceleration potential and makes use of the vortex lattice procedure. Calculations
Runyan, H. L., Tai, H.
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INTERFERENCE BETWEEN HELICOPTER AND ITS SURROUNDINGS, EXPERIMENTAL AND NUMERICAL ANALYSIS
TASK Quarterly, 2009 The paper describes the phenomenon of the occurrence of aerodynamic interference between a helicopter and an object in its near vicinity. Such situations occur during rescue missions as well as during police and military operations when the helicopter ...
TOMASZ ŁUSIAK +2 more
doaj
Research of the crosswind effect on the single-rotor helicopter unintentional yaw rotation
Научный вестник МГТУ ГАDuring the operation of single-rotor helicopters, aviation accidents quite frequently occur in the form of an unintentional turn or even a yaw rotation, causing, as a rule, a ground collision.
V. V. Efimov +2 more
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Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor [PDF]
The reduction of high speed impulsive noise for the UH-1H helicopter was investigated by using an advanced main rotor system. The advanced rotor system had a tapered blade planform compared with the rectangular planform of the standard rotor system ...
Conner, D. A., Hoad, D. R.
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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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The UH-1H helicopter icing flight test program: An overview [PDF]
An ongoing joint NASA/Army program to study the effects of ice accretion on unprotected helicopter rotor aerodynamic performance is discussed. This program integrates flight testing, wind tunnel testing, and analytical modeling. Results are discussed for
Richter, G. P., Shaw, R. J.
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The effectiveness of the EPNL procedure in quantifying helicopter blade slap and tail rotor noise heard on approach some distance from the flyover position is addressed.
Leverton, J. W. +2 more
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Development of an aeroelastic stability boundary for a rotor in autorotation [PDF]
, 2008 <p>For the present study, a mathematical model AMRA was created to simulate the aeroelastic behaviour of a rotor during autorotation. Our model: Aeroelastic Model of a Rotor in Autorotation (AMRA) captures transverse bending and teeter ...
Gillies, E.A. +2 more
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