Results 231 to 240 of about 22,232 (271)

Tail Rotor Flapping

1999
Abstract : There was a letter in Feedback, September 1999 issue of Rotor & Wing entitled "Go-No-Go" from James D. Thomas, Jr. of Charleston, WV. The following description addresses my involvement with a Tail Rotor Flapping problem with the SH-3 Helicopter, now long since solved.
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Interactional Aerodynamics and Aeroacoustics of Helicopter Main-Rotor/Tail-Rotor and Main-Rotor/Fuselage [PDF]

, 1999
This paper address two problems of the helicopter flowfield: the aerodynamic and aeroacoustic interaction between a) the main- and the tail rotor and, b) between the main rotor and the fuselage. The first interaction is analyzed with a numerical approach;
Ahmed, S.R., Yin, J.
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Lynx Main Rotor/Tail Rotor Interactions: Mechanisms and Modelling

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 1994
A flight trial has been conducted by the Defence Research Agency (DRA) Bedford using a Lynx AH Mk5 helicopter fitted with an instrumented tail rotor to collect data on tail rotor aerodynamic performance. The analysis carried out to date has concentrated on the effects of main rotor wake interactions on the tail rotor. This paper describes the trial and
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Aeroacoustics Research in Europe: 5.1 Tail Rotor Noise Under Main/Tail Rotor Interaction [PDF]

, 2003
To demonstrate the effects of main rotor (MR) and tail rotor (TR) mutual interaction on the aerodynamics and noise characteristics, a BO105 MR/TR configuration is chosen in the numerical simulations.
Yin, J.
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Divergent Vibration in Helicopter Tail Rotors

SAE Technical Paper Series, 1965
<div class="htmlview paragraph">Helicopter tail rotors are subject to many types of divergent vibration. A classification of these various types is presented, and a description given of those which have been actually observed. The means used by manufacturers to predict and avoid such vibrations include various calculations in the design stage and
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Bearingless Tail Rotor Loads and Stability

1977
Abstract : Four wind tunnel model tests were conducted on a model flex-strap bearingless tail rotor was studied for aeroelastic stability characteristics and loads. In all, 12 individual rotor parameters were investigated to determine their effect on aeroelastic stability.
W. Miao, W. T. Edwards
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Orthogonal Blade-Vortex Interaction on a Helicopter Tail Rotor

AIAA Journal, 2008
The orthogonal blade-vortex interaction has been simulated using unsteady Reynolds-averaged Navier-Stokes equations with turbulence closure equations. The cases investigated are relative to an interaction between a lifting blade at a high angle of attack and an orthogonal vortex that travels either head-on or at 45 deg to the leading edge.
Filippone, Antonio; id_orcid 0000-0002-6512-6566, Afgan, Imran; id_orcid 0000-0002-8082-299X   +1 more
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Rotor Wake Study Near the Horizontal Tail of a T-Tail Configuration

Journal of Aircraft, 2002
Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of robust and accurate analytical design tools. To provide high-quality experimental data, a test program was conducted in the NASA Langley Research Center 14- by 22-Foot Subsonic Tunnel to measure the flow near the ...
Susan Althoff Gorton, John D. Berry, W. Todd Hodges, Deane G. Reis   +3 more
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The Technique of Centrifugal Load Loading on a Tail Rotor Shaft Fatigue Life Test [PDF]

Applied Mechanics and Materials, 2011
Tail Rotor Shaft (TRS) is a critical part in Helicopter Transmission System, and its loads are very complicated. This tail rotor shaft is made up of Hub and shaft, which incorporate structure design method used. During the flight, tail rotor shaft should
Li Sheng Lin
exaly   +2 more sources

A Comparative Study of Tail Rotor Noise Mechanisms

Journal of the American Helicopter Society, 1986
A study was made of helicopter tail rotor noise, particularly that due to interactions with the wakes of the main rotor, hub, and fuselage, and with the engine exhaust. Both harmonic and broadband noise were analyzed. The disturbed flow into the tail rotor was modeled using combinations of aerodynamic and acoustic flow codes along with some necessary ...
A. R. George, S. ‐T. Chou
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