Results 241 to 250 of about 64,260 (282)
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Rotor Wake Study Near the Horizontal Tail of a T-Tail Configuration
Journal of Aircraft, 2002Development 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 +3 more
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Design parameters improvement of helicopter ducted tail rotor
Aircraft Engineering and Aerospace Technology, 2018Purpose The purpose of this paper is to reduce the acoustic noise of helicopter ducted tail rotor. Design/methodology/approach To predict the noise accurately, a thin-body boundary element method (BEM)/Ffowcs Williams–Hawkings method is developed in this paper.
Guo Zhong, Jun Huang, Mingxu Yi
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A Comparative Study of Tail Rotor Noise Mechanisms
Journal of the American Helicopter Society, 1986A 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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S-76D™ Tail Rotor Ice Impact Test
SAE Technical Paper Series, 2011<div class="section abstract"><div class="htmlview paragraph">This paper presents the test method and results from ice impact testing conducted on representative S-76D™ Helicopter Tail Rotor (TR) blade and TR control system assemblies. Full scale ice impact tests on the leading edge of the tail rotor blade paddle, pitch links, and a pitch ...
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Elastic Pitch Beam Tail Rotor Operational Suitability Investigation
1974Abstract : Work was performed to ascertain the operational suitability of the 6Elastic Pitch Beam Tail Rotor6 and to select an optimized coating system and leading edge erosion guard. The five basic tasks performed are the following: (1) protective coating for the glass reinforced plastic spar (GRP). (2) Elastic pitch beam spring rate.
Paul Maloney +2 more
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Solid Lubricants for Helicopter Tail Rotor Gearboxes
1970Abstract : Solid lubricants as retainers in rolling bearings and as idlers for load gearswere evaluated in a Bell UH-1 helicopter tail rotor drive gearbox under normallubricated conditions and also under emergency conditions of dry operation.Solid lubricants provided satisfactory gearbox operation using conventionalfluid lubrication in all tests at ...
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Roles of mRNA poly(A) tails in regulation of eukaryotic gene expression
Nature Reviews Molecular Cell Biology, 2021Lori Anne Passmore, Jeff Coller
exaly
Aeroacoustic investigation of a ducted tail rotor
AIAA AVIATION 2023 Forum, 2023Prateek Jaiswal +4 more
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New Generation Electric Tail Rotor Performance Analyses
2023 10th International Conference on Recent Advances in Air and Space Technologies (RAST), 2023Onur Açar +2 more
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Tail Rotor Design Part I: Aerodynamics
Journal of the American Helicopter Society, 1970R. R. Lynn +3 more
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