Results 11 to 20 of about 12,334 (255)
Helicopter Tail Rotor Thrust and Main Rotor Wake Coupling in Crosswind Flight [PDF]
Journal of Aircraft, 2010 The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor system translating at a sideslip angle that causes the tail rotor to interact with the main rotor ...
Fletcher, Timothy M., Brown, Richard
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Main Rotor-Tail Rotor Interaction and Its Implications for Helicopter Directional Control [PDF]
Journal of the American Helicopter Society, 2008 Aerodynamic interference between the main and tail rotor can have a strong negative influence on the flight mechanics of a conventional helicopter. Significant unsteadiness in the tail rotor loading is encountered under certain flight conditions, but the character of the unsteadiness can depend on the direction of rotation of the tail rotor.
Fletcher, Timothy M., Brown, R.E.
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Aeroacoustic analysis of main rotor and tail rotor interaction [PDF]
, 2008 The increased restrictions placed on helicopter noise levels over recent decades have encouraged\ud manufacturers to better understand tail rotor noise and its aerodynamic sources. A\ud generic single main rotor and tail rotor helicopter has been simulated in high speed forward,\ud and quartering, flight using the Vorticity Transport Model.
Fletcher, T.M. +2 more
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Helicopter tail rotor orthogonal blade vortex interaction [PDF]
, 2004 The aerodynamic operating environment of the helicopter is particularly complex and, to some extent, dominated by the vortices trailed from the main and tail rotors. These vortices not only determine the form of the induced flow field but also interact
Marshall, J.S. +7 more
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Авіаційно-космічна техніка та технологія, 2021 Under certain conditions of a helicopter flight, the main rotor can exert a rather strong effect on the tail rotor, changing its traction and power characteristics.
Михайло Юрійович Кибальний +3 more
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Modelling the aerodynamics of coaxial helicopters : from an isolated rotor to a complete aircraft [PDF]
, 2008 This paper provides an overview of recent research on the aerodynamics of coaxial rotors at the Rotorcraft Aeromechanics Laboratory of the Glasgow University Rotorcraft Laboratories.
Brown, R.E. +5 more
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Configuration Study of Electric Helicopters for Urban Air Mobility
Aerospace, 2021 There is currently interest in the design of small electric vertical take-off and landing aircraft to alleviate ground traffic and congestion in major urban areas.
Julia A. Cole +4 more
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Wake dynamics and rotor-fuselage aerodynamic interactions [PDF]
, 2009 The unsteady loads experienced by a helicopter are known to be strongly influenced by aerodynamic interactions between the rotor and fuselage; these unsteady loads can lead to deficiencies in handling qualities and unacceptable vibratory characteristics ...
Brown, R.E., Kenyon, A.R.
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Научный вестник МГТУ ГА, 2018 The efficiency of the helicopter main rotor in the hover mode is very important, because this mode essentially determines the performance characteristics of the helicopter.
Y. M. Ignatkin +2 more
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Research on Calculation Method for Acoustic Scattering of Helicopter Noise
Xibei Gongye Daxue Xuebao, 2020 A new calculation method of helicopter rotor/fuselage acoustic scattering is developed. Firstly, a CFD analysis model is developed to simulate flow field of the rotor, which is based on the motional embedded grid system and RANS equations, and provides ...
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