Results 1 to 10 of about 64,260 (282)
Data-driven analysis and new findings on the loss of tail rotor effectiveness in helicopter accidents [PDF]
Scientific Reports, 2022 Loss of tail rotor effectiveness (LTE) is an unstable dynamic phenomenon that affects single-rotor helicopters and frequently leads to accidents. LTE accidents recur with troubling regularity and show no sign of abatement.
Joseph Homer Saleh +5 more
doaj +2 more sources
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
openaire +4 more sources
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.
openaire +4 more sources
Variable-speed tail rotors for helicopters with variable-speed main rotors [PDF]
The Aeronautical Journal, 2017 ABSTRACTVariable tail rotor speed is investigated as a method for reducing tail rotor power, and improving helicopter performance. A helicopter model able to predict the main rotor and tail rotor powers is presented, and the flight test data of the UH-60A helicopter is used for validation. The predictions of the main and tail rotor powers are generally
Han, D., Barakos, G.N.
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Main Rotor Wake Interference Effects on Tail Rotor Thrust in Crosswind
International Journal of Aerospace Engineering, 2021 Reverse pedal operational property in front crosswind flight condition is a potential hazard for accidents involving loss of tail rotor effectiveness (LTE), which is closely related to the main rotor (MR) wake interference on the tail rotor (TR).
Chang Wang +4 more
doaj +2 more sources
Simulation of Tail Boom Vibrations Using Main Rotor-Fuselage Computational Fluid Dynamics (CFD) [PDF]
Applied Sciences, 2017 In this work, fully-resolved rotor-fuselage interactional aerodynamics is used as the forcing term in a model based on the Euler-Bernoulli equation, aiming to simulate helicopter tail-boom vibration.
Andrey Batrakov +4 more
doaj +4 more sources
Generator configuration for helicopter quadruplex electric tail rotor [PDF]
The Journal of Engineering, 2019 With the move to more electric aircraft (MEA), a key area of investigation is the development of commercially viable systems which are reliable, efficient, low mass, and are compatible and commensurate with the power and multiplex requirements of current
Julian D. Booker +3 more
doaj +4 more sources
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
openaire +4 more sources
Methods for Attenuation of Helicopter [PDF]
فناوری در مهندسی هوافضا, 2023 Helicopters can be a source of loud noise. The high production noise of helicopters makes them unsuitable for densely populated areas, especially in low-flying conditions.
Hamid Parhizkar +2 more
doaj +1 more source
Fracture fault analysis of tail rotor on a helicopter
Hangkong gongcheng jinzhan, 2023 Finding out the reason of the fracture fault of tail rotor on a helicopter is of practical significance for using and maintaining the helicopter and is of significant reference for improving safety of new type helicopter. The fracture fault of tail rotor
HOU Bo +3 more
doaj +1 more source