, 1978 A low-friction, axially extensible strut, automatically lockable in both tension and compression, for use as a secondary load path in helicopter main rotor force measurement systems is ...
Bonisch, F. H.
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A flight dynamics investigation of compound helicopter configurations [PDF]
, 2013 Compounding has often been proposed as a method to increase the maximum speed of the helicopter. There are two common types of compounding known as wing and thrust compounding.
Ferguson, K., Thomson, D.
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The cost of applying current helicopter external noise reduction methods while maintaining realistic vehicle performance [PDF]
Analytical methods were developed and/or adopted for calculating helicopter component noise, and these methods were incorporated into a unified total vehicle noise calculation model.
Bowes, M. A.
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A method for determining the characteristic functions associated with the aeroelastic instabilities of helicopter rotors in forward flight [PDF]
Computer program for determining characteristic functions of aeroelastic instabilities of helicopter rotor in forward ...
Piarulli, V. J., White, R. P., Jr.
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Helicopter Anti-Torque System Using Strakes [PDF]
A helicopter is disclosed with a system for controlling main-rotor torque which reduces the power and size requirements of conventional anti-torque means. The torque countering forces are generated by disrupting the main rotor downwash flowing around the
Kelley, H. L. +2 more
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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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The effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability. Part 2 - Computer program listing [PDF]
Computer program for calculating effects of swash-plate stiffness on helicopter rotor system dynamics and ...
Piarulli, V. J.
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A computer program for the determination of the acoustic pressure signature of helicopter rotors due to blade thickness [PDF]
A computer program is presented for the determination of the thickness noise of helicopter rotors. The results were obtained in the form of an acoutic pressure time history.
Farassat, F., Mall, G. H.
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Engine/airframe interface dynamics experience [PDF]
Problems of engine/drive system torsional stability, engine and output shaft critical speeds, and engine vibration at helicopter rotor order frequencies are discussed, and test data and analyses presented.
Fredrickson, C.
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A real-time digital computer program for the simulation of a single rotor helicopter [PDF]
A computer program was developed for the study of a single-rotor helicopter on the Langley Research Center real-time digital simulation system. Descriptions of helicopter equations and data, program subroutines (including flow charts and listings), real ...
Gibson, L. H. +2 more
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