Results 141 to 150 of about 1,267 (185)
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Transonic Aerodynamics and the Helicopter Rotor
1976The fact that helicopter rotors encounter transonic aerodynamic flow problems has been recognised for several years, and with this realisation there has been considerable activity in recent years in the study of ways of improving rotor performance through blade section and tip design [1–12].
P. G. Wilby, J. Grant
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The Control of Helicopter Rotor Vibration
The Journal of the Helicopter Association of Great Britain, 1956The Chairman said the subject was of paramount importance to all helicopter designers, manufacturers and operators The Association had not previously had a lecture which dealt specifically with the problem and the importance of the subject meant that such a lecture was long overdue They knew that, in spite of the claims made from time to time by sundry
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First Helicopters and Rotor Systems
2004Until 1936 when the first helicopter Fw 61 of Focke Wulf came to fly, many inventers and designers tried to develop a practicable helicopter. But the designers failed due to the lack of scientific and technological knowledge so that their devices showed a very unstable flight behaviour and could hardly leave the vicinity of the airport.
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The Stiff‐hinged Helicopter Rotor
Aircraft Engineering and Aerospace Technology, 1955THE continual development of helicopter rotor systems has so far resulted in the use of about six main types, and it will be of value briefly to recapitulate their advantages and disadvantages in order to obtain a balanced picture against which the stiff‐hinged rotor can be judged.
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Stability Derivatives of Helicopter Rotors
1938At present there are only three published papers dealing with the stability of helicopters, all based on helicopters with rigid rotors. Since all rotors are, in practice, constructed with the blades free to "flap", these analyses are not sufficiently general.
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Development and dynamics of a 2SPU+UPU+SP parallel rotor of helicopter
Aerospace Science and Technology, 2021, Nijiareborn Ye
exaly
Tandem Rotor Helicopter Control
2018In this chapter, we study the dynamic analysis and control design for the tandem rotor 3-DOF helicopter platform. We utilized the MATLAB/Simulink software to integrate with the Quarc software for the control system. The system mimics a Chinook helicopter, of which the build consists of a base to which an arm is mounted, two motor-driven propellers ...
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Manufacturing and Testing of a Variable Chord Extension for Helicopter Rotor Blades
Actuators, 2022Andres Rivero +2 more
exaly
Description of a Dynamical Framework to Analyse the Helicopter Tail Rotor
Dynamics, 2021Salvador Castillo-Rivera +1 more
exaly
Simulation of a Helicopter Rotor
Journal of the American Helicopter Society, 1959W. G. Heffron +3 more
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