THE 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.
Payne, P.R. (1955), "The Stiff‐hinged Helicopter Rotor: A New Form of Rotor Giving Improved Performance and Stability", Aircraft Engineering and Aerospace Technology, Vol. 27 No. 11, pp. 358-370. https://doi.org/10.1108/eb032621Download as .RIS
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