The phenomenon known as 'air resonance', peculiar to helicopters with hingeless rotors, has been analysed and presented in as simple a manner as possible. In the air resonance case the 'body mode' with frequency close to ...
The equations of motion of the helicopter are presented and reduced to non-dimensional form. The force and moment derivatives for the single-rotor helicopter (including tailplane if required) are given as simple formulae ...
Part 1. A simple method of calculating downwash interference is presented and comparison of theoretical and flight test trim curves indicates that the method is reasonably accurate. Since the stability of the tandem-rotor ...
The Report presents a theory of the aerodynamic interference between a helicopter rotor blade and a fuselage or wing. A two-dimensional analysis is made to which a correction factor is applied to convert the two-dimensional ...