SIMULATION OF HELICOPTER AND V/STOL AIRCRAFT., VOLUME I: HELICOPTER ANALYSIS REPORT,
MELPAR INC FALLS CHURCH VA
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The objective of the report is to present the aerodynamic and dynamic helicopter equations supported by derivations and a comprehensive discussion. The aerodynamic equations are developed through a modified blade element approach although other alternative techniques are considered. The equations are not constrained to a given, or a number of given, flight conditions but are valid for the entire flight regime including hover, transition, autorotation, the effects of varying altitude, ground effects, and blade aeroelasticity in twist. The dynamic derivation develops a set of unabridged and simplified equations of translational and angular rates specifically for a tandemrotor helicopter. The dynamic and aerodynamic effects on the helicopter rotor are combined to produce equations to describe blade acceleration, velocity, and position, while flapping, at chosen points during a rotation. A technique is also presented for greatly simplifying the simulation of a tandem-rotor helicopter which eliminates the necessity of construction detailed, identical mathematical models for the two rotors.