Computer program for performance prediction of tandem-rotor helicopters
Cotner, Dave L.
Layton, D. M.
Healey, J. V.
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A computer program for the HP-41 series calculator is presented which predicts the rotor shaft horsepower required for tandem-rotor helicopters to a given set of helicopter parametrics and flight conditions. Three simplified analytical methods of calculating the induced power for tandem-rotor helicoptes were explored during the development of the program and their effect on the total shaft horsepower required was compared to actual test data. These comparisons as well as size and complexity considerations were used in selecting the best method to be used. The program can be used in preliminary design analysis and as an educational tool where only an estimate of the actual shaft horsepower is required.
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