(41C) Helicopter Performance Prediction, tandem-rotor

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An extract from Computer Program for Performance Prediction of Tandem-Rotor Helicopters, Master's Thesis (Engineer's Thesis), Naval Postgraduate School, June 1985, 41 pgs.

"ABSTRACT
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 parameters and flight conditions. Three simplified analytical methods of calculating the induced power for tandem-rotor helicopters 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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APPENDIX B
HP-41 COMPUTER PROGRAM
TANPWR
Tandem-Rotor Helicopter Power Required
Introduction: This program determines the steady state power requirements for a tandem-rotor helicopter. Basic geometric and flight parameters of the helicopter are inputs to the program and the total rotor shaft horsepower required is the output. Other results can be viewed by recalling the appropriate storage registers."

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