Analytical Calculations of Helicopter Torque Coefficient (CQ) and Thrust Coefficient (CT) Values for the Helicopter Performance (HELPE) Model

Report No. ARL-TR-1986
Authors: Kim, Ki C.
Date/Pages: June 1999; 29 pages
Abstract: A computer program for calculating helicopter torque coefficients (CQ) and thrust coefficients (CT) as a function of a vehicle's forward speed has been developed in conjunction with the helicopter performance assessment project. The model is based on the energy principle, in which helicopter power is broken into three components: induced power, profile power, and parasite power. This report documents the basic mathematical model used in the code, along with the numerical solution scheme used in implementing the model. Results are calculated for the UH-60A Black Hawk helicopter for hover and different forward speed settings and correlated with existing flight test data. The effects of different disk loading on helicopter power requirements are also investigated. The present model agrees reasonably well with the flight test data, providing the author with a certain confidence in the helicopter aerodynamic model developed in the present study.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 1999