A Method of Estimating Helicopter Performance: The Calculation of an Estimated Performance at the Project Stage Available to Purchase

Based fundamentally on the ‘Energy Method’ approach to helicopter performance calculation, a method is presented for calculating performance of a design in the project stage. In another form, less suitable for project work, the equations have been used for performance estimation by the writer for several years. They were found to give better agreement with flight test and rotor tower results than any other method tried. It is believed that the method gives quicker and more accurate results for project work than any so far developed.