A general discussion is presented herein, to outline the starter functions which are necessary for a successful engine start. calculations are included to illustrate an accepted method of determining the engine starting time from known data. Further consideration is then given to the relationship between starter torque output and engine pad strength and a generalized formula is presented for calculating the theoretical transient torque peaks for a simplified starter-engine system. Sample calculations for actual tests are included.

PURPOSE:

The purpose of this report is to provide a general guide to the factors utilized and methods employed in determining turbine starter torque and engine pad strength requirments.