Non-dimensional approach to engine thrust and airframe drag for the analysis of measured performance data: aircraft with turbo-jet and turbo-fan engines.
ESDU 70020 outlines the method by which the engine and airframe characteristics used in the measurement and calculation of aircraft performance may be expressed in terms of a few non-dimensional parameters and indicates the limitations of such a method. Various additional factors (Reynolds number@ thrust angle@ centre of gravity variation@ power plant operation@ gravity variation@ flight path length@ buoyancy) that affect the analysis of measured performance are discussed and methods by which they may be taken into account in applying this approach are indicated.