THIS paper tells how to obtain and evaluate maximum speed of airplanes in level flight.
Relationship between available thrust horsepower and powers required to overcome both induced and non-induced resistances is given, in order to provide a clearer understanding of the items affecting maximum speed and the various ways of evaluating changes in that speed.
Maintenance of a constant density altitude in combination with a constant engine power or airplane speed is most satisfactory, the authors show.
Charts enabling a pilot to attain these conditions in flight are given, together with a method of manifold-pressure calibration of the engine and the use of such calibration in determining the engine power in flight.
