LIST OF SYMBOLS USED IN PART II 



THE following symbols occur frequently in Part II. and are then always used 

 with the meanings given below. When used in Part I., however, they have 

 not invariably the meanings here given : such cases, however, are clear from 

 the context. 



Other symbols used in Part II. are not always of invariable meaning, but 

 they are defined as they occur and no trouble should result. 



L/D . J^L. 



Drag 



P Horse- power required for horizontal flight. 



P' Ditto at an altitude. 



P P Whichever is the less of P T and P R . 



P P ' . . . Whichever is the less of P T ' and P R '. 



PR . . Propeller horse-power at full revolutions. 



P R ' . . . Ditto at an altitude. 



P T Propeller horse-power with throttle full open. 



P T ' . . . Ditto at an altitude. 



R Body resistance in pounds at 100 m.p.h. 



R : Part of R in slip-stream. 



R 2 Part of R outside slip-stream. 



S Wing area in square feet. 



S' Part of S in slip-stream. 



V ... Speed in m.p.h. 



V ... Ditto at an altitude. 



W Total weight of machine in pounds : it is the same as W 



except in cruising calculations. 



W . . . Starting total weight of machine in pounds. 



d Propeller diameter in inches. 



k c Centre of pressure coefficient. 



L Lift coefficient. 

 k^ max. Maximum value of L . 



p . . . -161 for stationary engines and -262 for rotary engines. 



q -839 for stationary engines and 738 for rotary engines. 



X ... kjk^max. 



<r Density of air relative to standard. 



