Pomilio, Ottorino · New York, McGraw-Hill · leaf 103
SIGN AND CONSTRUCTION R of these pressures, may have any direction whatever.Let us resolve that resultant into three directions perpen-dicular to one another, the first in the sense of the Hne offlight, the second perpendicular to the line of flight andlying in the vertical plane passing through… … Fig. 73. If we wished to make a complete study of the motion of thebody in the air it would be necessary to know the values, of7?x, R5, and R\, for all the infinite number of orientationsthat the body could assume with respect to its line of path;practically, the most laborious research work of…
Airplanes
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