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Aviation History
1922
1922 - 0346.PDF
JUNE 15, 1922 CENTRE OF PRESSURE COEFFICIENTS FOR AEROFOILS AT HIGH SPEEDS* By W. S. DIEHL. IT has been customary to calculate the strength of the rear It can be shown that this assumption is not justified, regardless wing beam for the " high-speed " condition on the assumption of the utility of a "high-speed" condition ia strength that the centre of pressure was at 0.50 of the wing chord. calculations. re 8.0 a. a Speed factor -J^e* Z+ 26 28 Fig. 1 : Variation with speed of the centre of pressure of representative aerofoils. FIG.E. Cnard ^Mean Camber Fig. 2 : Diagram showing " Angle of Trail." In the course of an investigation of the C.P. movement for' a series of aerofoils, it was found that the C.P. moves rearward more or less uniformly with increase in speed. This is shown in Fig. 1, in which the C.P. data for a number of notable aerofoils are plotted against the speed factor (JLmaxjCL- It will also be noted that there is a wide variation in the C.P. * Technical Note No. 25 oi American National Advisory Committee for Aeronautics. Fig. 3 : Centre of pressure variation with speed and angle of trail. GQttingen aerofoils.
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