By Dana Bell
Air strength shades Vol 1: 1926-42
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Extra info for Air Force Colors 1926-1942
The air stopped per second is contained in a column of length V, cross-section >S and volume V X S. ; The mass of this air is VXSx p, and its momentum is V times the THE PROFILE OF THE WING mass, that volume. is, p x F x 2 S, where p is 31 the density or mass per unit of According to Newton's second law of motion, the force F on the plate should be equal to the momentum stopped by the plate per unit of time, that is, F = pV'2 S. In fact, the air is not completely stopped 2 so the that the is less than pV S force how much less may by plate, THE PHYSICS OF FLIGHT 32 be found by actual experiments only.
P. travels forward rapidly. At 10 it is found at 30 per cent from the leading edge, where it remains rather stable when a increases to the stalling angle of 22. THE PROFILE OF THE WING customary also to plot a curve It is moment pitching for various angles a: 41 for the coefficient CM as a fifth characteristic. significance of these curves for the stability and airplane in flight will be discussed in Chapters IV performance of the The of the and V. Correction for Aspect Ratio 16. characteristic curves for CL, C D and for the ratio L/D depend the shape (not size) of the wing profile, and to a certain degree also The , on on the span /chord ratio (aspect ratio, AR).
Propeller axis and wing chord built into the In this case we have the general relation : a-8-t-a'. The velocity of level flight under where C'L is minimum horizontal thrust then V = VWipS^I for minimum thrust and 9 = 0, the value of the wing coefficient of the lift V for is a - a '. is obtained when the factor C L flight at higher speed than denominator under the square root has a value smaller than C'L This is achieved by decreasing a to a value smaller than a', which means Level in the . decreasing 6 to negative values, so that the propeller axis is tilted downward slightly.