By Ernest R. McDowell, Don Greer
Few airplane designs have had as strange or advanced a historical past because the P-40 sequence. actually one wonders why the Air Corps elected to provide the H-75P a designation except a splash quantity within the P-36 sequence because it used to be essentially a re-engined P-36A. Spin-offs from the P-36 layout may consequence not just within the P-40 however the XP-37, XP-42, XP-46, XP-53, XP-60, and XP-62 plus those given Y designations and numerous sprint numbers.
Ignoring the Curtiss Hawk biplanes, the genealogy of the P-40 would appear to have its faucet roots within the XP-934 Curtiss quick of 1932 classic. even though a few event within the low-wing monoplane style used to be received while the corporate produced its famed Shrike sequence of assault planes, the speedy, or XP-31 because it was once specific through the Air Corps, was once their first low-wing pursuit layout. by way of a kind of ordinary quirks, the rapid at the beginning used to be powered by way of an in-line engine which gave method to a extra strong radial, simply the opposite of the P-36 to P-40 layout improvement. The XP-31 used to be now not profitable with both engine and the layout was once quickly deserted (It did earn the doubtful contrast of being the final U.S. pursuit aircraft with a set touchdown gear). The Curtiss Company's fortunes took a downward flip within the pursuit box while the Boeing P-26A used to be chosen by way of the Air Corps over the XP-31.
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Additional resources for Curtiss P-40 in Action
F. Flugtechnik u. , 1932. 2* J 1. GENERAL PROPERTIES OF THE WING 20 values, revealed a relation between 6. CL and CD as shown in Fig. 18 for two airfoils of equal mean curvature. On the whole the curves lie symmetrically about a curved mean line whose shape depends upon the airfoil curvature; this mean line for symmetrical cross-sections is straight and coincides with the CD axis. If the formation of a turbulent wake diminishes the lift, the question arises, does this alteration shift also the lift center of pressure, and if so, to what extent ~ On comparing gOr---------~----------.
R::2n(7. 2)] and thus acting at a distance of c/4 from the front edge (Fig. 32). The force resulting from these two components is given by OL = OL~ OL(1. 7) Its point of application is at c/2 when (7. = 0; it approaches c/4 as IY. increases and for negative values of IY. shifts to the right toward co, which it reaches for IY. = - ()/4 with OL = O. The moment about the front edge is accordingly + OM R:: ; sin ( (7. + ~) R::; (sin (7. o for the flat plate with the same angle of ~(}X incidence. ; the position of least profile drag therefore moves toward larger values of 0 L as the curvature increases.
39. Characteristic parabola for a profile. is exact and not merely approximate. Every cross-section has a point about which the moment of the lift forces is constant, i. , independent of the angle of incidence. The lines of action of the lift forces form the envelop of a parabola whose focus is the point about which the moment is constant 3 (Fig. 39, focus F). Since the lift acts perpendicularly to the direction of flow and since each direction gives only one tangent to the parabola, it follows that if the parabola is known, the direction and line of application (but not the magnitude) of the lift force in every direction of flow, i.
Curtiss P-40 in Action by Ernest R. McDowell, Don Greer