By Ernest R. McDowell, Don Greer
Few plane designs have had as ordinary 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 touch quantity within the P-36 sequence because it was once primarily a re-engined P-36A. Spin-offs from the P-36 layout might end result 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 diverse 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 if 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 fast, or XP-31 because it was once detailed by way of the Air Corps, used to be their first low-wing pursuit layout. by means of a kind of extraordinary quirks, the quick in the beginning was once powered via an in-line engine which gave solution to a extra strong radial, simply the opposite of the P-36 to P-40 layout improvement. The XP-31 used to be no longer profitable with both engine and the layout was once quickly deserted (It did earn the doubtful contrast of being the final U.S. pursuit airplane with a set touchdown gear). The Curtiss Company's fortunes took a downward flip within the pursuit box while the Boeing P-26A was once chosen by way of the Air Corps over the XP-31.
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Additional info for Curtiss P-40 in Action
Strong concentrations of the trailing vortices are obtained whenever a large span wise variation of lift occurs. Consequently the sections are operating in a curved as well as a rotated flow field whenever the spanwise variation of lift is not small. This curved flowfield may be interpreted as an effective change in camber which is not considered in ordinary liftingline theories. This difficulty is avoided by lifting-surface theory, the treatment of which is outside the scope of this volume. Experience has shown that usable results are obtained from lifting-line theory if no spanwise discontinuities or rapid changes of section, chord, or twist are present, and if the wing has no pronounced sweep.
29. The velocity distribution about the cylinder is found by differentiating the expression for the stream function [Eq. 29)] as follows: 2 . iNt a ) sm8+r - = V ( 1+ar r2, 27rr 45 SIMPLE TWO-DIMENSIONAL FWWS The tangential component of velocity v' (positive counterclockwise) at the surface of the cylinder is obtained from Eq. 9) and the substitution of r = a. 5) along the streamline If = o. 32) the pressure coefficient S [Eq. 33) The symmetry of Eq. 33) about the line 8 = 1r/2 shows that there can be no drag force.
It was shown in Chap. 2 that the field of flow about a circular cylinder with circulation in a uniform stream is known. It is possible to relate this field of flow to that about an arbitrary wing section by means of conformal mapping. In relating these fields of flow, the circulation is selected to satisfy the Kutta condition that the velocity at the trailing edge of the section must be finite. Such characteristics as the lift and pressure distribution may then be determined from the known flow about the circular cylinder.
Curtiss P-40 in Action by Ernest R. McDowell, Don Greer