By Ernest R. McDowell, Don Greer
Few airplane designs have had as strange or complicated a history because the P-40 sequence. actually one wonders why the Air Corps elected to offer the H-75P a designation except a splash quantity within the P-36 sequence because it was once essentially a re-engined P-36A. Spin-offs from the P-36 layout could 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 rapid of 1932 classic. even though a few adventure within the low-wing monoplane sort was once received whilst the corporate produced its famed Shrike sequence of assault planes, the speedy, or XP-31 because it used to be specified via the Air Corps, was once their first low-wing pursuit layout. by way of a kind of abnormal quirks, the fast in the beginning used to be powered through an in-line engine which gave technique 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 hard and fast 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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Associate Professor, Chemistry Department. 37 38 B. 2 in order to accurately determine the heating diffusion, and viscous flow rates at the surface of an entry vehicle, good estimates of the transport properties are needed. The purpose of this paper is to report reliable estimates of the transport properties of importance in determining these rates during entry into Titan's atmosphere. The kinetic theory of gases has been used to calculate the transport properties. Two-Body Interaction Potentials In order to use the kinetic theory of gases, it is necessary to know the two-body interaction potentials between the various species in the atmosphere.
1, 1972, pp. 4038-4042. 27 Hellemens, J. , and Ro, S. , "The Viscosity of Oxygen and of Some of Its Mixtures with Other Gases," Physica, Vol. 65, April 15, 1973, pp. 362-375. po Hellemens, J. , and Ro, S. , "The Viscosity of CH4, CF4, and SFs Over a Range of Temperatures," Physica, Vol. 65, April 15, 1973, pp. 376-380. , Khalifa, H. , Ro, S. , and Wakeham, W. , "The Viscosity and Binary Diffusion Coefficients of Eighteen Binary Gaseous Systems," Physica, Vol. 88A, Aug. 1977, pp. 242-260. Esch, D.
4-11) and preceding discussion, are available. The molecular states, reduced H-H potential parameters, and type classifications are listed in Table 1. Mote that the r- T Lt 9 n , O 1_ _ _ A , and £~ states are predicted to have long- range maxima and second minima. Such features have been predicted previously from quantum-mechanical calculations' 6 for the ^ and ^^ states. C. RAINWATER ETAL. 1931 Type 1 1 1 1 2 1 1 1 1 5 5 4 5 The transport collision integrals for all the above potentials are required for calculation of transport properties of both pure gaseous monatomic carbon and gaseous mixtures containing monatomic carbon.