A-7 Corsair II in Action No 120 by Al Adcock

By Al Adcock

Constructed as an alternative for the Douglas A-4, the A-7 Corsair II has obvious wrestle with either army and Air strength in Vietnam, Grenada and through Operation barren region typhoon. comprises the A-7A, A-7P, A-7B, A-7C, NA-7C, TA-7C, EA-7L, YA-7H, A-7D, A-7E, A-7G, A-7H, YA-7F, and A-7K editions. Over a hundred images, forty element drawings, 2 pages of scale drawings, thirteen full-color drawings. 50 pages.

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Suppose that c is some property of the fluid and we visualize a field of values of c continuously distributed throughout space. For small arbitrary and independent increments dx, dy, dz, and time, dt, the change in property c is dc = ∂c ∂c ∂c ∂c dx + dy + dz + dt. 2) where ux , uy , and uz are velocity components in the three spatial directions. Dividing each term by dt, the rate of change of c following a fluid particle can be written as rate of change of c following a fluid particle = Dc ∂c ∂c ∂c ∂c = ux + uy + uz + .

The shear force per unit area (or shear stress) on this surface acting in the x2 -direction is 12 , and that in the x3 -direction is 13 , with similar notation for the other faces. 1) with similar equations for the x2 - and x3 -directions. The ratios of the face areas, dA1 /dA, dA2 /dA, dA3 /dA, however, are just the three components of the direction cosines of the normal to the slant side. e. 2b) F3 = 13 n 1 + 23 n 2 + 33 n 3 . 2c) In general, to specify the surface stress nine numbers, ij , would be needed because there are different components for different orientations of the plane.

10 Splitting the energy equation or 1 Dp 1 ∂qi 1 ∂u i Dh = Q˙ + − + τij . 19), dh = Tds + (1/ρ)∂ p, holds for all small changes. It can thus be written to express the entropy changes experienced by a fluid particle: T Dh 1 Dp Ds = − . 3) gives an expression for the rate of change of entropy per unit mass: T 1 ∂qi Ds 1 ∂u i = Q˙ − + τij . 5) The entropy of a fluid particle can be changed by heat addition, either from heat sources or heat flux (qi ), or by shear forces. Pressure forces and body forces have no effect.

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