A-20 Havoc in action No 144 by Jim Mesko, Joe Sewell, Don Greer

By Jim Mesko, Joe Sewell, Don Greer

Constructed out of the DB-7 sequence of sunshine bombers. A-20s, Havocs & DB-7s observed motion in virtually each significant theatre of operation in the course of WWII. Used as a gentle bomber, flooring strafer & nightfighter. Over a hundred pictures, forty aspect drawings, three pages of scale drawings, thirteen colour work, 50 pages.

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The rightmost figure shows the typical use of image singularities to represent the effect of a solid wall boundary. 10: Sources within an incompressible flow-field are not permitted by continuity. Fictitious sources inside a body, on a boundary, or outside the physical flow-field are permissible. 2 Sources in compressible flow In a compressible flow, with significant density variations, the source distribution σ within the flow-field will in general be nonzero. 33). 58) Hence, σ is nonzero wherever the density gradient has a component along the velocity vector.

Integral momentum equation Similarly, the law of conservation of momentum, or equivalently Newton’s Third Law, asserts that the time rate of change of the total momentum in the volume, plus the net momentum outflow rate through the surface of the volume, must sum to the total force acting on the interior and the surface of the volume. 28) Integral energy and enthalpy equations The law of conservation of energy, or equivalently the First Law of Thermodynamics, asserts that the time rate of change of total energy, plus its net outflow rate, equals the sum of heat and work sources q˙V + w˙ V in the interior, plus heat inflow and work −q˙S + w˙ S at the boundary.

5 m, and the freestream velocity Vref = V∞ = 10 m/s. Using non-dimensional variables is equivalent to using natural units. 1: Physical parameters, or scales, of aerodynamic flows. Scales in bottom block are relevant only for compressible flows. Units are: length l, time t, mass m, temperature θ. 1 because for ideal gases these are effectively redundant. Specifically, they can be defined from the other scales via the ideal-gas, speed of sound, and caloric relations. 44) a2ref /cp Chapter 1 10 Such derived-scale definitions only need to have the same dimensions.

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