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

By Jim Mesko, Joe Sewell, Don Greer

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

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36. ) The structure of this flow is illustrated in Fig. 37. Downstream of separation point S is a recirculating ‘bubble’ flow bounded by a dividing streamline (S), which separates the recirculating flow from the flow streaming from upstream to downstream ‘infinity’. The streamline (S) originates at separation point S and ends at reattachment point R. Due to the action of the strong mixing taking place in the detached shear layer emanating from S, a mechanical-energy transfer occurs from the outer high-speed flow towards the separated region.

Physical plane. 18 Physical Introduction energy equation written with the specific entropy as variable is as follows: ρT ds ∂ui , = τi j dt ∂ xi where τi j is the stress tensor and d/dt is the total (particular) derivative. This equation shows that the only source of entropy is viscosity through the shear stresses. These relationships establish the link among drag, entropy, and viscosity. Because viscosity is active in regions of rapid velocity variation, the origin of drag is found in either the discontinuities such as shock waves and slip lines or the regions close to body surfaces – namely, the boundary layers – that constitute special slip lines.

The images of flows (2) and (3) are points (2) and (3) situated on polar ( 1 ) attached to upstream flow (1). Shocks (C3 )and (C4 ) are represented by polars ( 2 ) and ( 3 ) attached to flows (2) and (3), respectively. To equalise the pressures and flow directions, the images of states (5) and (4) must coincide with the intersection of ( 2 ) and ( 3 ). In the general case, shocks (C1 ) and (C2 ) do not have the same intensity; therefore, the increases in entropy across (C1 ) + (C3 ) and (C2 ) + (C4 ) are different.

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