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 pictures, forty aspect drawings, three pages of scale drawings, thirteen colour work, 50 pages.
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Extra resources for A-20 Havoc in action No 144
Ll) 18 Introduction p+dp area A Fig. 12) so that if we find pressure in terms of temperature we can find it in terms of height. 13) where k is a constant of integration. 13) and use the fact that In ( p ) Taking exponentials we find 8 =-~P = 19 In (Po) = In (P/Po). 14) po COo) where 8 is known as the 'relative pressure'. 053 N m (kg K) -~ and h is given in km. 17) n is referred to as the 'polytropic index' for the atmosphere. 18) 20 Introduction where k is another constant of integration. 18) and taking exponentials gives P =exp - g-~ kt Now t5 = _LP = P .
8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000 Net thrust-Ib (a) Altitude 20 000 ft - ~ M,~No ' . o.. 0........... 55 O O o. 5 u) E, ~) ~, l ..... ~-J ~ v e i I -- _~ ~ ~ "" . . . . . 'w ] ............. 0,7 .... I . . . . m~ mrust & ..... 10,000 J. 12,000 14,000 Net thrust-Ib Fig. 16 Characteristics of a typical 70 000 Ib thrust turbofan engine (ISA) fitted with a propeller. oo (a) Shaft horse power [ 1 '= . . . . ,oo|1 ! I[I! l~-I[l Ii 1~ __L: D. e 800 (b) Propeller thrust .
84. 5 x 10 -5 kg N - ' s -I. 5675 and F Mop t 2 × 25 x 0 . 72. 6(a). Suppose an airliner is loaded to its full capacity with passengers, their baggage and freight and a small quantity of fuel; it can then take off but has to land immediately. 6(a). Adding more and more fuel then enables the aircraft to fly further and further up to the point B where the aircraft has reached its maximum take-off weight, which is fixed by the designer, bearing in mind such constraints as take-off requirements and stressing.