By Al Adcock
Constructed as an alternative for the Douglas A-4, the A-7 Corsair II has noticeable strive against with either army and Air strength in Vietnam, Grenada and through Operation wasteland hurricane. contains 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 versions. Over a hundred images, forty element drawings, 2 pages of scale drawings, thirteen full-color drawings. 50 pages.
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9 shows the basic estimation steps in the form of a sketch and handwritten calculations on the back of an envelope. A detailed explanation of the assumptions and calculations follows. g. a star). They are assumed to be parallel, having come from an object at inﬁnity. The incoming rays reﬂect oﬀ the concave primary mirror and are directed by its curvature towards the on-axis focal point in accordance with the simple reﬂectance law in which the angle of incidence equals the angle of reﬂection. 9.
Each of the diﬀerent estimates is based on increasingly improved levels of knowledge regarding the magnitudes and the physics of the key system parameters. We use simple models for the Shuttle structures and for the thrust generating performance of the Shuttle’s rocket engines. On obtaining our ﬁrst crude solution we will examine the sensitivity of our results to diﬀerent input data and diﬀerent model reﬁnements. Although it may be a time-consuming process to obtain more detailed propulsion or structural information, it will improve the robustness of our physics model.
1 1:0 kg/m 3 2 ¼ ð250 m/sÞ ð2 Á 0:1 radiansÞð70 m Â 10 mÞ 4:0 2 ¼ 3:4 Â 10 6 N % 764,000 lbf Takeoﬀ mass estimate is then m¼ L 3:4 Â 10 6 N % ¼ 3:4 Â 10 5 kg g 10 m/s 2 Takeoﬀ thrust (4 engines) T4 engines ¼ maircraft Á aaverage % ð3:4 Â 10 5 kgÞð2:33 m/s 2 Þ ¼ 792,000 N ¼ 178,000 lbf 12 Introduction [Ch. 1 lists tabulated values of takeoﬀ thrust, units of lbf, for several diﬀerent versions of the 747. Note that the tabulated thrusts range from 46,500 lbf to 63,000 lbf depending on the engine manufacturer and the particular version of the aircraft.
A-7 Corsair II in Action No 120 by Al Adcock