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Unformatted text preview: In this condition Hence, from (F1), From (F2), From (F3), 5.2 (see example 5.6) Use the expression for “q” from class notes “FillIns” or eqn. (5.50) . For a jet engine , the thrust varies proportional to density as indicated in the class notes and by eqn. (3.19). Eqn (5.50), written in more compact form, as in class notes, is . The available thrust T at sea level (density ρ = 0.002377 slug.ft3 ) is 202 lb. The available thrust at 10,000 ft (density = 0.0017556 slug.ft3 ) is With these values substituted, one obtains at sea level, and . 5.3 Eqn(5.43) yields, which in turn yields Since velocity in cruise flight is use of Eqn.(5.44) results in 5.5 The relevant parameters are: b) c) and d) Velocity Expression Sea level 10,000 ft 194 ft/sec 255.3 ft/sec 225.7 ft/sec 297 ft/sec...
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 Spring '08
 Yousuff
 Aerospace Engineering, Aerodynamics, Oswald efficiency number, Jet aircraft

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