MEM425F11_HW5-1.soln

MEM425F11_HW5-1.soln - MEM 425 Aircraft...

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Unformatted text preview: MEM 425: Aircraft Performance & Design Home work #5 (due 10/27/11) 1. Problem 6.4 2. Problem 6.1 use maximum lift coefficient of 1.3; consider both thrust-limit and stall-limit cases; assume load-limit is not a constraint . solution Problem 6.4 Equation 6.16 (given) From this, Problem 6.1: 6.1: For a sustained turn, the minimum turn radius and maximum turn rate will be restricted by either the maximum thrust available, the stall velocity, or maximum allowable load factor. Squaring both sides (4) This yields, for BD-J4, The recalculated values are (by my calculations): , One could observe this graphically as illustrated below. As shown in text, obtain Figure 6.2 for this aircraft. 150 200 250 300 350 400 1 2 3 4 5 6 7 8 9 10 load factor .vs. velocity velocity (ft/sec) load factor stall thrust Clearly, the maximum load factor occurs at the intersection of these curves, corresponding to the computed velocity of about 190 ft/sec. (The actual velocity is 189.83 ft/sec, both analytically and computed velocity of about 190 ft/sec....
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This note was uploaded on 01/10/2012 for the course MEM 425 taught by Professor Yousuff during the Fall '08 term at Drexel.

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MEM425F11_HW5-1.soln - MEM 425 Aircraft...

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