MEM425F09.Ex1.soln

# MEM425F09.Ex1.soln - MEM 425 Aircraft Design Performance...

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Exam #1 October 15, 2009 Time limit: 1 hr. 30 min. Open book, open notes (Relevance to Program Outcomes a-k : a, e) Plagiarists will be put to rest Relevance to Program Outcomes a-k : a, c, e

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1. Consider a jet engine aircraft with the characteristics given below. While cruising at an altitude of 30000 ft. (density = 8.9068E-04 slug.ft -3 ), it was determined to let the aircraft loiter for 1 hour at this altitude (as in the case of waiting for airport clearance). a. Determine the minimum weight of fuel needed for this loiter. b. Calculate the average velocity in this flight. {(average_velocity=(distance_travelled)/(time_taken)} c. compute the velocities of the aircraft i. with full tanks (i.e., @ beginning of loiter) ii. with empty tanks (i.e., @ end of loiter) Characteristics: Wing span = 75.0 ft. Wing area = 950 ft 2 . Weight, “without fuel”* = 43,500 lb. Parasite drag coefficient
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## This note was uploaded on 11/17/2009 for the course MEM 425 taught by Professor Yousuff during the Spring '08 term at Drexel.

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MEM425F09.Ex1.soln - MEM 425 Aircraft Design Performance...

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