Exam 1 solution

# Exam 1 solution - MEM 425: Aircraft Design &amp;...

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Exam #1 October 14, 2010 Time limit: 1 hr. 30 min. Open book, open notes NO LAPTOPS (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 = 80.0 ft. Wing area = 1000 ft 2 . Weight, “without fuel”* = 45,000 lb. Parasite drag coefficient
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## Exam 1 solution - MEM 425: Aircraft Design &amp;...

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