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MEM425F11_HW3

MEM425F11_HW3 - Characteristics Wing span = 75.0 ft Wing...

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MEM 425: Aircraft Performance & Design Home work #3 (due 10/11/11) 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 c.i. with full tanks (i.e., @ beginning of loiter) c.ii. with empty tanks (i.e., @ end of loiter)
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Unformatted text preview: Characteristics: Wing span = 75.0 ft. Wing area = 950 ft 2 . Weight, without fuel* = 43,500 lb. Parasite drag coefficient = 0.015 Oswald efficiency factor = 0.7 Specific fuel consumption = 0.69 lb/lb-hr . * ie., weight at the end of loiter 2 . A propeller driven airplane weighing 5000 lb. is flying for maximum endurance at sea level with a velocity of 200 mi. hr-1 . The wing area and aspect ratio are 200 ft 2 and 8.5, respectively. The Oswald efficiency factor is 0.93. Calculate the total drag on the airplane. (sea level density is 0.002377 slug.ft-3 , and 1 mi. = 5280 ft.)...
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