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MEM425F09.HW3 - 3 Consider a propeller driven aircraft with...

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MEM 425: Aircraft Performance & Design Home work #3 (due 10/13/09) Relevance to Program Outcomes a-k : a, e, k --------------------------------------------------------------------------------------------------------- 1. Consider a 60,000 lb. aircraft, with a wing-area of 1000 ft 2 .: A series of tests were attempted at sea level (density: 0.002377 slug.ft -3 ) to achieve cruise flights. It was observed that with a propulsion system generating a maximum of 4000 lb. thrust, the cruise flight could be maintained only at a velocity of 300 ft.sec -1 . Determine the drag-polar of the aircraft, i.e., determine the parameters C D,0 and K in 2. Prove that the minimum power required to maintain a cruise flight is times that power required in a minimum-thrust flight. i.e.,
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Unformatted text preview: 3. Consider a propeller driven aircraft with the following characteristics: Drag polar: Weight @ beginning of cruise = 2950 lb. Wing area, S = 174 ft 2 Propeller efficiency, η = 0.8 Specific fuel consumption, c = 2.25*10-7 ft-1 It has been determined that the minimum amount of fuel needed to cruise a specified range is 367 lb. As a trade-off study, you have been asked to select a turbojet engine instead of the propeller engine. Determine the upper limit on the sfc (i.e., c t ) the turbojet engine should have to cover at least the same range with the same amount of fuel at sea level (sea level density is 0.002377 slug.ft-3 )...
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