MEM425F09_14.Design.eg1

MEM425F09_14.Design.eg1 - MEM 425 Aircraft Design &...

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MEM 425 Aircraft Design & Performance Design Example (Chapter 8) Dr. A. Yousuff Dept. MEM Drexel University
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Propeller-driven aircraft Requirements: 5 passengers + a pilot Specifications: Max velocity at cruise: 250 mi/h. Range: 1200 mi. Ceiling: 25000 ft. r/c @ sea level: 1000 ft/min. Stall velocity: 70 mi/h. 50’ landing distance: 2200 ft . 50’ take_off distance: 2500 ft. yousuff MEM 425 aircraft design 2
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1 st weight estimate W e /W 0 : » We could use the “curve - fit” for 1 -engine: yousuff MEM 425 aircraft design 3 0 00 1 crew payload f e WW W W W  0 0.62 e W W
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Fuel weight estimate Simple mission, consisting of 0 1: take_off 1 2: climb 2 3: cruise 3 4: descent & loiter 4 5: landing Using weight fractions yousuff 4 5 5 3 5 1 2 4 0 0 0 0 1 2 3 4 1.06(1 ); f W W W W W W W W W W W W W W W W From statistics 0 1 2 3 4 5 loiter
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Fuel for range/cruise 2 3 ln t W VL R c D W    yousuff MEM 425 aircraft design 5 For fuel computations, we could use either of these eqns.: 2 3 W L R c D W Raymer, in class In text 1 1 ;( ) (550)(3600) bhp c c ft 1 ; ( ) 550 t bhp p V cc hr
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This note was uploaded on 12/06/2009 for the course MEM 425 taught by Professor Yousuff during the Fall '08 term at Drexel.

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MEM425F09_14.Design.eg1 - MEM 425 Aircraft Design &...

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