14.Design

# 14.Design - Performance DesignExample(Chapter 8 Dr A...

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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
1 st weight estimate W e /W 0 : 0 0 c e v s W AWK yousuff MEM 425 aircraft design 3 0 00 1 r w payload f  We could use the “curve - fit” for 1 -engine:

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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 MEM 425 aircraft design 4 5 5 3 5 1 2 4 0 0 0 0 1 2 3 4 1.06(1 ); f W WW WWWW 5 12 0 1 4 0.97; 0.985; 0.995 From statistics 0 1 2 3 4 5 loiter
Fuel for range/cruise yousuff MEM 425 aircraft design 5 For fuel computations, we could use: 2 3 ln W L R c D    In text 1 1 ;( ) (550)(3600) bhp ft 0.

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14.Design - Performance DesignExample(Chapter 8 Dr A...

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