11.DesignWt

11.DesignWt - MEM 425 Aircraft Design & Performance...

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MEM 425 Aircraft Design & Performance Design Dr. Ajmal Yousuff Dept. MEM Drexel University
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Yousuff MEM 425 aircraft 2 Refined sizing and performance optimization Design reqmnt New concepts Available technology Concept sketch Sizing and performance optimization First guess sizing Initial layout Revised layout
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Take-off weight buildup Most, if not all, performance calculations involve, and are dictated by, weight. In the process - rough sizing Example: a “simple mission” Yousuff MEM 425 aircraft 3
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Weight break-down Yousuff MEM 425 aircraft 4 W 0 : Design Take-off Gross weight ++ f and e are to be determined via an iterative process
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Weight ratios Yousuff MEM 425 aircraft 5   0 0 0 00 crew payloa f d e W W W W W W W W W and are easier to estimate f e W W WW
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Empty weight ratio - statistics Estimation of W e /W 0 : Use statistics: Yousuff MEM 425 aircraft 6 Jet fighter Jet transport Flying boat Military cargo/bomber agricultural General, 1-engine Empty weight fraction trend 10 2 10 3 10 4 10 5 10 6 .4 .5 .6 .7 0 W 0 e W W (Fig. 3.1)
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11.DesignWt - MEM 425 Aircraft Design & Performance...

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