MEMf425F09_11.DesignWt

MEMf425F09_11.DesignWt - MEM 425 Aircraft Design &...

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MEM 425 Aircraft Design & Performance Design Dr. Ajmal Yousuff Dept. MEM Drexel University
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A flow-chart Yousuff MEM 425 aircraft 2 Refined sizing and performance optimization Design reqmnt New concepts Available technology Concept sketch Aero. weights propulsion Sizing and performance optimization Aero. weights propulsion cost structures Etc. Preliminary design First guess sizing Initial layout Revised layout iterate
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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 landing glide loiter cruise climb Take-off ++ no combat ++ no payload drops
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Weight break-down Yousuff MEM 425 aircraft 4 W 0 : Design Take-off Gross weight = crew payload fuel empty + + + (unknown –depends on “design”) depends on mission) (Given –passengers, …) (Given) ++ 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
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This note was uploaded on 11/17/2009 for the course MEM 425 taught by Professor Yousuff during the Spring '08 term at Drexel.

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MEMf425F09_11.DesignWt - MEM 425 Aircraft Design &...

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