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6.DragPolar - MEM425 Aircraft Performance and...

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MEM425: Aircraft Performance and Design (drag-polar) Dr. Ajmal Yousuff Dept. MEM Drexel University
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“Engine Selection” (5.3.2) Yousuff MEM 425 Aircraft 2 In a cruise flight: 2 ,0 D D L T D qSC qS C KC 2 2 ,0 ,0 1 ( / ) ( / ) 4 ( / ) 2 D D q T S T S C K W S C
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Altitude effects (5.3.2) Yousuff MEM 425 Aircraft 3 0 0 ( / ) a a T T min ,0 2 T D W K V S C  
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Drag Polar manipulation Yousuff MEM 425 Aircraft 4 ,0 2 L D D C C K C 3/2 1/2 / , / , / L D L D L D C C C C C C Maximization of is important ,0 / ( / ) D L D L L C C C C KC
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The drag-polar yousuff MEM425 Aircraft Design 5 Drag-polar reflects the aerodynamic efficiency of the vehicle 2 ,0 D D L C C KC While the design parameters {C D,0 ,K} are fixed, C L could be changed in flight. Three important ratios: 3/2 1/2 , , L L L D D D C C C C C C
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3/2 max L D C C The ratio: yousuff MEM425 Aircraft Design 6 3/2 / L D C C
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The ratio: yousuff MEM425 Aircraft Design 7 max L D C C / L D C C
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The ratio: yousuff MEM425 Aircraft Design 8 1/2 max L D C C 1/2 / L D C C
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