3.T&Preq

3.T&Preq - MEM 425: Aircraft Performance &...

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MEM 425: Aircraft Performance & Design Dr. Ajmal Yousuff Dept. MEM Drexel University
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Longitudinal Flight Equations of motion: Yousuff MEM 425 2 horizon velocity q L D a T a T W
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Basic equations Consider un-accelerated level flight ( 0) F ( 0) q Yousuff MEM 425 3
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Thrust required For level un-accelerated flight: Given W, S, V, r , what is the thrust (T R ) required? This yields: Yousuff MEM 425 4 2 12 2 L L W V SC V SC
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T R minimization Note max min ( / ) R L D T  Yousuff MEM 425 5 max ) / ( D L max ) / ( D L a D L C C a
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min- T R contd. Note: Flight can be maintained at other angles of attack, but only with larger thrust. (L/D) depends on V Hence, T R is a function of V . 2 ,0 2 ( , ) 1 2 L D D L W C C C KC VS r Yousuff MEM 425 6
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Thrust build-up ) ( 2 1 2 1 2 0 , 2 2 L D D KC C S V SC V D T r Yousuff MEM 425 7 2 2 with , we get L C VS W 2 2 2 0 , 1 2 2 1 V S W K V SC T D
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T
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3.T&Preq - MEM 425: Aircraft Performance &...

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