MEM425F09_9.TailStab

MEM425F09_9.TailStab - MEM425 Aircraft Design Performance...

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MEM425: Aircraft Design & Performance Dr. Ajmal Yousuff Dept. MEM Drexel University
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overview Conventions Notations Tail effects Downwash Location & size Governing equations Design implications yousuff MEM425 Aircraft Design 2
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cg and ac locations ( h and h ac ) yousuff 3 , , , , cos ( ) sin ( ) sin cos cg w ac w w w ac w w w ac w w w w w M M L hc h D hc h L zc D zc   Non dimensionalise ( qSc); assume z ≈0, small w , D ≪L . , , , , , , () M cg w M ac w L w ac w C C C h h , , , , , wb wb wb M cg M wb w c ac b a C C h h a …(7.4) …(7.10)
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Tail effect Two factors to consider Change in (due to down wash ) Change in |V| (due to friction …) ----- negligible yousuff MEM425 Aircraft Design 4
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Tail contribution yousuff MEM425 Aircraft Design 5   ,, cos( ) sin( ) sin( ) cos( ) cg t ac t t t wb t wb t t wb t t wb M M l L D z L z D assume z t l t , D ≪L , small ( wb - ) and M ac,t .
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MEM425F09_9.TailStab - MEM425 Aircraft Design Performance...

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