MEM425F09_16.StickFree

MEM425F09_16.StickFree - MEM425 Aircraft Performance and...

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Unformatted text preview: MEM425 Aircraft Performance and Design Dr. A. Yousuff Dept. MEM Drexel University Stick fixed.vs.free stability In previous analysis of longitudinal static stability it was assumed that trim could be obtained and ‘held’. ‘stick fixed’ stability analysis requires constant attention of pilot or power control (used in most new vehicles) In light aircraft, let the elevator float. ‘stick free’ stability analysis A. Yousuff Aircraft Design 2 stick free stability analysis aerodynamic moment about the hinge of the elevator will ‘deflect’ the elevator V' elevator will seek a ‘neutral’ position A. Yousuff Aircraft Design 3 elevator ‘balancing’ A. Yousuff Aircraft Design 4 rudder ‘balancing’ A. Yousuff Aircraft Design 5 hinge moment determine ‘neutral’ position free by setting elevator-hinge-moment He 0 ct Se: portion of the elevator plan form area that lies behind the hinge line. A. Yousuff Aircraft Design 6 free-elevator free from experiments: Che Che t t Che e e A. Yousuff Aircraft Design 7 free elevator factor Recall CL ,t at t CL,t e e C f L ,t at t CL,t Che / t e Che / e t A. Yousuff Aircraft Design 8 reduction in stability Recall CM ,cg CM ,ac CL (h hac ) VH CL,t CM ,0 CM ,ac VH at it 0 A. Yousuff Aircraft Design 9 discussion h stick-free SM stick-fixed SM hnf hn A. Yousuff Aircraft Design 10 example A. Yousuff Aircraft Design 11 ...
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MEM425F09_16.StickFree - MEM425 Aircraft Performance and...

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