MEM425F09_10.Control

MEM425F09_10.Control - MEM 425: Aircraft Design &...

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MEM 425: Aircraft Design & Performance (longitudinal control) Dr. Ajmal Yousuff Dept. MEM Drexel University
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Eqns. For Static Stability Condition I: C M,0 >0 (static balance) Condition II: (static stability) Yousuff MEM 425 Aircraft 2 , 0 M cg C
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Implications Condition I : Condition II: Fix V H first (from Condition II) and then i t (from Condition I) Yousuff MEM 425 Aircraft 3
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The stability criterion is also given in terms of c.g. location w.r.t. so called neutral point . Affects passenger and payload distribution Yousuff MEM 425 Aircraft 4
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Neutral Point (h n ) Suppose c.g. moves (i.e. h varies) {ejection of payload …} However, By varying h : a location of c.g (neutral point) @ which does not change (almost) will change
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Location of neutral point C M - curve’s slope is zero when h=h n Note: h n is an abstract point , fixed on an aircraft h n is independent of the actual location of the c.g.
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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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MEM425F09_10.Control - MEM 425: Aircraft Design &...

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