16100lecture9_cg

16100lecture9_cg - Brequet Range Equation V t=tf W=Wf t=ti...

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16.100 2002 1 Brequet Range Equation f i t t Range Vdt = In level flight at const speed: LW = , Lift = Weight TD = , Thrust = Drag The aircraft weight changes during flight due to use of fuel. Relate weight change to time change: dW dW dt dt fuel weight dt time fuel weight T dt time T = =− The quantity: 1 fuel weight time T is known as the specific fuel consumption or sfc. It has units of: sfc units = () fuel lb force or lb hr force time −− 1 f i W W dW sfc T dt V Range dW sfc T ⇒=
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16100lecture9_cg - Brequet Range Equation V t=tf W=Wf t=ti...

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