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AP1200_Ch1_Mechanics-4Supplement-2007

AP1200_Ch1_Mechanics-4Supplement-2007 - AP1200 1 Mechanics...

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1 AP1200 – 1. Mechanics Concepts AP1200 – 1. Mechanics Concepts 1.4 Supplement on Flight 1.4 Supplement on Flight Michel A. Van Hove Michel A. Van Hove WARNING: PRINTING THIS DOCUMENT WILL USE MUCH INK AND WILL NOT SHOW ANIMATIONS.
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2 The Delicate Equilibrium of an Airplane The Delicate Equilibrium of an Airplane Is a cruising airplane in full equilibrium? 9 thrust drag lift weight
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3 Increasing thrust Increasing thrust What happens when a cruising airplane increases thrust ? assume thrust now remains higher and constant thrust > drag forward acceleration speed increases drag increases, so acceleration decreases higher speed lift also increases lift > weight upward acceleration aerodynamics tilts nose up, so thrust, drag and lift are tilted along rising slope but weight still vertical weight component along slope pulls back speed decreases until vertical component of lift is small enough to balance weight; drag also reduced
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