Lecture-1 - Importance of Weight and Integrity Aircraft...

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Importance of Weight and Integrity • Aircraft cost, take-off and landing distances are all directly dependent on empty weight of the aircraft. • A pound of structural weight saved is a pound of payload that can be carried. • Structures must be strong enough to either – fail safe : Will not fail during the life of the component – safe fail: If a component fails, an alternate load path must be available to carry the loads, so that no single failure will be hazardous to the aircraft/spacecraft.
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Development of Aircraft Structures • Early aircraft were built with light wood, tension wire, and fabric. (See figures in the next slides). • Next step was the substitution of metal for wood. Steel and aluminum were used around 1920. • External bracing and struts slowly disappeared. Drag decreased. • In earlier designs, the skin did not carry any load. Later designs relied on skins, stiffened with stiffeners or stringers to carry some of the load (Figures 18.3, 18.4) • The skin thickness varied from root to tip of a wing, to
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This note was uploaded on 01/18/2012 for the course AAE 352 taught by Professor Chen during the Fall '08 term at Purdue University-West Lafayette.

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Lecture-1 - Importance of Weight and Integrity Aircraft...

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