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study of blended wing body air craft

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CHAPTER 1 INTRODUCTION 1.1 Motivation On 17 December 1903, at a little after 1030 in the morning, a winged contraption made of canvas, wood and wire began to move along a rail placed on a freezing, gale-lashed sand flat in  North Carolina. As a tiny petrol engine strained to turn the machine's twin propellers, it gained speed and its wings began to generate lift. As the force increased and overcame the craft's weight, Orville and Wilbur Wright's Flyer took to the air. It remains one of the greatest moments in technological history. But with the success of that first flight of a powered, heavier-than-air craft - all 12 seconds of it - it would be tempting to think that the pair of Ohio bicycle mechanics had solved aviation's engineering problems. But now, in the second century of powered flight, aviation engineers are still battling to find better ways to solve some of the very same problems the Wrights faced, and many others of which the pair could never have dreamed.  A short 44 years after 1903, the swept-wing Boeing B-47 took flight. A comparison of these two airplanes shows a remarkable engineering accomplishment within a period of slightly more than four decades. Embodied in the B-47 are most of the fundamental design features of a modern subsonic jet transport: swept wing and empennage and podded engines hung on pylons beneath and forward of the wing. The AirbusA330, designed 44 years after the B-47, appears to be essentially equivalent, as shown in Fig. 1. Apart from evolutionary improvements in conventional aircraft, revolutionary changes are  possible when the "rules" are changed. This is possible when the configuration concept itself is changed and when new roles or requir ements are introduced. The aircraft market is a fast growing  but also competitive business. Therefore the aircraft building companies in vest a lot of effort into the research for new aircraft configurations to be one step ahead of the other companies to accomplish the given constraints and requirements for the aircraft market of tomorrow. One of the results of these researches is the blended wing body aircraft (BWB). The BWB is a non conventional aircraft configuration.

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