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Download Assessment of Wingtip Modifications to Increase the Fuel by National Research Council, Division on Engineering and PDF

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By National Research Council, Division on Engineering and Physical Sciences, Air Force Studies Board, Committee on Assessment of Aircraft Winglets for Large Aircraft Fuel Efficiency

The excessive rate of aviation gas has led to elevated cognizance through Congress and the Air strength on bettering army airplane gas potency. One motion thought of is amendment of the aircraft’s wingtip via fitting, for instance, winglets to lessen drag. whereas universal on advertisement airplane, such alterations were much less so on army plane. In an try and inspire better Air strength use during this region, Congress, in H. Rept. 109-452, directed the Air strength to supply a document studying the feasibility of enhancing its plane with winglets. to aid during this attempt, the Air strength requested the NRC to judge its airplane stock and determine these airplane which may be solid applicants for winglet adjustments. This reportâ€"which considers different wingtip differences as well as wingletsâ€"presents a assessment of wingtip differences; an exam of prior analyses and adventure with such adjustments; and an evaluation of wingtip alterations for varied Air strength airplane and capability funding strategies.

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Extra info for Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft

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However, the fuel economy of military aircraft has become an increasing concern as well. S. S. , April 19. Data provided by Defense Energy Support Center (DESC) on fuel usage by mission design series for FY05. Ibid. Terry Pudas, 2006, “A strategic approach to energy,” Defense Technology International May/June:42. ” SOURCE: Aviation Partners Boeing (APB). performance, and the weight efficiency.  This report examines potential aerodynamic improvements in large military tanker and transport aircraft in greater detail, in particular the potential for the modification of the wingtips to reduce aerodynamic drag.

If an aircraft is span constrained, a well-designed winglet can provide a significant reduction in drag. However, if an aircraft is not span constrained, whether to use winglets or tip extensions is less clear. Both winglets and tip extensions add bending loads, subsequently increasing the wing weight. 14 Both of these studies employed highly simplified models of the wing structure. In practice, the existing structure and load distribution must be considered. , due to minimum gauge constraints) but little is available at the root, a winglet might be added more easily than a span extension.

Additional methods that might be considered by the Air Force to improve fuel economy, such as other aerodynamic changes, improving maintenance and operations, and reducing unnecessary weight, are discussed in Appendix B. 2 Wingtip Modifications HISTORY OF WINGTIP DEVICES Within a few years of the first heavier-than-air flight, the idea of beneficial wingtip devices was introduced. Lanchester patented the concept of a wing end plate in 1897 and suggested that it would reduce wing drag at low speeds.

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