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Wingtip device
Wingtip devices are usually intended to improve the efficiency of fixed-wing aircraft.〔"(Blended Winglets )." Faye, R.; Laprete, R.; Winter, M. ''Aero'', No. 17., Boeing.〕 There are several types of wing tip devices, and although they function in different manners, the intended effect is always to reduce the aircraft's drag by partial recovery of the tip vortex energy. Wingtip devices can also improve aircraft handling characteristics and enhance safety for following aircraft. Such devices increase the effective aspect ratio of a wing without materially increasing the wingspan. An extension of span would lower lift-induced drag, but would increase parasitic drag and would require boosting the strength and weight of the wing. At some point, there is no net benefit from further increased span. There may also be operational considerations that limit the allowable wingspan (''e.g.'', available width at airport gates).
Wingtip devices increase the lift generated at the wingtip (by smoothing the airflow across the upper wing near the tip) and reduce the lift-induced drag caused by wingtip vortices, improving lift-to-drag ratio. This increases fuel efficiency in powered aircraft and increases cross-country speed in gliders, in both cases increasing range.〔 U.S. Air Force studies indicate that a given improvement in fuel efficiency correlates directly with the causal increase in the aircraft's lift-to-drag ratio.〔Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft, National Academies Press, 2007, p.33〕
== Early history ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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