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In 2006 Airbus tested two candidate blended winglets, designed by Winglet Technology and Airbus for the Airbus A320 family. [25] In 2009 Airbus launched its "Sharklet" blended winglet, designed to enhance the payload-range of its A320 family and reduce fuel burn by up to 4% over longer sectors. [ 26 ]
Current aircraft designs already employ winglets aimed at increasing the cruise flight efficiency by induced drag reduction. Smart intelligent Structures propose a state of the art technology that incorporates a wingtip active trailing edge, which could be a means of reducing winglet and wing loads at key flight conditions.
The Spiroid winglet is a closed wing surface attached to the tip of a conventional wing. Wingtip vortices form a major component of wake turbulence and are associated with induced drag, which is a significant contributor to total drag in most regimes. A closed wing avoids the need for wingtips and thus might be expected to reduce wingtip drag ...
From the 1980s onwards, the development of such aircraft were curtailed by advances in flight control technology and structural materials which have allowed designers to closely tailor the aerodynamics and structure of aircraft, removing the need for variable sweep angle to achieve the required performance; instead, wings are given computer ...
This was a new aircraft destined for American Airlines and in their livery. With this, the first ecoDemonstrator, Boeing tested laminar flow technology for winglets, improving fuel efficiency by 1.8 percent. This fed directly into the design of the winglets used on the subsequent 737 MAX series. [19] The aircraft tested other technologies ...
A rendering of the US Air Force blended wing body aircraft project. A blended wing body (BWB), also known as blended body, hybrid wing body (HWB) or a lifting aerofoil fuselage, [1] is a fixed-wing aircraft having no clear dividing line between the wings and the main body of the craft. [2]
They started setting a number of World Records in performance with the winglets. [2] In 1997, API's winglets were sold as a standard fit on all Boeing Business Jets, and winglets were offered as an addition to standard 737s. Around 95% of all 737 customers want winglets fitted. [2] An API blended winglet on a Boeing 737-800
Winglets have the opposite effect to washout. Winglets allow a greater proportion of lift to be generated near the wing tips . (This can be described as aerodynamic wash-in.) Winglets also promote a greater bending moment at the wing root, possibly necessitating a heavier wing structure.