Page 8 - Mar17ABS

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Specialized Aero
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In the early 1900’s William E. Somerville developed the first functional winglets, which he installed the devices on his early biplane and monoplane designs.
Winglets: Harnessing the Potential
Contrary to popular belief, winglets are not a recent invention. It has been known for more than a century that an endplate at the tip of a finite wing can reduce drag and increase wing performance. As air flows over the wing, high pressure on the wing’s lower surface and the low pressure on the top surface, that creates lift. When flow around the wingtips streams out behind the airplane, a vortex is formed. Wingtip vortices, besides causing a wake turbulence hazard for trailing aircraft, creating an unavoidable consequence: induced drag. Angling the end of the wing upward increases the effective aspect ratio of the wing and change the pattern and magnitude of the vortex.
The concept of winglets as a drag reduction structure dates to 1897 when English engineer Frederick W. Lanchester patented wing end-plates as a method for controlling wingtip vortices. In the United States, Scottish-born engineer William E. Somerville developed the first functional winglets in 1910. Somerville
The Tamarack winglet is highly tuned to maximize its aerodynamic efficiency, allowing the CJ to fly farther and on less fuel. The system makes the aircraft so stable at altitude, the yaw damper inop limitation is removed.
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