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Date: Mon, 23 Jan 2006 01:50:41 -0500
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From: "Skip Slater" <skipslater@earthlink.net>
References: <list-940868@logan.com>
Subject: Re: [LML] Re: Winglets versus Wingtips
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The benefit of winglets on airliners is more than just looking cool.
   Blended winglets like the ones you see on 737's actually increase fuel 
efficiency somewhere on the order of 4%, which is why so many airlines are 
paying well into six figures per plane to install them.  The aerodynamic 
benefits are many:
    With winglets, you can takeoff at a greater weight in any given 
conditions due to the increased lift they create.
    The increased span adds wing area, giving greater lift, which benefits 
not only takeoff and climb performance, but enables higher altitude cruise 
for any given weight, which equates to lower fuel burn.  This also gives the 
planes greater range and endurance.
   The winglets reduce the drag created by wingtip vortices at lower speeds. 
As the flow from the bottom of the wing tries to curl up and over the 
wingtip, it hits the winglet, creating further lift and in turn, avoiding 
the drag caused if the flow curls all the way over to the top of the wing.
   And oh by the way, they look cool.

   Skip Slater
   N540ES