fly_yhm
Topic Author
Posts: 1647
Joined: Fri Dec 01, 2000 1:12 pm

Winglet Question

I have a question regarding winglets. Would they work on airliners the same way if they were pointing down?
has there ever been an aircraft with winglets like this before?
Where will you spend eternity? He,s more real then you think!!!!!

CRJonBeez
Posts: 310
Joined: Mon Nov 29, 2004 8:08 am

RE: Winglet Question

http://en.wikipedia.org/wiki/Winglet

i can't think of any aircraft flying that uses a winglet facing downwards, but i'm sure somebody tried it out. the only comparable thing i can come up with is the wing fence used on some airbus models and the MD11

OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: Winglet Question

Notwithstanding the aerodynamic factors, installing blended winglets that point downward might as well come equipped with big bullseyes painted on them, since they'd be subject to being hit by any/every type of vehicle operating on the airport ramp...
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.

2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Winglet Question

From http://www.mandhsoaring.com/articles/Winglet_Design.pdf:

The effect of the winglet is to produce a vertical diffusion of the vorticity in tip region. This diffusion process is also realized as an expansion of the wake in the far field due to induced velocities from the nonplanar components of the
winglet. The out of plane bound vortex on an upward winglet induces horizontal velocities on the free wake that cause a spanwise spreading of the wake field.

When referenced to the actual span, the resulting efficiency can be greater than that of an elliptical loading, emulating the effect of a span increase. It should be noted that, while still beneficial, a winglet downward oriented would produce a contraction of the wake and is not as effective in reducing the induced drag as is a winglet oriented upward.

2H4

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