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Winglet Question  
User currently offlineFly_yhm From Canada, joined Dec 2000, 1714 posts, RR: 8
Posted (9 years 2 months 3 weeks 5 days 8 hours ago) and read 2463 times:

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?

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3 replies: All unread, jump to last
User currently offlineCRJonBeez From United States of America, joined Nov 2004, 317 posts, RR: 3
Reply 1, posted (9 years 2 months 3 weeks 5 days 6 hours ago) and read 2447 times:


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

User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 2 months 3 weeks 5 days 5 hours ago) and read 2441 times:

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...  Wink

User currently offline2H4 From United States of America, joined Oct 2004, 8957 posts, RR: 56
Reply 3, posted (9 years 2 months 3 weeks 5 days 5 hours ago) and read 2437 times:

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.


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