Boeing777228
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Joined: Sat Dec 22, 2007 8:15 pm

"Growths" On The Bottom Of Wings

Mon Sep 08, 2008 12:46 am

What's up with the "growths"(I can't think of a better word) on the bottom of airliner wings??? What do they do??? Arent they just extra parasite drag???
 
Blackbird
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RE: "Growths" On The Bottom Of Wings

Mon Sep 08, 2008 12:48 am

Do you mean the canoe fairings on the back of the wings (flap underside)?

Blackbird
 
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Starlionblue
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RE: "Growths" On The Bottom Of Wings

Mon Sep 08, 2008 1:43 am

Sounds like the flap track fairings to me as well.

So to answer your question: they are flap track fairings. The flaps have mechanisms for extension, typically in the form of jackscrews. In order to reduce drag and decrease exposure to the elements, the mechanisms (flap tracks) are enclosed in fairings. If a fairing is missing or damaged, most aircraft can dispatch without it but there is a fuel burn penalty.

As Blackbird says, they are often called canoes or canoe fairings.



Another "growth" (I love that) is the drag reducing bump on the underside of 340 wings. IIRC it is close to the outboard engine. I'm sure someone can dig up a pic.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
Boeing777228
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Posts: 7
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RE: "Growths" On The Bottom Of Wings

Mon Sep 08, 2008 2:31 am

Yes the canoe fairings! That's what I mean. And now it makes sense that they house the jackscrew for the flaps. Thanks for the replies.
 
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Starlionblue
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RE: "Growths" On The Bottom Of Wings

Mon Sep 08, 2008 4:02 am

Here's a plane with a missing fairing. Outboard on left wing.


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