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"Growths" On The Bottom Of Wings  
User currently offlineBoeing777228 From United States of America, joined Dec 2007, 21 posts, RR: 0
Posted (4 years 8 months 2 weeks 5 days 8 hours ago) and read 2856 times:

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???

4 replies: All unread, jump to last
 
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 1, posted (4 years 8 months 2 weeks 5 days 8 hours ago) and read 2856 times:

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

Blackbird

User currently offlineStarlionblue From Hong Kong, joined Feb 2004, 15871 posts, RR: 66
Reply 2, posted (4 years 8 months 2 weeks 5 days 7 hours ago) and read 2820 times:

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." - from Citadel by John Ringo
User currently offlineBoeing777228 From United States of America, joined Dec 2007, 21 posts, RR: 0
Reply 3, posted (4 years 8 months 2 weeks 5 days 6 hours ago) and read 2801 times:

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.

User currently offlineStarlionblue From Hong Kong, joined Feb 2004, 15871 posts, RR: 66
Reply 4, posted (4 years 8 months 2 weeks 5 days 4 hours ago) and read 2764 times:

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


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Photo © Pedro Aragão




"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
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