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Is It Possible To Develop A Flap...  
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Posted (7 years 9 months 2 weeks 16 hours ago) and read 2583 times:

Is it possible to develop a flap that features a flip out winglet to increase overall lift and reduce flap vortices?

Andrea K

5 replies: All unread, jump to last
 
User currently offlineGAIsweetGAI From Norway, joined Jul 2006, 934 posts, RR: 7
Reply 1, posted (7 years 9 months 2 weeks 15 hours ago) and read 2554 times:

There are 2 things I can think of that would prevent flap winglets from happening:
1. the extra weight of the device
2. how do you store the winglet? Using solid materials it would be impossible to store the winglet: the flap is too thin for the winglet to be stored inside, and/or it couldn't be folded easily; and it is impossible to make it sit on top of the flap when stored, as both are airfoils and have a convex shape.

That being said, I don't think I'm very knowledgeable about aerodynamics etc.



"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 2, posted (7 years 9 months 2 weeks 15 hours ago) and read 2547 times:

My best guess is that there really is no need for "flap-lets." The flaps are stored in cruise, which is where the winglet becomes advantageous. Despite the fact that they would make less drag and more lift, since only a small portion of flight is done in "dirty configuration," I would see it as extra weight.

User currently offlineOly720man From United Kingdom, joined May 2004, 6840 posts, RR: 11
Reply 3, posted (7 years 9 months 2 weeks 11 hours ago) and read 2471 times:

Because of the high flap deflection angle, the tip vortices developed could well help the flow stay attached. By disrupting this flow it's possible that flap lift would be lost.


wheat and dairy can screw up your brain
User currently offlineScooter01 From Norway, joined Nov 2006, 1207 posts, RR: 8
Reply 4, posted (7 years 9 months 1 week 6 days 12 hours ago) and read 2333 times:
Support Airliners.net - become a First Class Member!

The Soviet team of Nikitin-Sevchenko designed a version of the Polikarpov I-15 biplane in 1939 which was called IS-1. It featured a lower wing (with inward retractable gear) that folded up along the sides of the fuselage and a hinged outer part that buried itself in the underside of the top wing.
The pilot could reconfigure this when he needed the low speed and maneuverability of a biplane, or the speed of a monoplane. Flight trials proved the design usable, but operational problems and maintenance in the war-time made further developments impossible.

Source: "Fighters Volume three" by William Green. Published by Macdonald&Co 1961

Scooter



"We all have a girl and her name is nostalgia" - Hemingway
User currently offlineVikkyvik From United States of America, joined Jul 2003, 10253 posts, RR: 26
Reply 5, posted (7 years 9 months 1 week 6 days 11 hours ago) and read 2314 times:
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Quoting Oly720man (Reply 3):
Because of the high flap deflection angle, the tip vortices developed could well help the flow stay attached. By disrupting this flow it's possible that flap lift would be lost.

Consider, also, that at higher flap deflections (say, flaps 25, 30, and 40 on a 737), in addition to adding lift, you're also already increasing the drag quite significantly. I'm not totally sure that a small drag reduction due to "flap-lets" would really be useful in those regimes of flight.

You'd also need some sort of aerodynamic housing that would contain the mechanism that deploys and stores the flap-let, which would add weight, and some profile drag.

Also, as was stated by N231YE, winglets are at their best over longer-range cruises.

~Vik



How can I be an admiral without my cap??!
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