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727 Wing Cuff  
User currently offlineKIWI From New Zealand, joined Nov 2003, 0 posts, RR: 0
Posted (15 years 6 months 2 weeks 23 hours ago) and read 1837 times:

Hello all!....Does anyone know what purpose(s) that "cuff" serves on the leading edge of the B-727? Thanks!

4 replies: All unread, jump to last
 
User currently offlineL-188 From United States of America, joined Jul 1999, 29795 posts, RR: 58
Reply 1, posted (15 years 6 months 2 weeks 21 hours ago) and read 1838 times:

You have me a little bit confused about what you mean by a cuff. I understand a cuff as a downward rounding of the bottom leading edge of the wing to increase the lifting charicteristics of the wing.

Are you refering to possibly the Kreuger flaps on the leading edge that droop down when the aircraft is shut down? or are you possibly refering to the fence on the upper leading edge of the wing. I don't know the specific reason for it on the 727 but a fence is instaled so that air is prevented from flowing parel to the leading edge of the wing rather then over it at high speeds. If I remember right is is located about where the inboard aileron is on the trailing edge. So it might be there to direct airflow over that control surface. But this is just a guess.

Did I hit on what you are looking at or can you narrow down the choices a little bit? I hope this helps.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineCapK From , joined Dec 1969, posts, RR:
Reply 2, posted (15 years 6 months 2 weeks 20 hours ago) and read 1838 times:

Hey KIWI1 Hows it goin?
@ the end of this message people are probably going to say" Um..ok...what's your point??"
I know that there are SEVERAL high lift devices on the B727. This "cuff" you are talking about most likley(like L-188 said) contibuted to added lifting of the aircraft. Tell me, is the cuff seen when the aircraft has the flaps deployed or when everything is retracted? I am wondering if it is the different deisgn of the leading edge's slats you are talking about. Oh well, I doubt I cleared anything up. Hehe.
Best regards'
CapK


User currently offlineKIWI From New Zealand, joined Nov 2003, 0 posts, RR: 0
Reply 3, posted (15 years 6 months 2 weeks 20 hours ago) and read 1838 times:

You were right when you mentioned the fence. The object in question is located right where you said..... on the upper leading edge in front of the inner aileron. The airflow over the control surface makes sense. Thanks!

User currently offlineL-188 From United States of America, joined Jul 1999, 29795 posts, RR: 58
Reply 4, posted (15 years 6 months 2 weeks 5 hours ago) and read 1839 times:

Ok. Now I know what you where talking about.

A Cuff is a weird thing to put on the wing of a +400 mile/hour jet since it makes the wing more draggy and increases the lift. Because it is a permanet non-adjustable feature most designers use either slats of kruger flaps so they can have a high speed wing and then change the shape if for takeoffs and slow speed flight.

You see a lot of wing cuffing when they put STOL kits on small airplanes like Cessna 207 and 185's. The only heavy transport I have seen with a cuffed wing is the IL-62M. It has a very large Cuff that runs down the outboard panel of the wing from where the wing jogs out to the tip. That jog in the wing by they way is employed to do the same job as a fence. To keep air from flowing down the length of the wing rather then over itl. You see this a lot more on military fighters though. The cuff on the IL-62 may have a lot to do with it's reputation as a gas hog.

You may want to through this question to Will on this site. I belive he is a 27 FE and knows more about the airplane then I do. I just made an educated guess based on what fences are normaly put on an airplane to do.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
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