Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Elliptic Wing-Tips Vs Winglets  
User currently offlineFaro From Egypt, joined Aug 2007, 1533 posts, RR: 0
Posted (5 years 2 months 3 weeks 3 days ago) and read 5448 times:

If winglets minimise wing-tip vortex drag by effectively extending wingspan and hence aspect ratio, why not simply do this by having ellipse-shaped wingtips (à la Spitfire) instead?

In this case, the wing-tip tapers off to a diminutive length which should not generate as much vortex drag because the wing-tip section which is -more or less- parallel to the airstream is reduced. Indeed what benefit is there in systematically having airliner wing-tips which are parallel to the airstream?

Faro


The chalice not my son
3 replies: All unread, jump to last
 
User currently offlineAeroweanie From United States of America, joined Dec 2004, 1607 posts, RR: 52
Reply 1, posted (5 years 2 months 3 weeks 2 days 22 hours ago) and read 5426 times:
Support Airliners.net - become a First Class Member!



Quoting Faro (Thread starter):
If winglets minimise wing-tip vortex drag by effectively extending wingspan and hence aspect ratio, why not simply do this by having ellipse-shaped wingtips (à la Spitfire) instead?

Having an elliptical tip is not enough - the whole wing must be elliptical to get minimum induced drag. The Spitfire's wing had twist, to produce a good stall, so it did not have the lift distribution necessary to get minimum induced drag. The main reason that the Spitfire wing was elliptical was to provide the depth necessary outboard to house the ammunition trays, without having to use high thickness to chord ratio airfoils.


User currently offlineFaro From Egypt, joined Aug 2007, 1533 posts, RR: 0
Reply 2, posted (5 years 2 months 3 weeks 2 days 22 hours ago) and read 5421 times:



Quoting Aeroweanie (Reply 1):

Having an elliptical tip is not enough - the whole wing must be elliptical to get minimum induced drag.

Is a fully-elliptical wing an economically viable solution for modern airliners? Is it compatible with wing sweep notably?

Faro



The chalice not my son
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2541 posts, RR: 25
Reply 3, posted (5 years 2 months 3 weeks 2 days 19 hours ago) and read 5366 times:

Elliptical wings are harder to make due to the complex curvature required. Perhaps less of a problem with composites. The advantage of an ideal elliptical lift distribution over the near elliptical distribution you get from straight taper aren't great in comparison with savings due to simpler manufacture.

Elliptical planform would also make it much harder to design complex high lift devices as the leading and trailing edges are continuous curves.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
Top Of Page
Forum Index

Reply To This Topic Elliptic Wing-Tips Vs Winglets
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
XB 70 Wing Drooping Wing Tips posted Fri Nov 9 2007 10:34:22 by LMML 14/32
Wing-loading Vs Ride & Turbulence posted Fri Mar 9 2007 11:43:26 by Redcordes
MD11 Wing Tips And Their Down Facing Counterparts posted Tue Feb 7 2006 07:20:28 by Videns
Older 747 Wing Tips posted Tue Aug 19 2003 06:16:56 by Kevin752
B777's Wing Tips posted Fri Feb 21 2003 20:07:40 by Aak777
Wing Tips On 777's posted Mon Sep 23 2002 07:52:14 by Flyordie
High Wing Vs. Low Wing posted Fri May 23 2008 09:23:20 by Flexo
Winglets Vs Blended Wings posted Tue Dec 25 2007 11:01:47 by Kamboi
Wing Flex, 757 Vs A320 posted Fri Sep 14 2007 04:23:12 by N9JIG
Crosswind Crab Landing VS Lowering One Wing? posted Thu Mar 8 2007 00:15:34 by SSTsomeday

Sponsor Message:
Printer friendly format