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Why Is The Wing's LE/TE Dist. Shorter On The Tip?  
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Posted (11 years 1 week 1 day 19 hours ago) and read 3276 times:

Hi everyone, I was wondering why aren't most wings the same length from the leading edge to the trailing edge (is that is called the chord of the wing?) all along the span. I was making a small model airplane, and I guessed that with more surface area all along the wing but maintaining the same wingspan it would have more lift. My prediction was accurate, and the airplane flew better that the others I made. But why aren't airliners that way?

If it is not clear I'll try and re-explain my inquiry. Thanks in advance!

-Alfredo

5 replies: All unread, jump to last
 
User currently offlineBuckfifty From Canada, joined Oct 2001, 1316 posts, RR: 19
Reply 1, posted (11 years 1 week 1 day 19 hours ago) and read 3250 times:

Because to hold more weight at the wingtips means the structual integrity of the wing inboard would have to also increase. Having a tapered wing can reduce the amount of strengthening required, and thus reducing weight.

User currently offlineBroke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 2, posted (11 years 1 week 1 day 18 hours ago) and read 3240 times:

In addition, the lift generated by the wing would be greater on the outer wing panels; resulting in larger moment force causing the wing to try to bend upward more.
But, on many light aircraft the wing chord (straight line distance between the leading edge and the trailing edge) length is constant. This is done to reduce the cost of construction by being able to use the same ribs throughout the wingspan. On these aircraft, the moment force on the outer wing panels is not that great due to the lower speed of these airplanes.
There is one airplane, that I know of, that has inverse wing taper; where the wing chord length is greater at the tip than at the root. It is the Republic XF-91 and the reason was to test the concept that reverse taper might counteract the tendency of the airflow on a swept wing to go spanwise and not chordwise. I don't think it helped. If you want to see what the XF-91 looked like, go to;

http://www.wpafb.af.mil/museum/annex/an.htm

This is a page on the U. S. Air Force Museum web site and they have a XF-91 in their collection.


User currently offlineMITaero From United States of America, joined Jul 2003, 497 posts, RR: 8
Reply 3, posted (11 years 1 week 1 day 16 hours ago) and read 3190 times:

Taper is a more manufacturable way to get a better lift distribution than an elliptical wing is (elliptical lift distribution is ideal). Taper ratios of .5-.6 have been found to be pretty good.

User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 4, posted (11 years 1 week 13 hours ago) and read 3031 times:

Hi MITaero, I see what you mean about making an elliptical wing vs. making a 'regular' wing. I'm not very familiar with the term "tapered". What does it mean strictly? And what does the taper ratio indicate? I appreciate your response!

-Alfredo


User currently offlineLiamksa From Australia, joined Oct 2001, 308 posts, RR: 0
Reply 5, posted (11 years 1 week 6 hours ago) and read 3008 times:

The taper ratio is the ratio of the chord at the tip : the chord at the root.

So a typical cessna has a taper ratio of 1 (ie: rectangular wings). A wing which gets 'thinner' when you are looking at it from above has a taper ratio < 1.


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