TF-FIW
Topic Author
Posts: 127
Joined: Wed Nov 15, 2000 7:45 pm

Winglets & Wingtips....

Mon Dec 18, 2000 7:31 am

hi there,
can anyone please tell me the difference between:
- winglets
- wingtips
- canard-wings !?

thanx in advance, regards
Ol
 
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VirginFlyer
Posts: 4229
Joined: Sun Sep 10, 2000 12:27 pm

RE: Winglets & Wingtips....

Mon Dec 18, 2000 7:48 am

Ok.

A wingtip is basically what it sounds like, its the horizontal extremity of the wing, and every wing has them.

A winglet is a piece of metal attached to the wingtip, at an angle to the wing itself. These are of very precise design, you can't just slap the things on, the angle needs to be carefully calculated, and the one for the left wing is different to the one for the right wing in the way your left hand is different to your right hand. Wingets have the effect of reducing voritices off the wings, which means that there is less drag. They also effectively increase the sweep and aspect ratio of the wing, without drastically changing its span. A variant of the winglet is Boeing's raked wingtips they are putting on the 767-400

Canard wings are a different kettle of fish completely. They are kind of like the tailplane, except they are forward of the wing, not behind it. This creates an unstable design. With the tailplane behind the wing, when the aircraft pitches up, pressure on the tail plane pushes the tail back up, and returns the aircraft to level flight. However, with canard wings, when the aircraft pitches up, the dynamic pressure on the canards continues pushing the nose up. Thherefore, a small bit of turbulence would very quickly have the aircraft out of control. This is why canard winged aircraft must be computer controlled.
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
 
BH346
Posts: 3164
Joined: Mon Jan 31, 2000 5:50 am

RE: Winglets & Wingtips....

Mon Dec 18, 2000 7:48 am


Click for large version
Click here for full size photo!

Photo © John Johnson


That part of the wing that goes vetical at the end of the wing is a winglet.


Click for large version
Click here for full size photo!

Photo © Scott Leazenby


The wingtip is the end of the wing.


Click for large version
Click here for full size photo!

Photo © Paul Dopson


That thing up front that looks like a small wing is a cunard.

Hope this helps!

Best Regards,
BH346  
Northwest Airlines - Some People Just Know How to Fly
 
TF-FIW
Topic Author
Posts: 127
Joined: Wed Nov 15, 2000 7:45 pm

RE: Winglets & Wingtips....

Mon Dec 18, 2000 8:05 am

good information, thank you...

so winglets can also have a different shape ?

e.g. the one's on B747-400, MD 11, A330 and A340 they nearly look similar, but what about the one's of the Airbus-A32x. These look like quite different and small compared to B747-400, MD 11, A330 and A340.

did the Tu 144 had canard wings ?

once again thanx
Ol
 
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VirginFlyer
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RE: Winglets & Wingtips....

Mon Dec 18, 2000 8:09 am

Yeah, the ones on the A32x are also known as wingtip fences. These dont do anything in terms of aspect-ratio and sweep angle, but they do reduce the vortices like a winglet.
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
 
Qantas737
Posts: 714
Joined: Thu Jul 13, 2000 8:34 am

RE: Winglets & Wingtips....

Mon Dec 18, 2000 8:16 am

Yeah the Tu-144 SST has canard wings up the front. Looks kinda cool from front, like a Praying Mantis nearly   Also the other guys have explained this for u quite well.
 
TF-FIW
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RE: Winglets & Wingtips....

Mon Dec 18, 2000 8:20 am

....ok that's excellent,
 
UAL747
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Joined: Mon Dec 13, 1999 5:42 am

RE: Winglets & Wingtips....

Mon Dec 18, 2000 8:26 am

And, you forgot about the wingtips of the 767-400ER and the 777-200LR/300ER. But, do these act the same way as winglets? I don't see how they work. Can anyone explain?

UAL747
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way
 
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VirginFlyer
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RE: Winglets & Wingtips....

Mon Dec 18, 2000 10:00 am

Yeah, they basically do the same job as winglets. I think the idea behind it was that if you had these things stuck on the end, you may was well use them to produce lift...
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
 
UAL747
Posts: 6725
Joined: Mon Dec 13, 1999 5:42 am

RE: Winglets & Wingtips....

Mon Dec 18, 2000 3:01 pm

But winglets are designed to keep the air moving over the wing from spilling over the sides of the wing, hence, the winglet is angled up so that it makes somewhat of a fence. With the raked wingtips, you don't have this fence, so I was wondering how these increased performance. Also, why do the 747X series have large winglets still, and the 777LR/764ER have the raked wingtips?

UAL747
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way

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