VirginFlyer From New Zealand, joined Sep 2000, 4579 posts, RR: 39
Reply 1, posted (14 years 5 months 2 weeks 11 hours ago) and read 3628 times:
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
TF-FIW From Germany, joined Nov 2000, 131 posts, RR: 0
Reply 3, posted (14 years 5 months 2 weeks 11 hours ago) and read 3611 times:
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.
UAL747 From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 5 months 2 weeks 4 hours ago) and read 3577 times:
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?