B-777(why no winglets?)
Joined: Apr 2000
Posts: 562
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From: UK
Covered a hundred times before!
Cos it's a newly designed wing that doesn't require them, ie it's efficient without them.
Presumably you've been looking at a 744 or MD-11, well they're just new variations of an old design, therefore bung a winglet on either end to make something more efficient than it used to be.
If you want a technical answer, do a search.....
Cos it's a newly designed wing that doesn't require them, ie it's efficient without them.
Presumably you've been looking at a 744 or MD-11, well they're just new variations of an old design, therefore bung a winglet on either end to make something more efficient than it used to be.
If you want a technical answer, do a search.....
Joined: May 2004
Posts: 112
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From: According to my GPS... 5981NM from Dubai... too far to drive!
Actually studying Aerospace Engineering, winglets don't do exactly what they say they do. If anything, the raked winglets on the 767-400 and 777-300ER reduce drag and increase range.
Joined: May 2004
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From: According to my GPS... 5981NM from Dubai... too far to drive!
But it is a good way of convincing those airline suckers to pay big bucks to install them. If anything its a good way to advertise your airline for your passengers. There is some turbulence they will look outside worried only to be calmed by staring at the logo of the airline they are flying on 
Joined: Mar 2001
Posts: 2,335
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From: Wet Coast
The 777 wing was also designed to fold so as to fit in with existing airports' infrastructure. In the event, no airline chose this option, as it has proved to be unnecessary. Whether folding would have been practical with winglets or not I can't say. Someone ?
And I see Continental intends to wingletify their 757s. Be interesting to see if that affects the gnarly vortices one way or the other.
And I see Continental intends to wingletify their 757s. Be interesting to see if that affects the gnarly vortices one way or the other.
Joined: Nov 2001
Posts: 358
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From: uk
A bit off thread, but I was in Nairobi recently and saw some Kenya Airways 737's with winglets: they were -700's, but their registration letters were in the same sequence the other, un-wingletted KQ 737's, so presumably a retrofit.
The winglets seemed to be at least 2 metres long and seemed quite out of proportion to the size of the aircraft.
Would appreciate any replies as to the benefits of "outsize" winglets. Also, I understand that the benefit of winglets is mainly experienced in the cruise, so how cost-effective are they for short haul operations?
The winglets seemed to be at least 2 metres long and seemed quite out of proportion to the size of the aircraft.
Would appreciate any replies as to the benefits of "outsize" winglets. Also, I understand that the benefit of winglets is mainly experienced in the cruise, so how cost-effective are they for short haul operations?
PPRuNe Supporter
Joined: Mar 2000
Posts: 194
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From: Devon, UK
The original question was why does the 777 have no winglets. I don't buy the "Boeing made a super duper wing" theory..why does every new design aircraft have winglets (even Boeing offerings) and the 777 does not?
