UAL_777_Pilot From United States of America, joined Dec 2001, 81 posts, RR: 0
Reply 2, posted (12 years 7 months 1 week 3 days 18 hours ago) and read 2274 times:
I am a 777 pilot for UAL . The thing about winglets is this , they are only economical for long ranges , but I agree with you , I dont know why the B777 doesnt come with a winglet option , well maybe not just the 777-200 like i fly , but definately on the IGW or the ER's would be most appropriate. Also the B767-400 doesnt really have a "winglet" its more of a "wingtip" a true winglet , is what you would find on a MD-11 , B747-400 , A330 , A340. The B767-400 is a type of wingtip that Airbus uses for its A320 , A321 , A319 and soon on the A380 and the A318. Hope this answers your question!
Jetguy From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 7 months 1 week 3 days 15 hours ago) and read 2226 times:
For what it's worth, I believe that it was Marcel Dassault, the famous French aircraft designer, who said that properly designed wings don't need winglets. I'm not an aeronautical engineer by any means, but I've flown plenty of hours in aircraft with and without winglets and my personal observation is that what ever small performance gains they provide often is usurped by the handling penalties they impose. I would guess the reason why the "Triple 7" doesn't have winglets is because it has a fresh "clean sheet" wing design that just doesn't need them. Winglets have found their place with "old technology" designs. They allow the manufacturers to improve the aerodynamics with minimal redesign costs.