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Why No Winglets On All Aircraft Types?  
User currently offlineSEVEN_FIFTY7 From United States of America, joined Sep 2000, 957 posts, RR: 4
Posted (12 years 8 months 3 weeks 1 day 18 hours ago) and read 2317 times:

No winglets on the 757-300 (as well as newer deliveries of the -200), none on the 767s except the -400, none on the 777s, and none on most of the 737NGs.

We know the main purpose is to reduce drag, but wouldn't this principle work on ALL aircraft?


?????

4 replies: All unread, jump to last
 
User currently offlineBWIrwy4 From United States of America, joined Nov 2001, 940 posts, RR: 1
Reply 1, posted (12 years 8 months 3 weeks 1 day 18 hours ago) and read 2305 times:

There are tradeoffs, though. "Wingleted" wings are heavier than conventional wings, so it's a matter of preference. Winglets look great, though.

User currently offlineUAL_777_Pilot From United States of America, joined Dec 2001, 81 posts, RR: 0
Reply 2, posted (12 years 8 months 3 weeks 1 day 18 hours ago) and read 2310 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!

User currently offlineCV640 From United States of America, joined Aug 2000, 952 posts, RR: 5
Reply 3, posted (12 years 8 months 3 weeks 1 day 16 hours ago) and read 2281 times:

Winglets only help in longer arnged flights as mentioned above. Otherwise they do add weight and are expensive, just over $750,000 for a set on the CRJ. So, don't want to ding one of those

User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 8 months 3 weeks 1 day 15 hours ago) and read 2262 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.

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