Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
747-400 Domestic... No Winglets?  
User currently offlineGV-SP From , joined Dec 1969, posts, RR:
Posted (13 years 6 months 2 weeks 14 hours ago) and read 1591 times:

http://www.boeing.com/commercial/747-400d/product.html

Why doesn't the Boeing 747-400d have winglets? I have heard that the winglets don't really help enough to make a difference, is this true?

2 replies: All unread, jump to last
 
User currently offlineKonaB777 From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 6 months 2 weeks 14 hours ago) and read 1571 times:

What winglets do is break up wingtip vortices, which cause drag. This trick helps increase the range by like 5% or something. The 747-400D flies much much shorter flights, so the "range extending" winglets aren't really needed, as their only purpose on the -400D is adding weight.

User currently offlineMit From United States of America, joined Dec 2000, 166 posts, RR: 0
Reply 2, posted (13 years 6 months 2 weeks 14 hours ago) and read 1567 times:

Yes. The weight penalty of the winglets is only offset on longer flights. (They're deceptively large -- over six feet tall!) The plan of most 747 domestic operators is to use the planes until they have relatively low hours and high cycles. At that point, they can have the winglets added and put into international service where they will accumulate lots of hours but not many cycles.

Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
747-400's With No Winglets posted Mon Apr 5 2004 04:21:36 by Alitalia7e7
Cathay 747-400 With New Winglets? posted Mon Jan 14 2002 17:15:19 by CX747
Boeing 747-400 Domestic Removed... posted Sat Dec 29 2001 21:19:08 by Baec777
Which Airlines Operates 747-400 Domestic? posted Sat Dec 8 2001 12:52:28 by Vtual
How Long Can A B 747-400 Domestic Fly? posted Wed Nov 22 2000 06:39:07 by United Airline
747-400 Domestic posted Wed Nov 22 2000 01:49:53 by Vw
Boeing 747-400 Domestic Version posted Sat Jul 31 1999 01:32:38 by Jubilee_777
747-400 Domestic? posted Mon May 10 1999 14:39:25 by Gnarly
SQ 747-400, Which Ones Are No Longer In Service? posted Tue Jul 25 2006 18:29:40 by SQ772
No More Iberia's 747-400 From July 1st? posted Sun Apr 2 2006 11:44:07 by IberiaA319