William From United States of America, joined Jun 1999, 1352 posts, RR: 0
Reply 4, posted (15 years 2 months 19 hours ago) and read 757 times:
I remember reading about this in a Popular Mechanics back in the early 80s. Its an idea that has been kicked around for some time. Why they have not done it yet? Who knows,could be airframe problems. If Boeing is to extend the "the Old Lady",it should go ahead with its 747xx project. Using parts from the 777 and lengthening the fuselage. Heck,they might call it 747 NG.
L_188 From , joined Dec 1969, posts, RR:
Reply 5, posted (15 years 2 months 17 hours ago) and read 745 times:
It is an idea that has been kicked around ever since the 747 just existed on paper. The proplem is that it would cost more to develop and to tool the factory then it would to just strech the airplane. Every frame aft of the current hump would have to be redesigned and that is where the increased cost comes into play.
Hmmmm... From Canada, joined May 1999, 2109 posts, RR: 5
Reply 6, posted (15 years 2 months 8 hours ago) and read 738 times:
In addition to the frames having to be all new, and they would all have to be new, as stretching the upper deck would affect the ones in the present hump too, as the present upper deck tapers off from the front to the back, the significant increase in weight would necessitate an all new wing, which is another big ticket item. They would end up with the cost of making a new airplane. The upper deck is quite small. It is only 6 seats abreast in economy, and even that is cramped. They could get the same extra seat capacity by stretching it, and that route would be more feasible.
An optimist robs himself of the joy of being pleasantly surprised
Ilyushin96M From United States of America, joined Sep 1999, 2609 posts, RR: 12
Reply 8, posted (15 years 1 month 4 weeks 1 day 4 hours ago) and read 715 times:
It's interesting no one has mentioned the problems created by the oblong shape of the 747 forward fuselage. Older 747s have to undergo extensive overhaul and strengthening of the frames and stringers for that section because, as I read somewhere, "Mother Nature prefers curves rather than flat surfaces." Hence the structural failures which have occurred, albeit not often (UAL 747-200 out of Honolulu having part of the forward cabin wall disintegrate, for example). This leads me to wonder if the design of the 747 is not dated.
Regarding the 777-300, it is indeed the world's largest airliner by virtue of its length. The 747-400 exceeds it in passenger capacity.