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How Much Can Upper-Deck Be Streched On 747-400?  
User currently offlineLegolars From Denmark, joined Sep 2001, 89 posts, RR: 0
Posted (14 years 6 months 6 days 11 hours ago) and read 3210 times:

Could boeing quiete easy make a A380 competitor, or is there a limit?

5 replies: All unread, jump to last
User currently offlineRw774477 From United States of America, joined Feb 2001, 1117 posts, RR: 0
Reply 1, posted (14 years 6 months 6 days 8 hours ago) and read 3160 times:


User currently offlineChiuaua From Netherlands, joined Apr 2000, 113 posts, RR: 0
Reply 2, posted (14 years 6 months 6 days 8 hours ago) and read 3140 times:

Not "quite easy". They would have to design the 747 from the start again. That would actually make it a whole new aircraft.

Greetz, Chiuaua.

User currently offlinePrebennorholm From Denmark, joined Mar 2000, 7141 posts, RR: 53
Reply 3, posted (14 years 6 months 6 days 8 hours ago) and read 3129 times:

The 747-400 has come very much to the limit of what the 747 wing can handle. An increased capacity 747 will require a new wing, revised landing gear and all such things - like the 747X proposal which was shelved about a year ago.

The 747X would have been an almost entirely new plane where little more than the 747 fuselage cross section would be reused. (Please do not confuse with the 747-400X which now has been renamed 747-400LR).

Have a look at the A380 wing. It has a 50 feet greater span. It is an entirely different sort of animal, and it has some growth potential for future stretched A380s. Just in case it should be viable to market such a thing in 2020 or 2030 or such.

Regards, Preben Norholm

Always keep your number of landings equal to your number of take-offs
User currently offlineJoni From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 6 months 6 days 7 hours ago) and read 3108 times:

I've got an impression that for aerodynamical reasons, the "hump" in a 747 needs to end at about where the wing is.

Besides, to compete against 380, you'd need to stretch the upper deck both backwards and sideways - and that certainly wouldn't be a mean feat.

User currently offlineTransSwede From United States of America, joined Sep 2001, 1001 posts, RR: 0
Reply 5, posted (14 years 6 months 6 days 7 hours ago) and read 3082 times:

There is also a center-of-mass issue. If the upper deck is extended behind the wing, the plane will become more rear-heavy, forcing them to either A) stretch the fuselage in front of the wing or B) move the wing back a bit,

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