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Why Does The 747 Have It's Abnormal Structure?  
User currently offlineLegolars From Denmark, joined Sep 2001, 89 posts, RR: 0
Posted (14 years 1 week 5 days 14 hours ago) and read 3615 times:

allow me for being stupid.

but why is it that it's economic to have a structure like the 747.

I mean, having one like the 777 (or 380 if two floors) seems to be more economic, or am i wrong?

8 replies: All unread, jump to last
User currently offlineSuperfly From Thailand, joined May 2000, 40298 posts, RR: 73
Reply 1, posted (14 years 1 week 5 days 14 hours ago) and read 3576 times:

allow me for being stupid.

We can't allow that! Big grin

Actually I believe the 747 was originally designed to be a military transport and not a passenger jet. The Lockheed C-5A Galaxy won the competition.

If I am wrong, someone correct me.  Smile

Bring back the Concorde
User currently offlineContinentalFan From United States of America, joined Oct 2000, 358 posts, RR: 0
Reply 2, posted (14 years 1 week 5 days 13 hours ago) and read 3536 times:

Yeah, the intent was to have the cockpit, etc., above the cargo area. If you ever see a 747F w/ a nose door, it works pretty well. I remember seeing a pic of a McD heavy lift proposal that looked a lot like the 747 too, only with side opening nose door.


User currently offline174thfwff From , joined Dec 1969, posts, RR:
Reply 3, posted (14 years 1 week 5 days 13 hours ago) and read 3529 times:

Yes, the 747 was origionaly built to hull crap, not people because Boeing thought that supersonic travel was the new generation of travel. But we all know why it's not. ($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$)

User currently offline747-600X From United States of America, joined Jan 2000, 2827 posts, RR: 13
Reply 4, posted (14 years 1 week 5 days 13 hours ago) and read 3518 times:

I've been saying for years that if Boeing wanted to make a bigger 747 they should just stretch the upper deck while keeping the length the same. That would be efficient.

User currently offlineGregg From United States of America, joined Jun 2000, 327 posts, RR: 0
Reply 5, posted (14 years 1 week 5 days 13 hours ago) and read 3509 times:

Ironically enough, the "hump" also produces lift.

User currently offlineLegolars From Denmark, joined Sep 2001, 89 posts, RR: 0
Reply 6, posted (14 years 1 week 5 days 2 hours ago) and read 3425 times:

So that one will see another aicraft (eg. if boeing choose to make a 787 ,380competitor) with this hump is unlikely, because the 380 structure is more economical?

User currently offlineAirmale From Botswana, joined Sep 2004, 391 posts, RR: 1
Reply 7, posted (14 years 1 week 5 days ago) and read 3382 times:

Pan Am helped develop the upper deck concept on the 747 to allow cargo loading from the nose in the freighter version Smile

.....up there with the best!
User currently offlineVirginFlyer From New Zealand, joined Sep 2000, 4579 posts, RR: 36
Reply 8, posted (14 years 1 week 2 days 12 hours ago) and read 3307 times:

747-600X - actually, stretching the upper deck too much will make the aircraft less efficient. Why? Well, when the upper deck was stretched to its current length from what was seen originally, it was found to improve efficiency, because it increased the 'area rule effect'. I am not very knowledgable on this, however I believe it basically means that the fuselage around the wings should be narrower than the rest to achieve better efficiency. So, by having the upper deck extend until the wings, you make use of this area ruling. However, if you exten the upper deck further, behind the wing, then you give up this effect, and lose some efficency.

Perhaps someone with more knowledge of this subject could explain in more technical detail, but I hope this is helpful in someway


"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
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