legolars
Posts: 85
Joined: Tue Sep 25, 2001 6:39 am

Why Does The 747 Have It's Abnormal Structure?

Tue Jan 29, 2002 12:16 pm

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?
 
Superfly
Posts: 37735
Joined: Thu May 11, 2000 8:01 am

RE: Why Does The 747 Have It's Abnormal Structure?

Tue Jan 29, 2002 12:20 pm

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
 
ContinentalFan
Posts: 343
Joined: Wed Nov 01, 2000 2:47 am

RE: Continental & ALPA: Match Made In Hell!

Tue Jan 29, 2002 1:41 pm

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.

Mike.
 
174thfwff
Posts: 2831
Joined: Thu Sep 04, 2003 12:47 am

RE: Why Does The 747 Have It's Abnormal Structure?

Tue Jan 29, 2002 1:49 pm

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. ($$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$)
Brooklyn, Queens, Manhattan, Staten, Uptown, what now? Lets make it happen.
 
747-600X
Posts: 2492
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RE: Why Does The 747 Have It's Abnormal Structure?

Tue Jan 29, 2002 1:51 pm

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.
 
Gregg
Posts: 313
Joined: Sun Jun 18, 2000 12:49 pm

RE: Why Does The 747 Have It's Abnormal Structure?

Tue Jan 29, 2002 2:07 pm

Ironically enough, the "hump" also produces lift.
 
legolars
Posts: 85
Joined: Tue Sep 25, 2001 6:39 am

RE: Why Does The 747 Have It's Abnormal Structure?

Wed Jan 30, 2002 12:56 am

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?
 
airmale
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Joined: Fri Sep 17, 2004 4:48 pm

RE: Why Does The 747 Have It's Abnormal Structure?

Wed Jan 30, 2002 2:52 am

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!
 
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VirginFlyer
Posts: 3974
Joined: Sun Sep 10, 2000 12:27 pm

RE: Why Does The 747 Have It's Abnormal Structure?

Fri Feb 01, 2002 2:38 pm

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

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