Slcpilot
Posts: 568
Joined: Thu Aug 07, 2003 3:32 am

7E7 - Constant Cross Section?

Sun Jul 11, 2004 1:12 am

Howdy!

Some early concept pictures and diagrams seemed to imply the 7E7 would have an "area-ruled" bulge in the forward fuselage. Is this still in the works? To me, this would almost be as distictive as the "shark tail", but might make stretches of the design more difficult.

Also, will the fuselage be of a filiment wound structure like the Raytheon Premier or a more conventional "laid up" composite? Either way, it will be a hugely different design aspect that many of us in this forum have overlooked.

SLCPilot
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Type-Rated
Posts: 3901
Joined: Sun Sep 19, 1999 5:18 am

RE: 7E7 - Constant Cross Section?

Sun Jul 11, 2004 1:17 am

This "bulge" could possibly be the "Attrium" or a "clear space" entry area on the 7E7 where passengers would enter. Think of the entry area on a cruise ship. The ceiling in this area is concave and higher than the surrounding ceiling area.

After all, this is the Dreamliner
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Sinlock
Posts: 1631
Joined: Fri Dec 22, 2000 12:55 am

RE: 7E7 - Constant Cross Section?

Sun Jul 11, 2004 1:59 am

The curves in the top of the fuslage is a trick of the eye. The picture thats most famous for this has two aspects that make this happen. The sweeping curve of the "Cheat Line". And the sun glare thats been added to the top of the body. If you hold a piece of paper to the picture you'll see that the top is pretty much stright.


95% of the composites will Pre-preg. There will be a mixture of Laid-Up and Wrap Cured. The laid-up fiber will be the same thats used on the 777.

During a recient Boeing Teli-confrence it was stated the 55% of the 7E7s weight will be Composite. (With Engines)

By makeup of the structures about 85% of the 7E7 will be composite, 15% Metal and other materials. The 777 on the other hand is 12% composite by volume. (Green Aircraft, No Engines)
 
DfwRevolution
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RE: 7E7 - Constant Cross Section?

Sun Jul 11, 2004 2:00 am

This "bulge" could possibly be the "Attrium" or a "clear space" entry area on the 7E7 where passengers would enter

I'm not so sure. The entrance Atrium could simply be a portion of the ceiling raised into the crown, without requiring a change in fuselage profile. Especially in widebody aircraft, there is a sizeable empty "attic" above passenger's heads. It makes more sense to take advantage of this area before modifying the fuselage.

Is this still in the works? To me, this would almost be as distictive as the "shark tail", but might make stretches of the design more difficult.

I could never see this when I looked at the concepts, but maybe my eye is not discerning enough. In any event, we'll know when the design is finalized.
 
frugalqxnwa
Posts: 550
Joined: Sun Apr 25, 2004 3:18 am

RE: 7E7 - Constant Cross Section?

Sun Jul 11, 2004 8:13 am

Surely it will be a constant cross section after the nose, otherwise they will run into some of the same problems Lockheed ran into with the Constellation. A continuously changing cross section does not make for a good interior.
 
lehpron
Posts: 6846
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RE: 7E7 - Constant Cross Section?

Mon Jul 12, 2004 10:14 am

>> "A continuously changing cross section does not make for a good interior. " <<

If you suppose so... Insane

Is 'good' the appropriate word in this case? Airlines ultimately decide seating arraignments in the interior cabin. How many passengers care for interior other than getting to a seat?
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