jettrader
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Boeing 757 Fuselage Cross-section

Thu Oct 17, 2002 9:09 pm


I uploaded a set of 757-200 pics from SFO last year which all show the aircraft at the 01R hold in full profile. What struck me was the difference in the fuselage cross-section forward and aft of the wing. I've not noticed this on any other commercial airliner (ok...we'll exclude those with obviously different shaped fuselages) and wondered why the 757 was built this way.

You can see the difference in these shots...

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Photo © Dean Barnes



View Large View Medium
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Photo © Dean Barnes



Any info gratefully received.

Regards,
Dean Barnes
Life's dangerous. Get a f**king helmet!
 
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DL_Mech
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RE: Boeing 757 Fuselage Cross-section

Thu Oct 17, 2002 9:55 pm

The 727 also has a larger cross section for the rear hold.
This plane is built to withstand anything... except a bad pilot.
 
oxygen
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RE: Boeing 757 Fuselage Cross-section

Fri Oct 18, 2002 1:38 am

Oh yeah......... I haven't noticed this before!

So can anyone answer the reason for doing so ?
 
Duncan
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RE: Boeing 757 Fuselage Cross-section

Fri Oct 18, 2002 3:47 am

The cross section immediately forward and aft of the wing is exactly the same on the 757. The constant cross section extends from Station 440 (the 41/43 section join) to approx station 1480 (just aft of the aft cargo door). What you may be noticing is the difference between wing-to-body (WTB) fairings forward and aft of the wings. The WTB fairings are composite fairings attached to metallic secondary structure, external to the fuselage and doesn't have any mpact on the fuselage cross section.

DD
 
slawko
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RE: Boeing 757 Fuselage Cross-section

Fri Oct 18, 2002 4:47 am

and just to add to that, the 707, 727 and 737 all have the same cross seection..
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timz
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RE: Boeing 757 Fuselage Cross-section

Fri Oct 18, 2002 6:54 am

He meant: 707-727-737-757 have the same fuselage width, not the same cross-section. The depth differs.
 
jettrader
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RE: Boeing 757 Fuselage Cross-section

Fri Oct 18, 2002 5:26 pm


Thanks for that info Duncan.

Ok...maybe cross-section was the wrong term. It is the depth that I see as distinctly different.

Granted the wing-to-body fairings fore and aft of the wing are different...but if you take the edge of the window and resize until it is level with the rear fuselage...there is a very obvious difference in the forward fuselage depth.

Although I see it mentioned that other Boeing aircraft share this feature I don't recall seeing such an obvious difference.

Any more ideas gentlemen...?

Regards,
Dean
Life's dangerous. Get a f**king helmet!
 
timz
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Okay

Sat Oct 19, 2002 2:59 am

Looking at Delta I see what you mean-- the top of the bare-metal seems to run right at floor level, but the apparent depth of bare metal is greater aft of the wing than forward. But I assume it's some perspective effect-- can't believe it's really deeper aft.
 
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VirginFlyer
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RE: Boeing 757 Fuselage Cross-section

Sat Oct 19, 2002 8:10 pm

Timz - are you sure of that? I am certain that the 757 has the same fuselage cross section as all the other mentioned Boeing narrowbodies (though if you give me some evidence to the contrary, then I guess I will be proven wrong, won't I?).

V/F
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Dash 80
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RE: Boeing 757 Fuselage Cross-section

Sat Oct 19, 2002 9:07 pm

Timz is right, same width, different cross-section. The 75 has a deeper belly cargo hold than the 70, 72, and 73.
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timz
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RE: Boeing 757 Fuselage Cross-section

Sun Oct 20, 2002 12:40 pm

Truth to tell, I thought the 707-727-737-757 all had different depths below the cabin floor. Same above, of course.
 
timz
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Finally Looked At Boeing.com...

Mon Oct 21, 2002 3:29 am

...where the 3-views show a 13 ft 2 inch fuselage depth for the 727, 737-300 and 757,and 14 ft 2.5 inches for the 707. I sure thought the 737 cargo hold was not as deep as the others, but...