Date: 08 Sep 97 02:03:47 From: email@example.com (Andrew Muir) Organization: Nobody but me References: 1 2
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In article <airliners.1997.2051@ohare.Chicago.COM>, Steven McDowell <Steven.McDowell_nospam@sybase_nospam.com> wrote: >I understand the size problem as being a structural necessity. I am >wondering about placement, though. Putting the windows a little higher >would be nice. An airliner fuselage is essentially a cylinder with internal structure. Thhe skin is reinforced internally with circumferential frames for hoop strength and stringers (running the length of the fuselage) for longitudinal and bending strength. The combination of the stringers, frames and skin work on torsion. The stringers are placed approximately equally around the circumference of the cabin. Windows are placed between stringers and frames, where there is empty skin to penetrate. On the 737, stringers are approximately 10 inches apart. The centerline of the window line is at the stringer 12 location - twelth stringer from the top (Stringer 1 is at the top of the fueslage in the aircraft BL 0 and the stringers are counded down from there - Left side 2L, 3L .. Righte side 2R, 3R ...). To put in the windows, Stringer 12 is replaced by the window forging that runs from stringer 11 to 13. This is done by design, and in actuallity the only place that stringer 12 exists is at the blank window locations just infront of the wing. Now to change the placement of the window vertically stringers 11 & 13 would have to be repositioned and that would screw-up the nice even spacing of structural elements that we engineers love. PLan b would be to increase the diameter of the fuselage to maintine the spacing, not really worth it. So ultimately, structural concerns win out an the passenger just has to bend down to see the clouds outside.