Re: Flying Pencils (was:What's wrong with MD-11?)

From: (Richard Shevell)
Organization: Stanford University, Dept. of Aero/Astro
Date:         16 Nov 95 03:48:41 
References:   1 2 3 4
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In article <airliners.1995.1762@ohare.Chicago.COM>, (Brian A. Reynolds) wrote:

> Karl Swartz wrote:
> The MD-80 has a very distinct crease where its two lobes join.
> ----------------------------------------
> The two lobes are joined by the floor panels.  The design of the upper
> lobe allows for maximum fuselage diameter at the PAX elbows.  While this
> was good for the passengers, it did result in a very labor intensive
> manufacturing process.
> I believe one of the significant benifits to Douglas on the MD-95 is that
> it IS a circular cross section, allowing automated manufacturing processes.

All DC-9's, MD-80's, MD-90's and the MD-95 have identical fuselage cross
sections.  They are a 'double-bubble' design.  The portion above the floor
has a circular cross section down to the floor.  The portion below the
floor has a circular cross section up to the floor. The radii below and
above the floors are different.
Richard Shevell