Re: MD-11F vs. 747-400F Design Philosophies

From:         Imran Haq <>
Organization: Massachvsetts Institvte of Technology
Date:         14 Mar 96 17:49:34 
References:   1 2
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>I've seen a number of these
>as well, and I'm puzzled about Boeing's decision to use the standard
>-100 and -200 upper deck instead of the stretched upper deck used in the
>passenger variant.

Although weight is a concern, I would have thought that the SUD adds a
aerodynamic benefit that would counter some of this weight penalty. One the
passenger side, the SUD aircrafts are somewhat more efficient than the
-100 and -200 versions (though the exact % benefit excapes me right now).
The SUD's benefit can probably (if crudely) explained using the transonic
area rule.

Imran Haq