Re: 747 hump

Date:         11 Sep 97 03:35:29 
From:         Arthur Utay <>
Organization: AT&T
References:   1 2
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David Lednicer wrote:
>     Actually, the hump slightly improves the drag of the 747.  If the hump
> wasn't there, the cross-sectional area distribution would have a chunk
> missing and the wave drag would be higher.  I have data showing that the
> extended hump on the 747-300 and -400 improves the area distribution
> slightly, further reducing wave drag.

See Kuethe and Chow, 1976 edition, P.286-287, for a discussion of the
747 area ruling problem and the work of Goodmanson and Gratzer and their
tests on the -200 and (what appears to be) -300 cabs.

A. W. Utay
C180 N180Y
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