Re: Why not a full length upper deck on a 747-600X

From:         Mark Ingram <markt@mickey.mo-net.com>
Date:         05 Nov 96 04:13:58 
References:   1
View raw article
  or MIME structure

On 28 Oct 1996, Terrell D. Drinkard wrote:

> >> When Boeing originally
> >> streched the 747-200 to the longer upper deck on the -300, the drag of the
> >> airplane actually went down, even though there was more fuselage.
>
> The original 747 had an area-rule drag hit due to the cross-section
> increase then decrease then increase then decrease.  It was not happy.

According to an _AW&ST_ report a few years back, the reduced drag
resulting from this upper deck stretch came as a complete surprise to the
wind tunnel researchers who discovered it (as did the reduction in drag
from the flattened tailcone "stinger" on the the later MD-80 series
aircraft).  Can anyone from Boeing confirm this?

Mark E. Ingram

MarkT@Mo-Net.Com (also mingram@mail.orion.org)