Re: 747 hump

Date:         10 Sep 97 19:38:44 
From:         "Mark E. Ingram" <>
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On 8 Sep 1997, Marc Schaeffer wrote:

> I wonder to what extend the hump of the 747 contributes to the total
> fuel consumption at cruise speed and cruise altitude. Can the
> aerodynamical disadvantages of the 747-hump be evaluated by some
> formula?

An _AvWeek article of three or four years ago stated flatly that Boeing
aerodynamicists were totally surprised when the longer hump of the first
"extended upper deck" 747 (the -300) caused a *decrease* in drag over the
original design.  Can anyone comment on (or verify) this?

Mark E. Ingram

MarkT@Mo-Net.Com (also