Re: 747 hump

Date:         17 Sep 97 02:49:14 
From:         michael piersdorff <piersdorff.michael@ic.gc.ca>
Organization: Industry Canada
References:   1 2
Followups:    1
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jf mezei wrote:
> But if the hump actually reduces drag, how come other Boeing planes
> which were designed afterwards (767,777) don't have a hump too ?

The 747 was designed to the same spec that the C-5 was: it had to have a
through cargo capability (ie. open doors both front and back).  Boeings
designers chose to accommodate the cockpit in a hump, which is why it's
there.  Lockheed chose a different solution.  If it weren't for that
design compromise, it is doubtful that Boeing's engineers would have
deliberately put a hump there, since the extra frontal area does
increase drag.  The amount it is increased can be alleviated somewhat by
taking advantage of area ruling (as in the -400), even if inadvertently.