Re: Boeing 720

Date:         11 Feb 98 04:24:12 
From:         David Lednicer <>
Organization: Analytical Methods, Inc.
References:   1 2 3 4
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> > Correct, the KC-135/C-135 etc have the same fuselage section as the
> > original Boeing 707 prototype model 367-80 which is smaller than the
> > production 707.  The -135's also have a different wing to the 707.
> > Really there is very little in common between the -135's and the 707
> > apart from appearance and engines.

The 367-80 has a upper fuselage lobe width of 132 inches.  KC-135s have
a 144 inch upper lobe and 707s and 720s have a 148 inch upper lobe.
727s, 737s and 757s have the same 148 inch upper lobe, but
have different lower lobes.

KC-135s and 707-100s have the same wing.  707-320s have a modified
wing, with a trailing edge "Yehudi" and a outboard leading edge
extension.  367-80's wing has been modified so that it now is
representative of a 707-320 (it now also has JT3Ds).  The 720s have a
707-100 wing, with a glove on the inboard area.

I believe that all the 707s and KC-135s that started out with the short
vertical tail were modified to have the taller vertical tail early in
their lifetimes.  I still haven't figured out which 707s did and didn't
have the ventral fin.  There appears to also have been two different
size ventral fins.

The KC-135s and 707-100s had a horizontal tail with a span of 39'8".
707-320s have a 45'8" span horizontal tail.  This has now been
retrofitted to all KC-135s, when they were reengined.  The likely reason
for this was to increase longitudinal stability.

David Lednicer             | "Applied Computational Fluid Dynamics"
Analytical Methods, Inc.   |   email:
2133 152nd Ave NE          |   tel:     (206) 643-9090
Redmond, WA  98052  USA    |   fax:     (206) 746-1299