Re: Was there a 717 ...

From:         ami@cac.washington.edu (Analytical Methods {NWNet})
Organization: UW Networks and Distributed Computing
Date:         11 Sep 93 13:45:55 PDT
References:   1 2
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	After reading all of the news postings attempting to make sense
of the early Boeing model numbering system, let me set the record
straight.  Model 367-80 (the prototype) begat the Model 717 (USAF
KC-135) quite directly, though the upper lobe on the -80 is 132 inches
wide and the 717 has a 144 inch upper lobe.  All model of the 707 and
720 have a 148 inch upper lobe.  The extra 4 inches was added to make it
competitive with the DC-8.  The 707 was produced in several models.  The
707-120 and -220 had a 1666 inch long fuselage, while the one-off -138
and the Model 720 had a 1566 inch long fuselage.  The Model 720 has a
glove on the inboard wing which helps it cruise approximately .02 Mach
faster to make it competitive with the Convair 880 and 990.  The Model
707-320 and -420 had a longer fuselage (1746 inches) and a revised wing.
The -120 had JT3C turbojets, the -220 JT4A turbojets, the Model 720 had
JT4As, the -300 had JT4As and later JT3Ds and the -420 had Rolls Royce
Conways.  Lastly the Model 717 had J-57 turbojets (JT3Cs), though they
have since been reengined with JT3Ds and CFM-56s.  By the way C-137s and
E-3s are basically 707-300s with JT3ds, while E-6s are 707-300s with
CFM-56s.  Got all that?


				-David Lednicer
				 Analytical Methods, Inc.