747-100 vs. -200

Date:         05 Jan 98 23:41:29 
From:         David Lednicer <dave@amiwest.com>
Organization: Analytical Methods, Inc.
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I think I have figured out a way to tell a 747-100 from a -200 (short
of looking at the mfg. plate), but I am curious if anyone can punch a
hole in this.

	I originally noticed that some 747SPs originally flew with a fairly
simple engine pylon, where the trailing edge starts right at the end of
the core cowl and goes up to the wing in a straight line.  All 747SPs
eventually had a modified pylon, where the trailing edge was a generous
curve, staying low before ascending to the wing.  Additionally, where
the outboard pylon meets the wing was extensively modified with a
fairing that goes over the wing leading edge and is almost vertical on
the inboard side and curved on the outboard side.

	Since then, I have noticed that full-length 747s have both pylons.
Late model -300s and -400s (at least P&W powered ones) have the later
747SP pylon.  Earlier -100/-200s seem to have both pylons.  My guess is
that the -100s are the ones with the earlier pylons, while -200s have
the later pylons.  Can anyone confirm this?

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