Re: Boeing 720

Date:         24 Jan 98 14:47:00 
From:         David Lednicer <>
Organization: Analytical Methods, Inc.
References:   1 2
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According to Bill Cook's book, the 720 started out as answer to the
Convair 880/990.  By modifying the 707 airframe, a higher cruise speed
resulted.  The wing was modified by adding a leading edge glove, that is
reputed to be worth M=.03 in cruise speed.  The airframe is also
lighter.  The 720 has a higher cruise altitude than the 707 series,
which is why they are so popular now as testbeds.  P&W Canada and Allied
Signal both operate 720s as engine testbeds and Boeing operates (or
operated) one as an electronics testbed.

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