Re: T-Tailed aircraft

From:         David Lednicer <dave@amiwest.com>
Organization: Analytical Methods, Inc.
Date:         13 May 96 02:08:48 
References:   1 2
Next article
View raw article
  or MIME structure

> According to Peter Bowers, _Boeing Aircraft Since 1916_, the original
> design studies for the 757 was to be the 727-300, which, after a great
> deal of study, was abandoned and replaced by the 757 concept, which
> was, indeed, to have used the T-tail of the 27; as studies continued,

	The 727-300B actually came very close to getting a production
order from United Airlines.  It would have had 20ft fuselage stretch,
four wheel gear trucks, JT8D-200s, and some wing mods, including a change
to slats inboard and variable camber Kruegers (ala 747) outboard.  When
United didn't bite, Boeing went back to the drawing board.  The original
757 (model 761-161) had a 707/727/737 fuselage, a 707/737 derived tail,
an all new wing and wing mounted engines.  From here, the model 761-164
was developed, as a T-tailed 727 derivative, with wing mounted engines.
This quickly evolved into the model 761-177 and then the model 761-280,
when the T-tail dissapeared.  Very late in the going, the 767 cockpit was
grafted onto the design, and the drooped nose appeared.  This happened so
late that the revised nose was only wind tunnel tested after the first
metal had been cut.  CFD was used to fine tune the nose contours before
the lines were frozen for production.  The result of all of this is the
757 we all know today.

	BTW - Phil Condit, now Boeing Prez and CEO, was the Director of
Engineering, 757 Division.  A good technical paper written by him,
describing all of this, appeared in the Aeronautical Journal, in December
1981 as "Design Evolution of the Boeing 757".

-------------------------------------------------------------------
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