Re: T-Tailed aircraft

From:         Geoff.Miller@Eng.Sun.COM (Geoff Miller)
Organization: FizzBall Racing
Date:         13 May 96 02:08:48 
References:   1
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"John O'Brien" <> wrote:

> I know that in the late 70's the first designs of the
> 757 had a T-Tail but that this was later replaced by
> the normal fin and lower tail-plane. (NOYDB) replies:

> Since the 757 is the replacement for the 727 airframe you are
> probably referring to an early test bed or proof of concept
> airframe.

John is correct.

Back in the 1970s, before the 757 and 767 designs were frozen,
their general concepts were given the working designations 7J7
and 7X7, respectively.  I remember seeing drawings of some early
versions in AvLeak at the time.

The 7X7, as I recall, evolved into the familiar 767 shape rather
quickly.  The 7J7, on the other hand, went through a more extended
evolution.  It originally had the fuselage of the 727 with two
engines under the wings, and a third buried in the fuselage 727-style
-- but with a difference.

Instead of the 727's circular (or oval) intake on top of the fuselage,
the design employed a pair of rectangular intakes high on either side
of the aft fuselage; they were located at approximately the "ten
o'clock" and "two o'clock" positions.  Also, the design employed the
727's familiar T-tail empennage assembly.


Geoff Miller			+ + + + + + + +        	     Sun Microsystems
geoffm@purplehaze.Eng.Sun.COM	+ + + + + + + +     Mountain View, California