"Jim Vincent" wrote in message
...
What about the pilatus B4 then?

It has a T-tail too;-)

Seriously, every design is a trade off between structural weight and
performance issues such as wetted area and configuration.

The B-4 is an aerobatic glider with very good glider performance, about
35:1.
It has a shorter distance from wing to tail compared to most gliders and a
larger cross section. That allows the structure to handle the torsional
forced
induced by the T-tail. In fact there are two models, one for limited
aerobatics, the other for full. The main difference is a stiffening plate
at
the tail.

Jim Vincent
N483SZ
illspam

There are actually 3 variants 4 if you count the fixed U/C one
they are
B4 PC11
B4 PC11A
B4 PC11AF

Peter.