I was thinking of something like a
HS-785HB sail winch servo. It runs
3.5 turns which with a 1.5 inch drum
would give about almost 16 inches of
cable travel.

In a 60-120 size plane there should be
plenty of room behind the wing to
run a weight back 16 inches to the
tail. The servo wouldn't have to be
installed in the rear, just where it
or the cables would not interfere with
any other workings. Elevator and
rudder servos and their pushrods would
be installed close to the turtledeck.
Sail winch servo, cables weight and
return pulley installed close to bottom
of the plane. The weight could slide
on a carbon rod if necessary.

I was hoping someone had already done
this so I could get some feedback about
what problems were encountered. Since
no one responded with anything remotely
like this, its likely this will be an
all original design.

It will take some time for me to work
out the details and construct everything,
so don't expect it anytime soon, maybe
next summer if everything goes well.
I also have other ideas and projects
I'm working on, so it may be even later.

Jenny