Originally Posted by UNCIVILIZED
Such setups are quite common in some circles. And it was how servos were sometimes connected to the rudders on remote controlled aircraft when I was a kid. Possibly called a bellcrank connection? That was a long time ago. But the principle is still more than valid.
Edit: Yep, it's Bellcrank, I just looked. Bing it for some more pics & info. https://en.wikipedia.org/wiki/Bellcrank
Being an active RC pilot for 45 years I can say that bell ranks were
rarely used for rudder. There most common use was in the wings
where the servo was positioned in the center of the wing and pushrods
went through the wing, then attached to 90* bellcranks
the resulting pushrods coming off the 90 then were connected
to the airelons. One servo then controlled two surfaces.
Left and right airelons,
With radios and servos getting much cheaper
and with radios now having all sorts of digital programming,
It's now usually one servo for each movable service
The servos are mounted as close as possible to the
surface being controlled. Eliminates a tremodous amount of
slop and flutter.
Makes set up and trimming a breeze.
I also fly control line and here bellcranks are used to convert
relative pull on the flight wires to elevator control.
To the OP question
A few years ago I was crew on a boat that had a Jaffa unit
(Sorry don't remember model)
That looked and behaved just like a
Giant RC servo, could be just the ticket
Wikipedia is incorrect
In there example what they are calling a bellcrank
Is actually two "control horns" connected to a
Pull Pull Sytem