Looking for a tricopter YAW mechanism, with a metal gear servo.
Not up for trying David Windestal's nose wheel steering mechanism idea(have tried and failed miserably at that).
Please pm or whatsapp me on +918967922034
Would this work: http://www.quadkopters.com/product/diy-parts/easycopter-tilt-motor-mount/ (http://www.quadkopters.com/product/diy-parts/easycopter-tilt-motor-mount/) ? You can add your chosen servo to it.
do not use a metal gear servo - they develop slop very fast(unless you are planning
on spending big bucks)
for a normal sized tri - a HXT900 is adequate.
look around the robotics forums - I would suggest a pulley driven
toothed belt with the servo located inward (or a pull pull mechanism)
this way when you hit the ground - your servo is isolated.
you get the added advantage of more equal weight distribution.
tris are my favorite type of multirotor and I'll post pics of mine in a couple of hrs.