Throttle control

Designing the throttle control for my simulator has been a challenge. I’m using a rotary potentiometer to capture the motion of a linear throttle. There are linear potentiometers but I would have to spend time adapting those anyway to the throw and I have plenty of rotary ones.

What I had to do is convert 70mm of travel on the throttle to the full rotation limits of the potentiometer. I accomplished this by transferring the motion to a sprocket using an arm, then geared down to the potentiometer using a belt. I tried using direct gear drive using 3D printed gears but there was a lot of lash and it was hard to get the unit to be solid enough. The 6mm timing belt works great.

  • 1971 Cessna 172 L model
  • 70mm total throttle movement (measured on actual plane)