mclintock

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A possible source of toothed belts and gears to tinker with is inkjet printers. The platen or drum is turned on many models by a toothed belt, altho some may use a worm gear.
Speaking of worm gear, I've sometimes wondered if a worm gear system would work for a gear reduction drive using cox engine(s).

I once had a cox 'sandblaster' dune buggy that used a crude worm gear- the engine drove a plastic shaft with a helix of wire wrapped around it to form the worm, and that meshed with a moveable plastic gear on the car's axle. It worked fine- Pretty extreme ratio though, maybe more like the kind of thing to use in a helicopter. Hey there you go, look at the lite machines heli site and see what they are using.