ORIGINAL: w8ye
The Dynatron turns fast enough on 12v -4800 rpm
To run a Dynatron on higher voltage, eg-24v, they just turn too fast (9600) - way beyond the high speed of gas engines
The Miller gear reduction is 4:1 reduction. So to run a Miller on a starter, the result is too slow unless you run 24V.
A Dynatron with a Miller reduction on 24v tuns 2400 rpm which I think is just right with plenty of torque (2720 in lbs). This should start a 100cc engine?
The Megatron turns 2800 rpm on 12v which is just right so I use a 85 Amp Hr 12v battery and big wires on one and is 600 in lbs. Starts a DA 60 just fine.
Never a problem with mine. I start the engines at idle. They only need a light bump and they are off.
You do make a good point about running the Dynatron at full bore tho. If an engine needs more than a second of coaxing, better reprime and try again. If one runs any of these electric starters (powered by a LiPo) at full bore for 10 seconds or more, better check the LiPo voltage after and the how hot the cells are. It's an easy way to puff a LiPo and just might let the magic smoke out