Looks like 4-1 ratio. So if the outside are spinning at 20,000rpm the big gear would spin at 5,000rpm. However the torque would be multiplied by 4. Remember torque is the actual power. This would have some serious oomph.
There we have it! I see gears
Twin motors, coupled to a single fixed drive shaft - my sentiment entirely (no opportunity for them to run out of sync)
It looks to be a 3:1 (20 tooth to 60 tooth - but who's counting ) and the torque would indeed be tremendous!
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