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Lord Nerdlinger, how big are the wheels you are planning on using?
Because the way i am seeing it assuming 4200rpm output, geared 1:3 puts you at 1400rpm on the wheels which is 23.3 rps multiply that by the circumference of your wheels.
If you are using 6 inch wheels that gives you a top speed of 36.65 fps which is way too fast.
I would recomend having a speed of about 10 or 12 fps. Which would mean you would have to gear it 1:10
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