I finally got myself over 24 mph, Peter! Have a look, and it was with a Torque Tuned 540 and very small wheels, even...
It's not really cheating, but it is also a bit of a loophole? Is this speed accepted?
Anyway, whether you are in a speed challenge, or you just want to go fast for some other reason, I sort of documented how I achieved this crazy tall gearing, low gear ratio:
The modifications to gearbox are pretty modest, just a couple holes to drill, no grinding needed.
I calculated the new gear ratio, it is now 2.8 instead of the 8.3 that a 19 tooth pinion normally results in.
That's pretty steep, so I didn't use a fast motor, but just the old Torque Tuned 540. I will later try with a 12 turn 550, but not just yet.
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