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to get lots of torque, like you want to play king of the hill, you need your drive train geared way down
if you gear a motor way down then you cant drag it up to a higher speed with a second motor - it can only go so fast and that is your top speed
to go fast you need to be geared up - to have both on your drivetrain you need a transmission that can shift gears, or a variable speed transmission.
Using this one way 'ratchet' clutch idea lets you have two motors, geared at the oppose ends of torque and speed, without the need to shift gears on the fly, or to stop and shift gears.
thats why! :c)
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