I'm planning on making my own Segway. My biggest design problem right now is my motors. I need to find the torque needed to move them. I'm thinking an equation like this would use the radius of the wheels, the mass of the rider, etc. How do I find the torque needed to move this Segway? Bonus points if you can point me to a place to get one of these motors. I don't want to spend more than $20 each for the 2 motors. Thanks.

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The Segway claims to have 2hp available.

There are 746 watts to the hp

Your not going to get that for $20!!

Apparently to buy the parts off the shelf you looking at about half the cost of buying a Segway so i would start saving or make a model.