I'm engineering a small (~2 kg and less than 0.125 square meters) vehicle that can traverse sand. I've calculated that my four-wheel vehicle will need two drive motors with at least 30 N-cm (= 43.133 oz-in) of output torque and 20 rpm output speed in order for my vehicle to travel at 10 cm/s which is the average speed I want it to travel at.
I'm having a really difficult time finding suitable brushed, DC motors for my needs, and I want to avoid implementing a gear transmission system if at all possible.
I may end up buying a motor from VEX Robotics that has 167 N-cm of stall torque and 100 rpm no-load speed. Is this an OK thing to do? Can I run these motors at the operating point I need them at or should I just keep looking for a better motor?