Heavy Lifting Servo - Not too expensive?

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hello! creating robot. robot transportation, carrying pound of weight. going use 2 of these motors wheels, , small caster ball-wheel (not motorized) in front.

then thought 2 of motors not able carry pound of load. (even @ top speed) wrong? if so, kind of motors looking for? want robot travel @ reasonable rate, move around room.

any ideas?

also, robot needs turn, more 1 motor on each side of bot may prove challenging.


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