Does any one know how much weight a 2 wire 393 motor can carry?
It depends on what gearing you have it on. A torque gearing will carry more than a turbo or a high speed.
It also depends on the location of the weight relative to the pivot. 393 motors can output a relatively definitive amount of torque, but weight (force) is a different matter.
Another shout out to @jpearman
Look at this thread (and the ones it references)
I try and have the kids stay under 7 in lb of torque per motor. The 393 can go higher but with power gobbled up at a good rate leading to a greater chance of PTC trips.
Thank you all