ROGER1 posted:Jeff,
The trick/challenge was the attachment to the crane. I initially had it attached to the legs, but the torqued it. I eventually came up with an aluminum brace between the legs and attached to the " generator trailer". So, any straight ahead motion of the engine translates into straight ahead for the crane.
Roger
Thanks for the hint! I wonder how it would do if you put the gantry crane wheels on a three rail track and pull it straight ahead by one of the legs? Probably still torque. I don't even have a gantry crane yet, but I like see stuff like this as it gives me some ideas as I move forward.