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Well you could very well make a "haulchair" out of a power wheelchair. :-) You start with a frame/motor/battery/control that works, and alter the structure to be a place where you can put stuff. The welding part sounds like a piece of cake for you. Converting the controls would depend on the wheelchair controls. Likely, though, that it would be not be a difficult task.This sounds like a great project. Consider taking a lot of photos as you go.
As for controlling with the pistol grip TX, you could hook up a V-Tail mixer for RC airplanes. That way, when you pull on the throttle, the two motors will both go forwards (or backwards). But when you turn the steering wheel, they will go in opposite directions.
I know you saw my yard robot, since you posted there.I convert the 2-channel R/C output from my receiver to a serial command to the Dimension Engineering Sabertooth 2X25 motor drive (and a dual PWM signal for an H-bridge if used). This is implemented on a PIC 16F876A microcontroller. I put quite a bit of thought and experimentation into accel/decel control and signal loss detection. Do you have any microcontroller experience? Let me know if you want the C code.
Started by dcole07
Started by Gryffindor90
Mechanics and Construction
Started by megaman935
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Started by robonoob