I just know that when Chuck did his original design of this engine, that he never thought an engineer gone slightly wingy from boredom would use it this way---
This is where I am eventually going with this "Doodlebug". The grey transparent disc is 36" diameter 3/4" plywood. The red tether is a rigid 3/16" diameter rod and goes from the side of the Doodlebug to a post in the center of the plywood disc. You can see that I plan on modifying the front wheels to be on an angle such that the Doodlebug will actually steer in a circle without having to skid as it drives around. The air supply will come up the center of the blue post and then thru a swivel air fitting out to the Doodlebug.