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A concentric reducer is used to join pipe sections or tube sections on the same axis. [1] The concentric reducer is cone -shaped, and is used when there is a shift in diameter between pipes. [ 1 ] For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. [ 2 ]
A Veco .19 engine was chosen for its ability to deliver power at any given RPM. Bill experimented with a 4:1 direct drive gear ratio and finally settled on a 6:1 ratio. Using 3 + 3 ⁄ 4-inch diameter rear tires, Bill achieved a 600 to 2,500 RPM range resulting in speeds from 6 miles per hour to 29 miles per hour.