Duke has been working on its axial engine design for 17 years. The prototype looks nothing like a conventional internal-combustion engine from the outside, and the differences extend inside the cases as well. Five conventional, 200cc cylinders are arranged around the engine’s centerline—with the cylinders parallel to the crankshaft—like chambers in a revolver, for a total displacement of 1,000cc. There are no camshafts, pushrods, rocker arms, valves, or springs—a series of sliding seals similar to a rotary engine take care of intake and exhaust duties. The cylinder group rotates counter to a “Z” crankshaft, at roughly 20 percent of the crank’s rotational speed, to significantly reduce vibration and torque reaction. Power output is competitive; the firm claims 125 hp and 88 pound-feet of torque at 7,500 rpm, the maximum engine speed.