Puckett, "Ranger developed a system of air cooling all cylinders to a high degree of uniformity.

The system employed air under pressure, admitted through an opening in the front of the engine cowling.

The tunnel, with one side fitted with corrugations, directed the air against the cylinders at relatively equal pressure and volume.

This gave remarkably balanced temperature range in level flight..."[1] The Chromoly crankshaft with moveable counterweights on the rear to control torsional vibration.

The alloy steel forging camshaft was bolted to the cylinder heads, and driven by a vertical drive shaft.