This model has no castings. I was instrumental in getting these plans published on our Yahoo Group, Radial and Rotary Engines, so all our members have access to a set of drawings for this engine. One of our members, Robert Siegler re-drew them in CAD. Although a later model had spark ignition, this model uses glow plug ignition. Note the ruler at the bottom of the picture to give you an indication of the size of this engine. Unlike the Gnome, the engine remains stationary and the crankshaft rotates within the engine like any conventional radial.