This is another one of Elmer Verburg's designs. The valve actuator is a swash plate mounted on the crankshaft. It drives a pivoted lever which, in turn, drives the piston valve in the steam chest on the top of the cylinder.
Construction of the swash plate element was somewhat fiddly and I had to design a jig to hold everything in the right orientation while it was soldered.
The engine, with its unusual "monkey motion" draws lots of attention at shows.
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