Bill Sondagh's Engines
Bill lives in a village near Maastricht in the south of the Netherlands, and as you can see from the photos below is a fine craftsman. here you see a selection of his engines (click on the photo for a larger view)
His twin flame licker is patterned after Richard's Dos Pyros, and the one on the left of the photo is similar to one shown in Home Shop Machinist magazine some years back. The Stirling engine on the right is Bill's BISON, which you see below in action (if you have an animation capable browser). The upper engine I will call his "Mystery Engine" pending Bill's providing more details of its design and operation.
Bison1 Stirling motor on animation running.