Halls Rotary Steam Engine Model 1980
This 6:1 Model built circa 1980 by Wolfgang Neubauer of Paderborn, Germany is from a prototype displayed at the Royal Agricultural Society in 1868. The model design is by David Piddington. Drawings and casting kits are available from Reeves Model Engineers.
The following diagram illustrates the sequence of the rotary piston and incoming steam slide valve.