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Tony Wright Polly

2016





Polly is one of Tubal Cain's designs, as published in "Building Simple Model Steam Engines".

The vertical boiler is 54mm diameter x approx 73mm tall, made of copper. It has a single flue to the chimney and a safety valve. There is no burner, as such, the intention being that solid fuel tablets are placed on the base under the boiler. This, of course, can only be done with tablets and a burner will have to be provided for use with any other fuel.

The steam feed goes directly to the back of the port face. The single acting oscillating cylinder is 7.5mm bore x 18mm stroke. The crankshaft has a disk crank. The flywheel is 37mm diameter, turned in brass incorporating a small pulley.

Make Tony Wright
Model Polly
Made 2016
Description Stationary
Cylinders 1
Cylinder Type single acting
Piston Diam mm 7.5
Stroke mm 18
Valve Type Oscillating Cylinder
Boiler Type Vertical, single flue
Fuel Tablets
Mechanical Condition Good
Cosmetic Condition Good
Paintwork N/A
Packaging
Purchased 4/5/2016
Purchase cost 53
Additional cost