Even the propellor was created with a hammer and a welding set along with a bit of imagination. And after a few de-bugging voyages, it behaved perfectly. Made from 6mm marine ply, mahogany and pine. External surfaces sealed with an epoxy system applied woven glass fabric. Finished in simple oil based paints.
Draught is induced by engine exhaust steam.
Test pressure 250psi. Me and my dad setting off on the very first voyage. At this time the engine's exhaust steam was disposed of to atmosphere through the side of the hull via a feed water pre-heater. Using the waste steam to induce draught through the boiler was found to be much more beneficial. The engine incorporates all that I have learned about structural integrity and bearing life along with simplicity of design and manufacture.