Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

And now the final display item on the table.  It's not quite done yet, but it's close enough...

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Finished building a PM Research number 3 steam engine awhile back and while it runs great on air, what fun is that?  Steam engines should eventually run on steam.

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This is my PM Research/Jensen hybrid, or the PM 3G.  It's using a Jensen 2.5" electric fired boiler which powers a PM Research Number 3 engine.  A PM Research dynamo provides a load.  All the plumbing is PM Research, with the pipe and fittings (except for the valve) machined and threaded in my shop.  The engine and dynamo were also my work from the casting kits.

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The boiler came from my very first Jensen, a used 25 I bought years ago.  Since I have two other 25's, this one wasn't seeing much use anymore so I pinched the boiler for this project.  The PM dynamo was built awhile ago and being used as a standalone accesory and that also was grabbed.  I probably will build another dynamo later.  The light post was bought as a Jensen spare part.



When I mentioned doing this project last year, I was told the boiler would provide plenty of steam for this engine and they were 100% correct, when not running the dynamo you need to turn down the heat with a triac or variac or the safety valve will blow quickly.  The PM dynamo is a pretty good load for this size of engine, but it seems to be working well and actually better than I thought as a Jensen 25 has it's hands full with the same load.