So Ive just completed my first steam engine project, a Stuart S50 and in the process of looking at boilers, but how do you determine the optimum size of steam tube in relation to both an adequate supply of steam vs a good scale size? Is there a good book out there that goes into this sort of thing? Also anything that describes what correct steam fittings to use and what layout? Ive already determined that I will need a displacement lubricator and some sort of steam valve or regulator between the boiler and engine (globe valve?) but what sizes are appropriate for this size of engine? Sorry if its a daft question but Im a beginner with steam.

Thanks Hopper, I’ll do that. I assume the lubricator then needs to go near the steam chest or does it not matter so much? I’m going to have a go at making both the lubricator and the steam valve rather than buy them.

Thanks for this Jason. Ive had a look but cant see it on their website. Can you tell me where I can find it?

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