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Monotube Boiler
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vtsteam:
Tony to respond to your other questions, I guess virbrating the tubes could help detach small bubbles if they are truly what is happening. But it sounds like you want to move in the direction of simplicity and low weight. The more electronic gear you use and the greater the system complexity, cost, and failure modes.

Why not try to locate your bubble formation problem area in the monotube and increase pressure there by constriction, rather than having a uniform diameter tube? Then reduce pressure to your engine's tolerance level by increasing tube diameter when you approach the inlet?
vtsteam:
I'm finally getting back to this project -- 18 months later and I have my 3/16" stainless tube to make a monotube. But I wanted to read up on a couple more things before bending it. I don't think stainless will take a lot of re-bending, so I want to pick the right shape first. I'm still up in the air about coils vs figure 8  in a horizontal monotube, or just random bending.

I found a really interesting article in issue # 3355 of Model Engineer, mentioning a successful monotube at the very end, with a photo, but I don't have the follow-up issue #3356 -- my stack jumps to 3357!  I must have lost it :doh:

Can anybody send me or link to a pdf (or just page photos) of  the continuation article "Model HUNT Class Destroyer" by T.B. Rose  in Vol 134, Number 3356  (Nov. 1968) ?

Or I'd be happy to buy the issue if someone has it, and no longer needs it.

Thanks!
tom osselton:
You will probably find this interesting it's one of Jay Leno's  steam cars telling a fair bit about the steam generator.

vtsteam:
Hi Tom, I'll check that out tonight.

I got tired of waiting to do something on this today and just dug in. I wound a plain coil of the stainless tube on 3" dia. form. I was a little worried about kinking, but it bent fine.

tom osselton:
Look good
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