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<t>Has anyone here ever seen an alpha ringbom engine before? Ever since<br/> reading about the design in Senft's book, I've been looking for one on<br/> the internet but never seen it. <br/> <br/> I'm in the middle of trying to build one but have run into some snags<br/> (lack of available time most...

<t>Has anyone here ever seen an alpha ringbom engine before? Ever since<br/> reading about the design in Senft's book, I've been looking for one on<br/> the internet but never seen it. <br/> <br/> I'm in the middle of trying to build one but have run into some snags<br/> (lack of available time most...

<t>I know cast iron and, I can't remember what the metal is, I thought it was brass or bronze, can run dry in the cylinders without the need for lubrication. You could put a sleeve of brass into the bore and then use a cast iron piston on the cold side, I'm not so sure it would work on the hot side,...

This is pretty dang small too....

http://www.youtube.com/watch?v=dICFVknQ7_Q

I thought this was so neat.

<t>I constantly see so many engines with graphite pistons and pyrex<br/> cylinders, but I don't know how people machine out the pyrex. I know<br/> just using regular tooling doesn't work. Can anyone help me out on this?<br/> <br/> I was reading Jim Senft's book "Ringbom Stirling Engines" again and I...

Graphite is of course the best answer for something that doesn't need lubrication, but and aluminum piston riding in a brass, bronze or steel cylinder works well also.

<t>Well, if you are making a small model engine, and you don't have a lathe, using JB weld to make a piston in a brass cylinder works quite nicely. Read my other post in the Educational engines forum. Are you making an LTD engine or one that runs hotter? Because for LTD's, styrofoam works great for ...

Thanks Rick, I appreciate your input. And just for clarification I meant I read somewhere about a particular pressurized engine that would only run for about 15 minutes.

<r>I'm not sure if this is a scam or not, but if it is true, what an <br/> opportunity!!!! It looks like the Quiet Revolution Motor Company is <br/> selling their prototype engine on ebay..here's the link<br/> <URL url="http://cgi.ebay.com/ws/eBayISAPI.dll">http://cgi.ebay.com/ws/eBayISAPI.dll</URL>...

<r>In response to the previous post of "How Small an Engine?" I just<br/> thought I would share this link.<br/> <br/> I imagine if you speak German, it would be better, but if you don't<br/> (and I do not...sadly) you'll still get enjoyment out of this.<br/> <br/> <URL url="http://www.youtube.com/wa...