Heinrici type stirling

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madjackghengis:
Hi Dean, that is one of the most interesting arrangements for a Stirling engine I've seen, and you're doing a great job on it, nice detail work and nice finish to the machined parts. Looking forward to seeing it together, first of all, and then the run video. That tandem piston setup is almost like a "Ringbom" Stirling, it looks like, using the same cylinder for both displacer and power piston. Great work :ddb: :nrocks: mad jack

Dean W:
Hi Jack, and thanks for the kind remarks!
The setup is kind of like a Ringbom, I guess, except on this one, the con rods for the displacer can and the power piston run concentric in the bore, and they both have their own rod throws, one connected to the crank, and one to another crank that runs off of the linkage off one end of a flywheel. They run out of phase so the piston and displacer don't meet in the middle, one going up, the other going down.
It's an interesting mess. ;)
Appreciate your comments!

Dean

madjackghengis:
Hi Dean, I've been studying Stirlings for some years now, for modeling purposes as well as the possibility of building one of useful size and power, but this is the first time I've seen this particular arrangement of the linkage, and you're right, it only resembles a Ringbom, it is an entirely different beast, and I really look forward to seeing it spinning under its own power. Bernd said the linkage ought to look very interesting while its running, and I would have to second that. It is the most interesting arrangement I've seen recent enough to remember, and I may very well try to duplicate your work and build one on that design myself, when I get done with the radial, the steam engine I started a couple years ago and didn't finish, it's just a matter of figuring out where it fits in the list of "to be done" projects which grows at about the same rate as my stack of books to read. I'm thinking you might try going into overtime so you can get this done twice as fast, and we can see it spinning twice as soon, you do some very nice work, and its a truly unique build, inspiring. :jaw: :nrocks: mad jack

Dean W:

Hello fellows;

A few more pics. Making a bit of progress.

After I know the pieces all fit well, they get stacked on the mill table, and bored for the arc that will show
in the bottom of the firebox/base.

One of the pieces gets a slot milled so the burner can slid in.

I twisted some single strand tie wire into a tight two strand braid, and wired up the four sides. The braided wire
will stay put much better than a single strand of regular tie wire. Flux, and four little bits of 56% silver brazing
wire, and heat it!

The sides are 1/8" CRS, and it took a while to get it up to heat. I used two Bernzomatic type plumbers torches.
They are just the regular kind that take 1lb disposable cylinders. I put MAPP gas in one of them to get a little
extra heat. Isn't that just like an ol' rod burner.. More rod! More heat! (More money!) ; )

Then did the same for the bottom corners. The sides between the top and bottom corners will just get filled with
regular 96/4 solder.

Then onto the mill to take a skim off the top so the engine base piece will sit nice and flat.

I put on the top the same way, with hard silver wire. After this was done, all the edges got the regular
solder, and everything was filed nice and flat.

The flywheels I got from PMR are nice, but not large nor heavy enough. So, turned up a couple of steel
rims from a piece of DOM, then skimmed the flywheel centers to fit the rims.

Another assembly shot. Still half a dozen pieces to make, but it's getting there!

Thanks for looking,

Dean

sbwhart:
Great work I like how you fabricated the tower.

Stew

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