Heinrici type stirling

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sbwhart:
What a great bit of work never seen a Stirling go so quick, interesting to see what it does with a spirit burner just to see where it gets the humph from:- Design or Burner ?.

:clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap:

Fantastic

Stew

madjackghengis:
Hi Dean, regards for the suggestions on the flywheels and mounting, now, having heard your engine run I think I've seen the stirling engine I want to build once I'm done with the radial engine. That is one impressive monster, and it sounds like a real powerhouse. I think the efficiency of having the displacer and power piston in the same cylinder, and moving on the same axis is a major component of the power of that engine. I've never seen a stirling that would not quit when one grabbed the end of the shaft, not a model anyway. Congratulations, that is a great build, I've watched it about three times already and will again, tonight when I get back from work. Did you work off plans, or just off knowledge of the design and making parts that fit? If you've got plans to share, I'd sure like to see them. :jaw: :jaw: :jaw: :thumbup: :nrocks: :ddb: mad jack

John Hill:
Congratulations on a beautifully made powerful runner! :thumbup: :thumbup: :thumbup:

Dean W:

David, Rob, Stew, Jack, John, thanks very much for the comments. It ain't done yet!

Stew and Jack, the prints say to use this burner, or a lamp. I'll make a lamp for it eventually and show how it runs
on that another time.

Jack, the prints are from Jerry Howell. I have a couple different sets from him. He does nice, clear, accurate drawings.
They are under copyright, so can't be put up here, but you can get them for just $18 from his web site:
http://www.model-engine-plans.com/engineplans/stirling/duplex.htm
He died a while back, but his family continues to run the business. He has a lot of neat projects there.
BTW, he mentions that this type of stirling, with the power piston and displacer in the same bore, would
be expected to be more powerful than engines with separate cylinders because the compression ratio will
be higher. It does have a pretty good amount of compression for the type. You can definitely feel it
when you crank it over.

Thanks again, fellows.

Dean

Dean W:
Hello all;

Got a few more things done for this in the past few days.

It needs four feet to hold the firebox to a mounting base. After figuring out where the first arc goes I took
a bunch of cuts using the boring head for the first one. This is the only one I laid out. All the other cuts
were done by returning to my zero point on the dials, flipping the piece, and cutting again. Then swap
ends on the flat stock and do it again.

When the two ends were done like this on the flat stock, they were cut off, and the two ends were done
again.

Ended up with these things.

Then they were all clamped together, the top skimmed, a slot milled down the center, and using a
countersink, cut the start of a large 'V' shape that will go on the corners of the firebox.

Once I had a reference for the sides of the 'V', the pieces were turned on side and a pin in the spindle
used to get one of the flats square with the mill head.

Got rid of all the waste.

Since the firebox sides are angled toward the top, the 'V' cut on the feet can't fit up tight against it.
See the large gap on top?

To make them fit, the edges are beveled right up into the corners using a file.

To round off the ends around the mounting holes I made up a couple of filing buttons and had at it.

I got the inner parts of the flywheels painted, and found a suitable board to mount the engine.
Time for a trial fit-up.

Everything's just sitting there for the moment. Not really bolted down.

(The base and flywheels are from the same can of paint. Some lighting trick makes
them look different. They really are the same!)

Still some hours of work to go. Firebox door, mount for the burner, fan.
Hope to get some more done in a few days!

Thanks for checking it out!

Dean

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