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Runs good with propane torch. Any tips on running with less heat? Or how to get it to run longer without over heating?



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mhafele wrote:Runs good with propane torch. Any tips on running with less heat? Or how to get it to run longer without over heating?



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Here is video link.
https://youtu.be/oOg6BuUzP78

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Hi mhafele !
1 / hot cap should be as thin as possible ( thickness of hot cap my stirling :about = 0.5 mm )
2 / between hot and cold zone should be insulation ( insulation :you can use teflon...) https://www.youtube.com/watch?v=e850NKFEFW4

You could try a spirit burner with a small wick.
It's difficult with this type of motor lay out, but a belt driven fan can work well.
Ian S C

That is a beauty! Absolutely.

Darryl

High mhafele
Damn nice engine you built - It appears you do have insulation between the hot and cold side of the engine.
I think that the cooling area (assuming it is aluminium) is a little small. With that much heat the cooling fins can't get rid of the heat. You could try using a small fan next to cooling side or make a water jacket instead of fins.
I do love the way you have made the engine with the generator - Well Done
Regards Trev

With a generator on the motor, it I possible to use a small electric fan from a computer, but these are generally 12V. one of my motors has one fitted to it's radiator.
Ian S C
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Of my Stirlings, the one that can run and run is an alpha in a V layout. This keeps the cold cold and the hot hot.

Gamma layout is a poor one. Alpha came later and let's face it. It is more advanced. Why monkey with poor designs?

So here is my ALPHA motor, similar power out put to the Beta above, but about twenty years newer. The steel cylinder head has been replaced with an aluminium one, and the water jackets are gone(they never were used, it would go all day without over heating), these are replaced with aluminium fins.
Ian S C
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Have the model be vertical with hot side down. Less friction.

With a ring burner with the motor vertical with the hot end up, the heat rises, easier to keep the cold end cool.
This is my free piston motor, it's a bit rough, it's been modified a number of times. Burner at the top.
Ian S C
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By God! It's beautiful

I wouldn't exactly say beautiful, it usually works, but not really fast enough, the maximum speed is about 1000 hz, and I would like 3000 hz, it does generate a little power, enough to run the radio, but the low frequency AC current takes a fair bit of smoothing to get a DC current without too much AC noise on the radio.
Ian S C

Did some tweaking and reached 6500 rpm. Until the hot cap blew off. Was held in with high temp lock tight but I was using propane torch. Guessing it got to hot.

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That's excellent speed, just needs a bit of engineering to redesign the hot end. If you haven't broken something, you are not really trying hard enough, the hot end probably needs to be brazed into the flange, what is the hot cap made of?
Ian S C