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First Sterling Finally Running

Posted: Sun Oct 08, 2017 11:00 am
by mhafele
Runs good with propane torch. Any tips on running with less heat? Or how to get it to run longer without over heating?

Image

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Re: RE: First Sterling Finally Running

Posted: Sun Oct 08, 2017 11:20 am
by mhafele
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?

Image

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

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Re: First Sterling Finally Running

Posted: Sun Oct 08, 2017 10:21 pm
by thanh-cuibap
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...)
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https://www.youtube.com/watch?v=e850NKFEFW4

Re: First Sterling Finally Running

Posted: Mon Oct 09, 2017 4:22 am
by Ian S C
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

Re: First Sterling Finally Running

Posted: Mon Oct 09, 2017 5:53 am
by Administrator
That is a beauty! Absolutely.

Darryl

Re: First Sterling Finally Running

Posted: Mon Oct 09, 2017 7:22 pm
by Trevor
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

Re: First Sterling Finally Running

Posted: Tue Oct 10, 2017 3:52 am
by Ian S C
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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Re: First Sterling Finally Running

Posted: Wed Oct 18, 2017 10:32 pm
by cbstirling2
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?

Re: First Sterling Finally Running

Posted: Thu Oct 19, 2017 4:10 am
by Ian S C
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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Re: First Sterling Finally Running

Posted: Fri Oct 27, 2017 7:49 am
by cbstirling2
Have the model be vertical with hot side down. Less friction.

Re: First Sterling Finally Running

Posted: Sat Oct 28, 2017 5:45 am
by Ian S C
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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Re: First Sterling Finally Running

Posted: Sun Oct 29, 2017 1:26 am
by Trevor
By God! It's beautiful

Re: First Sterling Finally Running

Posted: Sun Oct 29, 2017 4:30 am
by Ian S C
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

Re: First Sterling Finally Running

Posted: Sun Nov 26, 2017 3:42 pm
by mhafele
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.Image

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Re: First Sterling Finally Running

Posted: Tue Nov 28, 2017 3:58 am
by Ian S C
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