First Sterling Finally Running

Discussion on Stirling or "hot air" engines (all types)
mhafele
Posts: 2
Joined: Sun Oct 08, 2017 10:27 am

First Sterling Finally Running

Postby mhafele » Sun Oct 08, 2017 11:00 am

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
Posts: 2
Joined: Sun Oct 08, 2017 10:27 am

Re: RE: First Sterling Finally Running

Postby mhafele » Sun Oct 08, 2017 11:20 am

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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thanh-cuibap
Posts: 147
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: First Sterling Finally Running

Postby thanh-cuibap » Sun Oct 08, 2017 10:21 pm

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

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: First Sterling Finally Running

Postby Ian S C » Mon Oct 09, 2017 4:22 am

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

boydhouse
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Re: First Sterling Finally Running

Postby boydhouse » Mon Oct 09, 2017 5:53 am

That is a beauty! Absolutely.

Darryl

Trevor
Posts: 169
Joined: Sun Nov 06, 2016 4:07 am

Re: First Sterling Finally Running

Postby Trevor » Mon Oct 09, 2017 7:22 pm

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

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: First Sterling Finally Running

Postby Ian S C » Tue Oct 10, 2017 3:52 am

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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cbstirling2
Posts: 113
Joined: Sat Dec 17, 2016 9:35 pm

Re: First Sterling Finally Running

Postby cbstirling2 » Wed Oct 18, 2017 10:32 pm

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?
CBStirling2

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: First Sterling Finally Running

Postby Ian S C » Thu Oct 19, 2017 4:10 am

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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cbstirling2
Posts: 113
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Re: First Sterling Finally Running

Postby cbstirling2 » Fri Oct 27, 2017 7:49 am

Have the model be vertical with hot side down. Less friction.
CBStirling2

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: First Sterling Finally Running

Postby Ian S C » Sat Oct 28, 2017 5:45 am

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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Trevor
Posts: 169
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Re: First Sterling Finally Running

Postby Trevor » Sun Oct 29, 2017 1:26 am

By God! It's beautiful

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: First Sterling Finally Running

Postby Ian S C » Sun Oct 29, 2017 4:30 am

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


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