Gamma not working

Discussion on Stirling or "hot air" engines (all types)
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Image

new displacer
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Image

Image

making progress, I still have to fabricate new linkage, the new configuration should be air tight
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Image

Image

making progress, I still have to fabricate new linkage, the new configuration should be air tight
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

[youtube]https://youtu.be/be8xuXqwBaU[/youtube]

Still not working, I am making improvements, suggestions welcome.
Ian S C
Posts: 2218
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Gamma not working

Post by Ian S C »

Go back and read my entries of 2/3rd July please.
Ian S C
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Hi, thanks. I will start searching for more sizable materials. I have been trying to fabricate with off the self parts.
Ian S C
Posts: 2218
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Gamma not working

Post by Ian S C »

031+(640x480).jpg
031+(640x480).jpg (127.94 KiB) Viewed 7117 times
To a certain extent you can get by with bits off the self, and out of the scrap bin, but there comes a time when you actually have to make things, this can involve machining on a lathe, welding, brazing.
Ian S C
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Hi, nice work. Do you any engines that are larger? I need about 1/3 HP output.
Ian S C
Posts: 2218
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Gamma not working

Post by Ian S C »

That one has a bore of 3/8" and stroke of 1/2" for the power piston, power unmeasured. Built of bits found around the workshop. My largest engine could on a good day make about 10 Watts, it has a bore of 2 1/4", and a power stroke of 1 1/4". I don't have the equipment to build much bigger, or a fat enough wallet. Ian S C
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Hi, thanks for the info. Is that a 10 watt electrical load? Are you using a MPPT circuit? I look for ward toward your results on the new project. Thanks again.
Ian S C
Posts: 2218
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Gamma not working

Post by Ian S C »

The power was tested with a brake, and that's the mechanical power at the crankshaft, with a generator on that motor, on another day I got 8 Watt electrical
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

project update

[youtube]https://youtu.be/1iAG6NwaTXY[/youtube]
Ian S C
Posts: 2218
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Gamma not working

Post by Ian S C »

Had a look at your video(can't get it on my home computer), (1) I don't understand your hot cap and displacer set up, the displacer appears to be a large diameter, and fairly short. I could not see if the displacer cylinder is sealed. Why is there steel wool around the outside of the hot cap? The stroke of the displacer compared to the power piston seems excessive. The correct swept volume ratio between the two cylinders should be approximately 1.5 : 1. The displacer should be three times it's diameter long, this gives a reasonable distance between the hot and cold ends of the chamber.
Could you post a sketch of what you have built so I can see what you have.
Ian S C
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

Hi, thanks for the help and the info for optimal dimensions. I will post a drawing when I get it working. I did seal the the displacer. I am working on reducing the friction and I am just experimenting with what I have on hand at this time until I find better sized materials. Thanks again. I should be testing again in a few days.
burnit0017
Posts: 76
Joined: Sat Jun 26, 2010 9:54 am

Re: Gamma not working

Post by burnit0017 »

[youtube]https://youtu.be/MsGukccOABw[/youtube]

Results from last modifications. I am adding a water jacket, increasing the size of the displacer, and changing the power diaphragm. It still needs more suction and less friction.
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