2-cylinder Gamma - project

Discussion on Stirling or "hot air" engines (all types)
Ian S C
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Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: 2-cylinder Gamma - project

Post by Ian S C » Sat Apr 19, 2014 1:52 am

I find something similar with my motors in the cold weather, the ones that run on LPG I put down to the reduced gas out put in the cold weather. Some times the gas cylinder is so cold that there is not enough pressure to get a flame. Ian S C

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Mon Apr 21, 2014 12:13 pm

hi,

about LPG, i can understand that, but my burners burn a butane/propane mix, and last winter it wasn't what you would call very cold, most times it was about 5 degrees C.

I think heat escaping to the surrounding area is the biggest problem.

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

Re: 2-cylinder Gamma - project

Post by Ian S C » Wed Apr 23, 2014 1:34 am

At one time the retailer sold a different mix in winter time, but I don't think they do now here. And the Meths we get doesn't seem as hot as it was. Ian S C

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Sat Aug 09, 2014 1:30 pm

Hi there!

An update from about this engine!

I Disassembled the engine, and i'm now completely rebuilding it. There are quite a few parts that will be remade, beginning with the crankshaft en top-plate.
The new parts will be amazing, I got acces to a fully equipped metal workshop, and got some help for the machines.
So now i can use a lathe and a computer controlled mill!
For my new crankshaft, this is ideal. I can drill the holes with te mill, much more precise than it is now.

I hope to post a few updates soon, it's my vacation now, so i hope to start working on the crankshaft very soon.

Regards,

Krijn, from the Netherlands

Oh, and check out my video about disassembling the engine!
[youtube][/youtube]

ilovesteel99
Posts: 4
Joined: Fri Sep 12, 2014 1:24 pm

Re: 2-cylinder Gamma - project

Post by ilovesteel99 » Sat Dec 06, 2014 7:11 am

how do you work out the displacement? thanks and also is your cylinder 3 times longer than the width? (216mm)

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Mon Dec 08, 2014 6:26 am

For the displacement i just tested how big a displacement i could make with the diaphragm.
The displacement of the displacer must be around 1.5 times as big. So i multiplied the displacement of the diaphragm with 1.5 and that's the displacement of the displacer cylinder.
With that information i could work out the stroke. I think I kept the ratio around 1.9 otherwise the stroke would be really short.

My cylinders aren't 3 times as long as the width. The width is 73 mm on the outside, the length is about 180 mm.
I couldn't make them 3 times as long, because my bottle isn't long enough.

I ran the engine with only a weth cloth as cooling, and when the bottom was red hot, i could run it for about 15 minutes, before the top of the cylinder exceeded 100 degrees Celsius.
So the shorter cylinder isn't really a problem i think, heat transfer is minimal.

Regards,

Krijn

P.S. Currently re-designing the whole engine, starting a video series about it soon, so stay tuned if you are interested !

Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: 2-cylinder Gamma - project

Post by Ian S C » Tue Dec 09, 2014 2:33 am

Krijn, good on you getting it going. Got a friend who used a pair of his wife's knickers, just kept them soaked in water, worked well(don't know what his wife thought, but she did leave him some time later).
It will be good to see how you go with the new motor.
Ian S C

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Tue Dec 16, 2014 9:18 am

Here is the first video, just an introduction to the rebuild, and hoping that people get interested and follow the rest of the video's.
Enjoy!

Video!

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Mon Feb 02, 2015 3:21 pm

Second part! : Part 2

Just a quick insight into a few changes I made.
It are all little changes, but I want this engine to be a lot better than the previous.
Next part will show the start of the Solidworks drawing!

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: 2-cylinder Gamma - project

Post by Triangle.Stirling » Fri Mar 27, 2015 4:46 pm

And there it is, the start of the Solidworks drawing from wich the engine is going to be built.

Want to finish the rest of the drawing and start building, but school is busy. Hope to finish it sometime soon. Enjoy!


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