Request Advice - Beam Walker Stirling

Discussion on Stirling or "hot air" engines (all types)
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Hawke
Posts: 92
Joined: Sun Jul 14, 2013 12:04 pm

Request Advice - Beam Walker Stirling

Post by Hawke » Tue Jul 16, 2013 5:19 pm

Image

Basic plan here showing some dimensions. Im curious about the ratio between the power piston(may end up being a diaphragm or actual piston) and the heat chamber holding the steel wool displacer. The flywheel will have to be moved in some it seems. Drawing is very close to scale with each component.
Im planning... (haha) to attach a pump mechanism shaft about 1/2 inch from the frame on the beam with a water reservoir below on the base or platform. Flow will be constant circulation maybe even thru a copper coil on its journey fed by gravity back to the reservoir.

Suggestions welcomed.
What we need is a More Heat or More cold, and Less Friction or Better Air Seals ...and an Aspirin!
Sripto Vu-Lighter Historian http://www.thehawkeco.com

Hawke
Posts: 92
Joined: Sun Jul 14, 2013 12:04 pm

Re: Request Advice - Beam Walker Stirling

Post by Hawke » Fri Jul 26, 2013 1:31 pm

A little progress report. A little different than the plan but what I have so far is pictured here. The homemade yoke will attach to the piston which is second attempt. First one made from epoxy putty was a little to tight to my liking. Current copper piston and cylinder may be to loose, LOL. I plan to attach the clear tube to the piston cylinder as arrow shows. Glue on items where not cured fully at time of picture today.

Image
What we need is a More Heat or More cold, and Less Friction or Better Air Seals ...and an Aspirin!
Sripto Vu-Lighter Historian http://www.thehawkeco.com

Hawke
Posts: 92
Joined: Sun Jul 14, 2013 12:04 pm

Re: Request Advice - Beam Walker Stirling

Post by Hawke » Fri Jul 26, 2013 3:54 pm

First test. No run.
The piston has too much friction and the connecting rod and yoke do not work fluently. The piston does pop out if connecting rod is removed and manually turn flywheel to raise the displacer. Displacer does move up and down nicely. Main issue seems to be the power piston, cylinder, and connecting mechanics.
What we need is a More Heat or More cold, and Less Friction or Better Air Seals ...and an Aspirin!
Sripto Vu-Lighter Historian http://www.thehawkeco.com

Ian S C
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Location: New Zealand

Re: Request Advice - Beam Walker Stirling

Post by Ian S C » Sat Jul 27, 2013 3:50 am

Unless you can make a low friction piston, a diaphragm might be the way to go. As far as a water pump goes, a diaphragm might be the way here too. Ian S C

Junkie
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Location: England
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Re: Request Advice - Beam Walker Stirling

Post by Junkie » Sat Jul 27, 2013 8:29 am

These engines require almost no friction to run. I have a few models that use a diaphragm to run.
There's printable templates for this one in the PDF section if you're interested :
http://www.scraptopower.co.uk/walking-b ... e-assembly
http://www.scraptopower.co.uk My web site, Stirling engines and AE stuff.

Hawke
Posts: 92
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Re: Request Advice - Beam Walker Stirling

Post by Hawke » Sun Jul 28, 2013 11:06 am

Thx for the input guys. Ive put this one on the shelf with the LTD I made. As I learn more I'll pick them back up. Working on this one I learned a way to make displacer out of steel wool and "a smooth nylon lift mechanism"(which I can apply to the LTD). I tried a diaphragm for the walking beam too but its not up to par for the walking beam.
Image

PS: Im doing the "fast-and-easy-engine" of yours now Junkie.
What we need is a More Heat or More cold, and Less Friction or Better Air Seals ...and an Aspirin!
Sripto Vu-Lighter Historian http://www.thehawkeco.com

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

Re: Request Advice - Beam Walker Stirling

Post by Ian S C » Mon Jul 29, 2013 3:59 am

Hawke, your diaphragm is not the right shape, get on the net and look at the tin can motors, if you trawl through this site you'll probably come up with a photo, or a web site. Ian S C

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