N00b and a Walking Beam

[Bidwell]

I just built my first Stirling engine after discovering their simplicity. I chose the walking beam because it looked easier. Being a plumber for over 40 years, I've accumulated more than enough to material. I used Bondo (cheap) for the piston and ¾" copper pipe for the cyl. Pressure chamber is made from a spray can, sealed with JB Weld. Plastic chain and lav pop-up linkage are used for the beam. Small ball bearings used throughout.

It didn't work at first but with a little tweaking it started. I found by leaving my "mounts" a little loose, I was able to move things slightly and decrease drag and improve the speed. A drop of WD-40 really helped. What a thrill to see it actually move!

Question: Is there a reason not to have the passage from the drive cyl to the pressure chamber full size? I would think a small ¼" hole would restrict air movement.

http://www.youtube.com/watch?v=QJcDtlXe20Q

[Bidwell]

These things are addicting.
http://www.youtube.com/watch?v=oE7JTUFYAwI

[Ian S C]

Bidwell, just watch the WD40, it may cause you a little bit of difficulty after a while, it tends to build up a layer, and might cause things to sieze up, so you have to clean it off every now and then. Ian S C