Stirlingengineforum.com

why do most model stirling engines have displacer piston (gamma type) instead of hot piston and cold piston (alpha type)?

That, wouldn't work... it would chanche the composition of the material and it even might not harden at all. You can add some grease to do mold to make it easier to unmold though...

Cheers!

Check here:
http://www.stirlingengine.co.uk/productskta18.html

Anyone know how this works, and how to build one? Their explanation sounds cheesy...

here's another one of these stirlings: http://www.geocities.com/mgmlab04/