Stirlingengineforum.com

Very simple engine to build. No machine tools needed. He also hooks it up to flywheel for rotary motion. Runs in hertz not rpm. Uses rubber bellows. Greet for linear generator for electrical production. It can be silent by lowering displacer.
http://youtu.be/rxnpptFMT68

I don't think its a stirling engine. Its called a free piston mason engine. Quite a lot different from stirlings original engine. It does use the stirling cycle. Its not a steam engine if it doesn't use water, but its could still uses a the rankine cycle ,with some other working liquid. I don't know were you draw the line on these things.

It's a free piston Stirling Engine OK, very cleverly made. Don't know how long diaphrams would last in hours run, a motor built by me would need to have a few hundred hours, but that one is good. Ian S C

Ian SC, your right the bellows is definitely a week spot. In this age of new of new exotic plastics Iam hoping to find an accordion bellows used industrially that can take the ware and heat. If anyone has an idea let me know what its used for or where to get it. Iam sure it wont be cheap but us nonmachinest would have to make that sacrifice.

Here's a video of his latest engine in which he uses a bellows power piston design. When you see it running at the end of the video (after he changed the design a bit), its power seems super impressive.

[youtube]http://www.youtube.com/watch?v=ZbYihmZnN9A[/youtube]

He claims in a video comment somewhere that all parts were available from a dollar shop. Hopefully he does another video showing us the the 'blood and guts' of his machine and an indication of the components used.

another vid of this engine http://www.youtube.com/watch?v=gbGO9ucrcZo

That thing is a beast. He needs to support it better. It just looks like that design is more powerful than a standard beta or gamma. Iam thinking of using that design and replacing the the bellows with a pneumatic drill motor. Its self timing which would eliminate any connection rods. The drill motor would turn the linear movement into rotary. The drill motor turns 1800 rpm at 90psi. Pneumatic tools are high torque. It looks like Blades free piston engines would also be high torque.

You can only get out what you put in, minus an allowance for friction etc, Blades engine has very little friction, yes it need stabilizing, but I think he would develop it a bit more. Ian S C