One of the best discussions I’ve heard about BitCoin:
Archive for April, 2014
Ralph Lemnah and I worked on some Gamma Stirling engines a while back. They would run on my wood stove, on a gas kitchen stove, or on an alcohol burner. We used a Coleman “globe” for the displacer chamber, so that one can watch the displacer motion. I used foam core for the propeller blades, making them much safer than engines with metal blades. This is what they looked like:
We also built a few Ringboms:
Tuning the Ringboms for performance required attention to the spring that keeps the displacer piston hanging in a neutral position.
We put all of the design information onto a CD, which is available at a nominal cost for people who wish to expand on our designs.
My interests turned to other things (3D printing) but Ralph has now come up with an Alpha Stirling that works quite well:
Features include adjustable displacer and piston throws and an optional gravity fed water cooling system for the cold end. Ralph hopes to display this at the Champlain Maker Fair in October of 2014