Archive for April, 2014

BitCoin

April 1, 2014

One of the best discussions I’ve heard about BitCoin:

http://surprisinglyfree.com/2014/03/25/garzik/

Ralph Lemnah’s Alpha Stirling

April 1, 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:

Gamma One From Angle

Gamma One From Left

We also built a few Ringboms:

Coleman One From Back

Coleman Two From Angle

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:

20140315_111827a

20140315_111832a

20140315_111843a

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