TroyO wrote:Not completely useless.... Stirlings are used in submarines, apparently.
Another practical use of a Stirling engine is this, if you heat one side and cool the other they make motion, but if you spin the engine, one side gets hot, and the other side can get really cold like Liquid Nitrogen cold on a really efficient one, it is called a Stirling cooler. One problem with these coolers is that sometimes when you try to turn them off they can begin outputting motion until the hot and cold sides get closer in temperature.
Here is a real world example of a Stirling cooler in practice use, it costs about $12000, but you would probably be the only kid on the block that had one.
Now I wonder, of I hook the Stirling they are selling here to a motor can I use it to keep beer cold?