Alan, a retired aeronautical engineer, doesn't seem to be retired at all. In his "spare time" he makes cool large scale models for exhibits, but the coolest thing is something that gets him (and you) tapping your toes...

To learn more about "Stirling Engines"http://en.wikipedia.org/wiki/Stirling_engine

For more on Alan: http://alansstreetorgan.weebly.com/index.html