The Dr Revered Stirling invented the Stirling Engine in 1880 in Stirling, Scotland. Over the next 100 years it found applications in space, medical, transport and burning methane from waste sites. Minor changes happened, but nothing new from a design prospective.

Then in the 1980s the microprocessor came on the market and added precise control to the Stirling Engine (i.e. 0.001 per degree steps). The Stirling Engine is a thermal engine and therefore about 80 to 90% efficient. Also the basic engine consists of 2 cylinders with a heat exchanger in the middle. So by heating one cylinder, the other one goes cold because of the heat exchanger in the middle. Kockums Marine AB, Malmo, Sweden launched a submarine in 1978 with 1000 hours on Stirling power in its first year.

This was a big step forward with multiple cylinders and other technology. This engine was then used in submarines throughout the Western World. Also during this time NASA used it for space experiments, since the engine is almost silent when running. At this time a US company was formed to build the US Stirling Engines, with the name Stirling Engine Inc and claimed intellectual property rights, when the copyright had expired in 1930. This is something that US organisations seem to do under the threat of legal action.

In July 1992 the magazine Electronics World + Wireless World had an article titled