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Also, who got one on a spacecraft?? Stirling engines are usually quite weighty aren't they...?

"Can any of us claim to be able to produce an engine that will run every day for 25 years?" Not without maintenance / oil changes / replacing seals... I think if you were careful though you could get away with only basic maintenance once a year or so, and replacing parts every 10 years or ...

Hi, Commercially available PV cells (silicone based) are around 20% efficient at turning solar energy into electricity (although I think the maximum achieved is about 40-50% at the moment). Also they cost quite a lot. If you get it right then you can make a solar concentrator & stirling engine u...