Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Very nice engine Bob, thanks for sharing !

We´re a few in here who have one (or more) of these as well.

As far as i recall, Daniel "Stoker" even made a relatively detailed comparison thread years ago, comparing the original "Sun Motor" (twin flywheel/open crankcase) version from the Phoenix era, and the current "Sun Runner" (single flywheel/closed crankcase) from PM Research N.Y.

As Jan has recalled, I do have a small fleet of these solar powered Stirlings in a couple of different iterations, and did do some comparative testing on them some years ago. I also made the "Promise" that I would continue the testing to investigate a few other parameters and try a couple of other experiments, which I have as yet not done. Perhaps I will get back to this interesting project some one of these days?!?!

Meanwhile, here is a link from the original thread still to be found on our old and beloved UM&OSF Forum and see what was and yet could be.

https://www.tapatalk.com/groups/modelsteam/heliocentric-experiments-t80613.html

Thanks for reminding me of this Jan!