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

I think it is nothing short of incredible how well these little buggers operate!

The entire "J06" series of Stirling Cycle engines are of a similar size as the J06D that you are showing in this video, and I think some of them are even a bit smaller in overall size, though perhaps their displacer and power piston diameters or displacements are not.

They do list your J06D as "The World's Smallest Stirling Engine", but then later in the series they make the claim that the J06H is the "New World's Smallest Stirling Engine". I don't think it much matters, as the whole series of ten engines (A thru K skipping I) are of a size that staggers the imagination for micro-precision in tiny operating mechanisms. Their R06 Robinson is also of impressively small displacement, and the fact that with a little luck, most any of them could be picked up for the proverbial "Song" off of evilbay, just makes them all that much more amazing to my mind!

Again, the most amazing thing to me, is just how well they actually do perform, especially considering their diminutive size. Whether any of them truly are the "World's Smallest" I rather doubt, but they most certainly are mighty damn small to be running sooooooooo good and likely are the smallest that have been produced in numbers at this scale!!!