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Hi All, I've been working on a stirling helicopter. There are a few examples of these on YouTube and I'm working from the same set of plans. It's still a work in progress but I've been documenting the entire build with a series of videos. Here is a link to the YouTube Playlist...

This Stirling Engine uses neodymium magnets in the displacer and slide piston to control the return stroke of the displacer. A third magnet above the displacer balances the forces to minimize friction in the glass cylinder. All pistons are made of graphite. The main cylinder is a Pyrex test...