very fast shipping very good seller
A beautifully crafted machine, my only disappointment was there were no spares in the tubes? Or odd screws that are likely to come lose. But this is a minor detail as there are replacement tubes available. It has a distinctive sound and motion, being one of few “ free piston “ designs built for displaying the awesome way Stirling engines work. They’re under appreciated and often ignored but have so many uses! From models to Submarines! Even in Space travel!