DjuiinoStar Hot Air Stirling Engine Assembly Kit: DIY Physics Science Kit for Big Kids & Teens, 30 Min Assembly Time

Thank you hope to provide less expensive V4 engines.

Easy assembly and worked first time. I did lubricate with powdered graphite. Really nice kit and the spare parts came in handy (retaining clips).

Cheap, fun, easy to assemble! Took me about 15 minutes. Quite noisy but impressively fast, made from inexpensive but sturdy metal. Tries to shake itself off the table, lol. Next project is to make a generator attachment to power something with it! Definitely happy with this purchase.

This kit was very rewarding to build. And super easy to follow the instructions, but as it says all over the product, you really need to know how it works to trouble shoot. Mine went together fine, runs great, but had a lot of issues keeping the flame on the bulb regardless of wick height, and the crank/conrods were a little crooked and wobbly. This caused the rods to rub the flywheel (super small tolerance difference nothing crazy) so I had to adjust the spacing, and ended up finding a little burr on the casting where the bearing inserts. The point of noting that, is an engine of any type is a precise machines device, and a beginner may not find little things that cause innefiencies. After a little bit of oil she runs silently, and almost starts on her own. Just a little nudge. Beofre I adjusted things she was noisy and needed a sharp spin to take off.

Assembled easily in the promised 30 minutes. Runs nicely on IPA for about 10 minutes per filling. Kit was missing the two 5x3mm set screws, but had extra 3x3mm ones that worked fine as replacements. Directions were clearly translated into English, but with the pictures provide sufficient information to complete the build without issues. As promised, several parts are quite small.