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.

My 10 year old grandson assembled this with me helping interpret the instructions. Worked right off the bat. I like the attention to detail and how the kit came with extras of the tiny easy to lose pieces. A couple of things that maybe are in the instructions but I had to learn the hard way. Don't grease the hot side moving connecting rod or the cold side piston. I think they have to leak air for the engine to work. It was easy to clean up and get it working after I stupidly greased. The kit comes with a short length of clear tubing. This lets one cut new retaining bushings as needed. The ones on the hot side connecting rod seem to melt off eventually. I would buy this again.