Low Temperature Stirling Engine Classroom Teaching Stirling Engine Kit Steam Heat Educational Model Brass Aluminum Stirling Engine-HZZ92 Pro Black

Works better than expected. It is extremely well built and runs quietly. I have it sitting on the edge of a gas fireplace and when the fireplace is on I just give it a little turn and off she runs. Works great. Just remember that it is a low temperature Stirling engine so don't overheat it.

I have been wanting to order one of these for a very long time and finally pulled the trigger yesterday. I have it set up and running on my desk using a coffee cup warmer as a heat source. It has been running now for about 4 hours and is as intriguing as I hoped it would be. But not without a small problem in getting started. I am an engineer by trade and am fascinated by just about anything mechanical in nature and design. I unboxed the engine this morning and set it up and got it running but noted that it ran slower than expected and had a noticeable ticking noise and a roughness in the motion of the piston. I disassembled the piston and removed the glass tube/cylinder to find the o-ring that holds it in place had been damaged during the assembly process causing the cylinder to be misaligned. I removed the skived off piece, cleaned the cylinder and reassembled it taking extra care in aligning the cylinder. After replacing the engine on the hot plate and giving it a spin it worked like a champ and has been running continuously ever since. It speeds up and slows down as the hotplate cycles on and off so it is not just a monotonous noise but more like a background fluctuating rhythm. Even with this slight hiccup I am extremely happy with my purchase.UPDATE;This engine has been running on my desk for 8 hour a day since the day I got it without a single hiccup. I have gotten tons of comments and questions on it. I would highly recommend it if you are thinking about buying one. I am very very pleased.

Very well put together, solid feeling, and a lovely piece of engineering. And beautiful, too.I tried one of the cheaper ones which just felt flimsy and clunky compared to this.A pretty expensive toy, but what a satisfying toy it is. Recomended.

Nice toy and seems very durable. Works as described.

I had a little issue with the glass tube not being quite inline but now it goes great.