Nice crefts engine. I can use it with my generator when I am outdoor camping.
I find it to be entertaining first, unique in appearance, informative in design and operation. I showed it to a 4th grade science teacher and explained how she might use it to teach her students, an installer of security systems liked it so much he immediately bought one for his office desk, he also uses it to entertain.
Impressing Engine Model for my physical experiment. The sound is great and speed can be controlled. Awesome model for me. Recommend Stirlingkit!