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Hi gang! a few of you have been asking about stirling engines so I thought I’d build a single cylinder Stirling engine and take you stepbystep through the construction. At the end I’ll show you some of the problems I ran into and how I solved them. To help you follow the construction, here’s a little bit about this single cylinder.

Design. it’s called a single cylinder design because there’s just one outer cylinder that contains the working fluid, which is air in this case. The air inside it gets heated down here. This other cylinder is a solid mass that moves up and down. When it moves down, it displaces the hot air at the bottom,.

Forcing it to move to the top. so this cylinder is called a displacer cylinder, or just a displacer. The displacer moves up and down under the driving force of this flywheel. As the flywheel turns it repeatedly lifts and lowers the displacer. In this case the connection between the flywheel and the displacer is this crankshaft and this thread. Since it is a thread, gravity does some of.

The lowering too. The other main part is this flexible diaphragm, which in some designs is a piston. In this case it’s just a balloon that’s connected to the crankshaft using these two connecting rods. It looks like the flywheel lifts up the diaphragm but it’s just the opposite. Hot air expands, and even though most of the hot air is at.

The bottom at this time, the overall volume occupied by the air is increasing. It’s that increasing volume of air that inflates the diaphragm and pushes up on the connecting rods. That turns the crankshaft and adds energy to the flywheel. That’s what keeps the flywheel turning and makes this whole thing work. When does the air cool down again? It cools down while it’s in the top part of.

The cylinder. when the displacer comes back up, it forces the cool air back to the bottom so that the whole cycle can repeat again. Now let’s go stepbystep through the construction. I’ll start with the single cylinder, which in this case is a can. The can is a tomato paste can and it is about 5 centimeters wide by 8 1/2 centimeters high.

Next is the wooden frame that holds it all together. And it works like this. The can goes in here, and then this piece of wood right here is a tight fit, wedged in there like that, and that holds the can in place. The only really important dimension here is the distance from the bottom of the can to this hole here. There’s one hole right there, drilled,.

And another one on the other side and they’re lined up. And that distance from the bottom of the can to that hole is 16 centimeters. The displacer cylinder needs to fit inside this can, but air needs to flow all around it. So the can is 5 centimeters in diameter. I’ll make the displacer cylinder 4.5 centimeters in diameter. The height should be about 6 centimeters. I have this piece of balsa wood here,.

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