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Single Acting One Cylinder

Building a working model of a steam engine out of Lego wasn't easy. I built my first engine when I was 15, (that's been quite a few years ago) and still learning this! Building a solid structure, keeping friction down, and keeping things balanced are important in the design. I found that the engine's rpm improves with a design that allows air to escape during the exhaust stroke.

Single acting one cylinder

Here's a shot of the air inlet. This inlet is configured so that the hole in the side of the cylinder lines up with it at just the right moments to provide the power stroke.	View from the air input side
Veiwing from the flywheel side of the engine. I didn't have the standard "+" shaped hub for the tire, so I improvised using a freewheeling hub and a 2x2 round from a space lego set which happened to have the "+" hole through the center.	Flywheel side view
Here are two side views. Notice how the base of the engine is rather massive. This accomplishes two purposes. It keeps the engine from tipping forward and also dampens vibrations for smoother running. (Believe me, it makes a difference.) Another thing to note is the position the crank wheel and cylinder are in. This is the starting position. A good hard blast of air into the inlet will set the engine in motion without having to spin the flywheel.	Another air input side view
Finally, top views. I don't know if these photos are enough to go by to build your own engine just like this, but it gives you a sure start.	Top view
	Front view