The Flame Eater is a hot air engine designed by Philip Duclos. There is a slide valve on the side of the cylinder which is driven by a cam on the flywheel. When the piston is at the top of it’s stroke inside the cylinder, the valve slides open. As the piston travels down in the cylinder it creates a vacuum which sucks in the alcohol burner flame placed just outside the port. As the piston approaches the bottom of it’s stroke the valve slides closed trapping the hot air inside the cylinder. Because of the cooling fins on the cylinder, the air inside the cylinder cools which creates a vacuum. This sucks the piston back to the top of the cylinder. The engine is capable of around 2000 RPM and can produce a small amount of power. Power is limited by the atmospheric pressure acting on the area of the piston and the length of the stroke. The engines were produced full size in various configurations to provide motive power in factories.