This is my first Ringbom engine. In a ringbom engine the displacer is driven by changing pressure instead of being mechanically moved by a connecting rod. The changes in pressure that drive the engine are caused by the piston going up and down. Because it runs without a conrod it will comfortably run clockwise or anti-clockwise. The purpose of the spring is to help neutralise the weight of the displacer.
Main dimensions:
Piston diameter: 9.5mm
Piston stroke: 7mm
Chamber height: 12.5mm
Chamber internal diameter: 74mm
Displacer height: 8mm
Flywheel diameter: 82mm
This engine operates on the heat from my hand, and will do anywhere from 40 to 100rpm, depending on the temperature differential. On a very low temperature difference the flywheel will not rotate a full 360º each cycle, but instead just bounces forward and backward over top-dead-centre. As the temperature difference increases, the bounces get bigger until it finally flips over bottom-dead-centre and carries on in the same direction.
front
rear
top
spring
piston & gland
