A variation on my 90mm temperature engine, built using common parts. This engine is designed to run on sunlight, with the top plate collecting the heat from the sun and all the fittings being connected to the underside of the bottom chamber plate.
Main dimensions:
Piston diameter: 9.5mm
Piston stroke: 7mm
Chamber height: 16mm
Chamber internal diameter: 74mm
Displacer height: 8mm
Flywheel diameter: 82mm
It will run between 80-200rpm, the warmer the sunshine the faster it goes. One big benefit of this configuration is the the cool plate (the underneath plate) is raised up off any potentially warm surface (hot patio, hot table etc.) which helps maintain the temperature differential. It also allows air to circulate freely against the plate which aids in cooling.
front
rear
top
rear-below
hub
crank
underneath
