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Manual Solar Tracker Dish with Stirling Engine uses a concave mirror to reflect sunlight onto the focal point of the Stirling engine. This action converts thermal energy into mechanical energy, causing the flywheel to rotate. This is a great tool to teach students about the process of converting solar (thermal) energy into energy that can power motors and other things that require energy and introducing them to a solar collector. Students can see that there are no gases caused by this method as opposed to burning fossil fuels to generate heat.