Speed-Controlled Single Cylinder Stirling Engine Model with Ball Bearing Flywheel - STEM Educational Toy

Adjustable Speed Stirling Engine Model Science Experiment Stem Toy with Ball Bearing Flywheel - Red Features: This Stirling engine model is novel and unique, with a sophisticated wooden base. The amount of air conduction can be adjusted with the top knob to control the speed of the Stirling engine, which is easy to observe.