Propeller blades are used instead of flywheels, which is more novelty. full of mechanical and technological metal knowledge. High quality: the machine is mainly made of zinc alloy material, the surface is electroplated and the surface is rich in metal lustre, the machine runs smoothly and reliably, and the double combination of texture and beauty. Operating principle: the Stirling motor emits its performance through a cycle of cooling, compression, heat absorption and expansion of the air in the cylinder. Meaning and Value: You can practice your hands-on skills, expand your knowledge of physics, and increase your interest in learning.