Activity & Learning Toys

Joytopiaminds Stirling Engine Model Kits, Working Tractor Shape Air-Cooled Stirling Engine for Physical Science Experiment Display 【Real Working Tractor Mechanics】Features authentic tractor design with functional micro Stirling engine - closed cylinder uses thermal expansion/compression cycles to drive motion. Perfectly demonstrates energy conversion principles in action... Joytopiaminds Stirling Engine Model Kits, Working Tractor Shape Air-Cooled Stirling Engine for Physical Science Experiment Display