Activity & Learning Toys

Funwetrike Stirling Engine Model Kit, VE-01 Beam Vacuum Engine Model, External Combustion Engine Model, DIY Educational Tool for Teachers, Adults Popular Science: Vacuum engine is also known as “Flame Eater”, a simple but magical machine that demonstrates the conversion of heat into mechanical motion Adjustable Speed: The running speed of the engine is fully adjustable. It looks more elegant... Funwetrike Stirling Engine Model Kit, VE-01 Beam Vacuum Engine Model, External Combustion Engine Model, DIY Educational Tool for Teachers, Adults