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JAJ 1054 ~ Hot Air Vertical Stirling Engine Engine is fired by denatured alcohol burner . Heat is applied to the end of the glass cylinder . The cylinder is air-tight. Therefore air in the cylinder is permanently sealed inside the engine. This fixed amount of the air is heated & cooled , causing it to expand & contract , this driving the piston. As the displacer moves up , the air in the cylinder moves down to the hot side , so the air pressure inside the cylinder increase , pushing up on the piston . As the displacer move down , the air in the cylinder moves up to the cool side , so the pressure inside the cylinder decrease, pulling down on the piston. Specification:- Weight : 400g Sizes : 70mm x 70mm x 200mm Material : Cylinder - glass Others - Aluminium 6061 (Video - https://www.youtube.com/watch?v=t3pmk7TVCac)