• ✅1/12 scale Hot air pumping engine is a closed-cycle external combustion engine model
• ✅It uses butane gas as fuel and has a water-cooled circulation system for reliable operation
• ✅The engine has fewer moving parts, requires minimal maintenance, and has a longer service life
• ✅To start the engine, fill the gas tank, ignite the boiler, add water, and hand-crank the flywheel
• ✅It makes for an excellent desktop decoration, collection craft, and high-end holiday gift for mechanical enthusiasts