Adjustable Speed Stirling Engine Model Hot Air External Combustion Engine Model with Vertical

Feature: 1. Adjustable Speed: When the engine is running normally, the speed of the engine can be adjusted by turning the knob on the top of the engine. 2. Quality Material: Engine model is made of glass, aluminum alloy, solid wood materials and fine craftsmanship to avoid rust and prolong the service life. 3. Easy to Operate: Install the two knobs, add two thirds of 95percent fuel (not included) to the fuel lamp, ignite it, heat it for 30 seconds, then turn the flywheel, and the engine can run. 4. Wide Range of Applications: Used in children"s science projects, physics, mechanical learning, classroom teaching props. Birthday gifts for friends, family, parents, children, etc. 5. Heat Engine: Cyclically compress and expand air or other gas (working fluid) to operate at different temperature levels, thereby converting heat energy into mechanical work. Specification: Item Type: Engine Model Color: As Pictures Shown Weight: Approx.455g/16.0oz Material: Glass + Aluminum Alloy + Solid Wood Size: Approx. 10x10x10cm/3.9x3.9x3.9in (after Assembly) Scope of Application: Used for Children"s Science Projects, Physics, Mechanical Learning, Classroom Demonstrations, Etc.. Package List: 1 x Engine Model1 x Fuel Lamp with Lid Wick2 x Accessories Note: 1. Suitable for children over 14 years old.2. Please kindly note that you will receive several of spare parts, you need to assemble by yourself.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.