Description: - engines are unique engines because of their theoretical efficiency is almost the theoretical maximum efficiency,Called the efficiency. - This is an external combustion engine in which the fuel is burned continuously,and the piston is moved by the expansion of air (or helium or ) as a medium,and the expansion gas is cooled in the cold chamber,and the is repeated.Only a small lamp,you can make it and strong power. - As the external combustion engine to avoid the traditional internal combustion engine of the explosion to do work,in order to achieve a high efficiency,low noise,low pollution and low operating costs. - Aerodynamics are knowledge of physics,single cylinder combustion engine.Engine principle is intuitive,educational toys,teaching experimental equipment can effectively cultivate children's interest can also be used for classroom teaching,more intuitive and easy to understand. - The engine model on the horizontal position by hand toggle the flywheel to see if smooth,if there is a strong sense of astringent,check the connection rod is normal,whether the cylinder oil and dust,and ,please use toilet paper to erase Not smooth.Toggle the flywheel feel pressure within the cylinder body is a normal phenomenon,the cylinder is sealed.Specification: - Assembled size: 16x8x9cm / 6.29x3.14x3.54inch - Material: MetalPackage Includes:1 Set Hot Air Model KitNote: