Here is a cool race car that is powered by nothing but air. The Air-Power Turbo Racer uses a pump to compress air into the tank to power the toy. Its engine takes the pressurized air from the tank to push the piston forward and release air into the cylinder which pushes the piston down and rotates the rear axle. This race car can travel at speeds up to 9mph.
More gadgets like this: here
Air-Power Turbo Racer
This may be a fun toy for kids over 8 but also can be used to teach physics. You can use this to explain how classic piston engines work. It has as total piece count of 91. The above video shows it in action.
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