Inertial construction toys
prices on 13 models
Inertial
— designers with engines operating on the inertial principle. The operation of such an engine is based on the fact that it stores mechanical energy and then transfers it to the wheels. In fact, this usually looks like this: the model standing on the floor (or other surface) must be pulled back by spinning the wheels and compressing the spring inside, and then released — and the car will travel some distance.