A balloon rocket is a balloon filled with air (or also another gas). If necessary still something water can be given to the balloon also before inflating. It is started, in which one releases the opening of the balloon. It is advanced by the recoil of the leaking out gas. The flight altitude amounts to some meters. The balloon rocket does not possess a technical meaning. It is used gladly as cheap and harmless equipment for the demonstration of the recoil drive.