Why is the blade tip speed a MAXIMUM 19,000fps? Is it some type of LAW? When was it established? What kind of testing was done and why this number? I appreciate and welcome opinions too but can someone show me HARD FACTS and literature to back it up? I guess I am not happy knowing that there is a standard without knowing the reason. So I know there are those engineering types and others who are interested and welcome the input. I would like to also know what a minimum blade tip speed would be and does horsepower enter the equation? I know that a 26hp motor can spin something very fast and that the speed is geared down by pullies. Would a faster spin give better results, why not 20,000 or 30,000? With the new materials and technology today, I would believe that anything is possible.