The axial flow single stage pump is one of the parts that slow down the performance even of the most powerful watercrafts. Recently we were informed by a certain team that carried out some tests and found out that only the 30% of the actual horsepower is translated in to useful thrust. It is obvious that a big portion of power gets lost on the way If some one could manufacture a pump with a twin-blade configuration rotating on opposite direction each one of them then the performance would have increased very much. Some people out there are working on it however it is not a cheap project.
