That's it in a nutshell. Determining reduction ratio, prop diameter, blade area, pitch and cup on the blade trailing edge is a critical science in getting the maximum performance out of a boat. On larger boats it is not unusual to try two or three sets of props before settling on the final ones.oldsparkey said:My guess that is the reason they make so many different props with all sorts of blade configurations and pitches (angles to the blades ) .
Actually you are wrong. Horsepower is exactly that - a true sense of power output.tx river rat said:...horsepower is not a true sense of the kind of power you can generate to do a job.