Re: Need an explanation of rpm behavior
Another way to look at this is if all 14-inch diameter, 21P props from every manufacturer performed the same there would be only one manufacturer. Fact is, every prop manufacturer tweaks design characteristics to bias the performance toward speed, hole shot, or simply a compromise between the two. Remember, there will always be folks who want the absolute utmost performance (whatever that means to them) so they will spend a ton of money testing props to find what they want. Relating all of this to cars, putting a new set of tires on your passenger car can alter its fuel economy and hence it's performance (for better or worse). Props work the same way. When it comes to prop selection, you install a prop that puts the wide open throttle engine rpm at or very near the top of the engine manufacturers rpm band with what you consider an average load. Too much pitch lugs the engine and hurts performance. Too little pitch causes over reving but you may have terrific hole shot. Happiness is somewhere in between. Top end speed with be whatever that prop provides.
