Top-speed
Most people know this term without doubt. It is the maximum speed your boat will reach at full throttle. It is crucial piece of information to have when selecting a new propeller, especially if you do not know what size propeller you presently have. Many boaters dismiss top speed when selecting a prop because they never run their boats wide open at full throttle. A propeller’s suitability to a particular application must be assessed based on top speed and the rpm that is achieved at that speed. Other than your seat-of-the-pants preference, there is no other available information that can tell you whether your propeller size is correct, or more commonly, just how FAR off it is. Just as a doctor will evaluate your personal condition by running you on a treadmill (even if that’s not how you use your “equipment”), so too must a prop technician know how you boat is working when pushed to its limit.
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