if it was guaranteed (the perfect world) that your prop was spinning 30,000 rpm, one guy would be faster then the other (also assuming slippage was the same) by what is referred to as pitch.<div>
</div><div>Pitch is the distance (horizontally) a prop will move through the water in 1 rotation. This is determined by the angle, shape, and size of the blades.</div><div>
</div><div>The motor has to have enough power (watts/HP) to turn the prop.  The bigger the prop, the farther you try to push the boat each rotation, the more power you need.  approximately 30,000 rpm is chosen for a large number of reasons. Balance, friction, motor efficiency. . . </div>