Pro-Line Boats Pro Line 19 Sport Owner's Manual page 18

Prop
If your Pro Line was ordered with a factory installed engine it will have a propeller that
has been performance tested to provide the best all-round performance for your engine
/hull combination at sea level.
In some situations, it may be desirable to re- prop your Pro Line to enhance desired
performance needs. For instance:
* Decreasing pitch will enhance acceleration and power at high loads.
* Increasing pitch will increase speed at light loads.
* Decreasing diameter will compensate for loss of power at high altitudes.
* Increasing diameter results in higher efficiency at low speeds at the
expense of top speed and acceleration.
When re- propping to a lower pitch or smaller diameter be sure not to over rev the engine
at top speed, engine damage could result.
Operating your engine with a damaged prop will decrease top speed, increase fuel
consumption and may introduce undesirable handling characteristics. The vibration
caused by running a damaged prop could cause costly damage to your lower drive unit.