Prop - Pro-Line Boats BAY Series Owner's Manual

* Reduces boat speed and economy due to increased drag of hull and drive.
* More spray over bow.
General trim up (or "out") characteristics are:
* Raises the bow of the boat in the water, resulting in less hull in the water.
* Greater speed and economy for a given throttle setting.
* Greater maneuverability (provided prop does not ventilate during the
maneuver)
* In excess, the reduced stability can lead to bouncing, porpoising and
propeller ventilation.
In addition to providing ideal boat performance, the power trim enables the motor or
drive unit to be raised (tilted up) for trailering, beaching, and launching.
The electric motor that drives the hydraulic pump is protected by an internal thermal
circuit breaker that interrupts the power when overheated. Avoid continued pressure on
the switch after the unit has reached the limits of travel (you can hear the difference in
sound as the pump strains against the increased load).

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.
Fig 8 Drive Trim