Pro-Line Boats 21 DC, Owner'S Manual

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For most conditions the best all-round performance is obtained when the bow of the boat is slightly
out of the water, with all motors trimmed to the same degree.
General trim down (or "in") characteristics are:

Starting position for best acceleration to plane.

Lowers bow, providing better stability and ride in rough water.

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, porpoiseing 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).
Drive Trim