Handling Adjustments - ProBoat PRB4075 Owner's Manual

Required Equipment and Accessories
Hex wrench: 3mm
Open-end wrench: 7mm
Changing the Center of Gravity
Moving the batteries to the front or back can
significantly affect the boat's performance. As
a starting point, the center of gravity of the
boat should be 30% (9-inches or 228mm)
from the rear of the boat.
A: Move the batteries toward the rear of the
boat to raise the front of the hull out of the
water for increased speed.
B: Move the batteries toward the front of
the boat for faster initial acceleration,
to eliminate oscillation or bouncing and
increase stability.
Drive Height
The center of the propeller shaft should be just
about to the bottom of the sponsons. Lowering
the drive will increase the propeller's ability
to bite at take off but excessive lowering can
cause the back of the boat to feel loose and
decrease top end stability.

Handling Adjustments

A
B
Raising the drive helps eliminate oscillation or
bouncing and assist with top end stability but
excessively raising the drive can reduce top
speeds and cause cavitation.
Use a 3mm hex wrench and 7mm open-end
wrench to loosen the bolt that attaches the
output to the bracket to adjust the height.
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