High-Speed And High-Performance Boat Operation; Conditions Affecting Operation; Bottom Of Boat - Mercury 350 Mag MPI Horizon Service Manual

CC828

High-Speed And High-Performance Boat Operation

If your boat is considered a high-speed or high-performance boat with which you are unfamiliar, we recommend
that you never operate it at its high speed capability without first requesting an initial orientation and
familiarization demonstration ride with your dealer or an operator experienced with your boat. For additional
information, obtain a copy of our Hi-Performance Boat Operation booklet (Part Number 90-849250--1) from your
dealer, distributor, or Mercury Marine.
CA958
Weight Distribution (Passengers And Gear) Inside The Boat
Shifting weight to rear (stern):
•
Generally increases speed and engine rpm.
•
At extremes, can cause boat to porpoise.
•
Causes bow to bounce in choppy water.
•
Increases danger of waves splashing into boat when coming off plane.
Shifting weight to front (bow):
•
Improves ease of planing.
•
Improves rough water ride.
•
At extremes, can cause boat to veer back and forth (bow steer).
CA959

Bottom Of Boat

To maintain maximum speed, the boat bottom should be:
•
Clean, free of barnacles and marine growth.
•
Free of distortion; nearly flat where it contacts the water.
•
Straight and smooth, fore and aft.
Marine vegetation may accumulate when boat is docked. This growth must be removed before operation; it may
clog water inlets and cause engine to overheat.
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Conditions Affecting Operation