SERVICE MANUAL NUMBER 25
GENERAL INFORMATION
The bottom is referred to as having a “hook” if it is concave in the fore-and-aft direction. A
hook causes more lift on the bottom near the transom and forces the bow to drop. This
increases wetted surface and reduces boat speed. A hook, however, aids in planing and
reduces any porpoising (rhythmical bouncing) tendency. A slight hook is often built in by the
manufacturer. A hook also can be caused by incorrect trailering or storing the boat with
support directly under the transom.
72004
a
a - Hook
A “rocker” is the reverse of a hook. The bottom is convex or bulged in the fore-and-aft
direction. It can cause the boat to porpoise.
a
72005
a - Rocker
Any hook, rocker or surface roughness on the bottom, particularly in the all-important
center-aft portion will have a negative effect on speed, often several miles per hour on a fast
boat.
Marine Fouling
Fouling is an unwanted build-up (usually animal-vegetable-derived) occurring on the boat’s
bottom and drive unit. Fouling adds up to drag, which reduces boat performance. In fresh
water, fouling results from dirt, vegetable matter, algae or slime, chemicals, minerals and
other pollutants. In salt water, barnacles, moss and other marine growth often produce
dramatic build-up of material quickly. Therefore, it is important to keep the hull as clean as
possible in all water conditions to maximize boat performance.
Antifouling paint, if required, may be applied to boat hull observing the following precautions.
IMPORTANT: DO NOT paint anodes or MerCathode System reference electrode and
anode, as this will render them ineffective as galvanic corrosion inhibitors.
CAUTION
Avoid corrosion damage. Do not apply antifouling paint to Mercury MerCruiser
drive unit or transom assembly.
Index
90-861328--1
NOVEMBER 1999
Page 1A-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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