Engine Compartment Ventilation System; Trim Tab/Stinger Wake Plate (Optional) - Centurion Ri257 Owner's Manual

Controls, Features and Options
ENGINE COMPARTMENT
VENTILATION SYSTEM
Ventilation or blower systems are designed to remove explosive vapors that
accumulate in the bilge area and engine compartment. Proper ventilation is
extremely important to personal safety while boating.
Powered ventilation systems consist of one or more sealed fans that replace
vapors with fresh air through intake and exhaust vents. Always operate the blower
for at least four minutes before you start the engine. You should also operate the
blower continuously when at idle and during slow-speed operation.
Natural ventilation systems also have intake and exhaust vents; as the boat
moves, air is forced into the intake vent and escapes through the exhaust vents.
The engine compartment cover is a structural part of the boat and acts as a
machinery guard. The engine cover must be in place and closed whenever the
engine is running. DO NOT operate your boat with the cover open or with the
engine exposed. WARNING! Contact with moving parts can entangle, cut and
can cause death or serious injury. Never make contact with any running
machinery moving parts, such as the engine or propeller.
TRIM TAB/STINGER WAKE PLATE
(OPTIONAL)
Trim tabs are either power or manually controlled. (Equipment will vary by model
and options.) A powered trim tab is controlled from the helm by a switch and use
of a position indicator. A cavitation plate is controlled by manually adjusting the
plate adjustment rods to a predetermined position.
A trim tab enhances the planing ability of the boat. When used on inboard ski
boats a single trim tab is used to enhance and control the type of wake desired by
controlling the hull running attitude.
By controlling the wake characteristics, wakes can be made to enhance water
sports such as wakeboarding, barefooting, kneeboarding and towables.
A single tab is usually mounted in the center rear of the hull. Tab movement is
controlled from a helm-mounted switch, which activates an electric or
electric/hydraulic actuator attached to the tab.
When operating at wakeboarding speeds, with the trim tab in the UP position, the
bow rises and the hull rides normally, creating heavy water displacement and
large wakes.
When operating at skiing speeds, with the trim tab in the DOWN position, the bow
lowers and helps the boat to plane quickly for skiing and slalom skiing-type wakes
and allows for pulling more and/or heavier skiers.
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