Scout Boats 221 Winyah, Руководство пользователя, Страница: 94 / 150

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WARNING
TEAK SURFING (HOLDING ONTO THE SWIM PLATFORM WHILE
BOAT IS UNDERWAY) IS EXTREMELY DANGEROUS AND CAN
CAUSE SEVERE INJURY OR DEATH. TEAK SURFING PUTS
AN INDIVIDUAL DIRECTLY IN THE PATH OF THE BOAT’S
EXHAUST AND EXPOSES THEM TO POISONOUS LEVELS OF
CARBON MONOXIDE. IT ALSO EXPOSES AN INDIVIDUAL TO
THE POSSIBILITY OF BEING THROWN INTO THE PROPELLERS.
YOU SHOULD NEVER ALLOW ANYONE TO TEAK SURF BEHIND
YOUR BOAT OR TO BE IN THE WATER NEAR THE LADDER OR
SWIM PLATFORM WHILE THE ENGINE IS RUNNING.
12.13 High Speed Operation
With some engine options, your boat will be ca-
pable of achieving speeds in excess of 50 MPH.
High speed operation requires the full attention of
the operator and strict precautions to avoid loss
of control and/or engine damage.
The operator should always have the emergency
stop switch lanyard attached to a belt loop before
operating at high speeds. This will immediately
stop the engine if the operator is unexpectedly
thrown from the helm or out of the boat. Always
keep one hand on the throttle and be ready to
immediately slow down if handling difficulties oc -
cur or when approaching boat traffic, boat wakes
or rough water. Never operate your boat above
idle speed without the emergency stop lanyard
attached to a belt loop.
Engine Height and Trim
Trim and engine height is critical at high speeds.
Excessive trim or engine height can cause your
boat to become difficult to handle at high speeds.
This can cause loss of control or severe engine
damage. You should be aware of the maximum
trim angle and engine height for your boat and
never exceed those limits when operating at high
speeds.
Boats with a Jack Plate
If your boat is equipped with a jack plate, you
should be aware of the maximum safe height set -
ting for the engine while operating at high speeds.
When the engine is set too high, the propeller will
be too close to the surface of the water which
can cause cavitation or propeller slip. This can
cause the engine RPM to exceed safe limits and
damage the engine. Cavitation also reduces di-
rectional control and can cause lose of control at
high speeds. A light, less responsive feel in the
steering is an indication that the engine is too high
and you should slow down immediately.
You must also be aware that water intake for the
engine cooling pump can enter turbulence when
the engine is too high. This will reduce the ef-
ficiency of the pump and could damage the pump
impeller and/or cause the engine to overheat.
Engine Trim
Engine trim is important at any speed, but is
critical at high speeds. The most efficient angle
for an outboard’s gear case to run is parallel with
the water. When your boat is trimmed properly,
steering wheel torque is minimal and the front of
the boat is slightly (2 or 3 degrees) above parallel
to the surface.
Make sure you don’t over trim. Over trimming,
setting engine trim to high, will cause hard steer-
ing and propeller cavitation. An over trimmed
engine not only slows the boat, it can make the
boat hard to steer and could cause the engine
RPM to exceed safe limits causing damage to
the engine. Additionally, over trimming at high
speeds causes excessive hull angles which allows
air pressure from the wind to lift the hull at high
speeds. This wind pressure can cause the hull to
lose contact with the water and become unstable.
Always slow down to a safe speed immediately and
adjust the trim angle if you accidently over trim
the engine while operating at high speed.
Chine Walk
Chine walk is a back-and-forth wobbling of the
hull created by the effects from propeller torque
and hydrodynamic forces when the boat is over
trimmed while operating high speed. Chine walk
can be dangerous and can cause the operator to
lose control of the boat if it becomes excessive.
Under certain conditions all V-hulled boats can
develop chine walk at high speeds no matter how
well the boat is designed.
Chine walk occurs when an excessive hull angle
allows wind pressure to lift the hull from the water
to the point where there is not enough hull mak-
ing contact with the water to counteract propeller
torque and balance the boat. This causes the
hull to wobble side to side or chine to chine. The
wobbling typically gets worse quickly if it is al-
lowed to continue and can cause the operator to
lose control. If the wobbling becomes excessive,
then each chine can alternately catch the water as
the boat rocks from side to side (hence the term
“chine walking”) and cause the boat to spin out
of control. In extreme situations, the spin can