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Yamaha F40C Manual Del Propietário página 96

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Bow up
When the boat is on plane, a bow-up atti-
tude result in less drag, greater stability
and efficiency. This is generally when the
keel line of the boat is up about 3 to 5
degrees. When trimmed out, the boat
may have more tendency to steer to one
side or the other. Compensate for this as
you steer. The trim tab can also be adjust-
ed to help offset this effect.
Too much trim-out puts the bow of the
boat too high in the water. Performance
and economy are decreased because the
hull of the boat is pushing the water and
there is more air drag.
Excessive trim-up can cause the propeller
to ventilate, which reduces performance
further. When trimmed-out too much, a
boat may "porpoise" (hop in the water),
105011
which could throw the operator and pas-
sengers overboard.
Bow down
When the bow of the boat is down, it is
easier to accelerate from a standing start
onto plane.
Too much trim-in causes the boat to
"plow" through the water, decreasing
105013
fuel economy and making in hard to
increase speed.
Operating with excessive trim-in at higher
speeds also makes the boat unstable.
Resistance
increased, heightening the danger of
"bow steering" and making operation dif-
ficult and dangerous.
1 Bow up
2 Bow down
3 Optimum angle
105015
3-17
at
the
bow
is
GB
greatly

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