Trimming - Glastron Boats User Manual

TRIMMING

TILT/TRIM Control Switches
1. The standard trim control switch is usually located on
the control lever handle. See your dealer for a com-
plete explanation of trim control switch.
2. The switch controls the "trim" of your boat under vari-
ous conditions, loads, and uses. Proper trim is very
important in boating. Trim refers to the angle of the
lower unit in relation to the bottom of the boat.
3. In the case of low or heavy bow attitude, the lower unit
is normally trimmed too far under or forward. Trim the
unit out or up to correct this situation.
4. If the bow is too high, your drive unit is trimmed up or
out too far. Trim IN to correct.
5. A good practice is to get underway (especially when
fully loaded or pulling a skier) with the unit trimmed all
the way under or IN. After the boat is on plane, adjust
the trim out slightly to obtain the proper bow attitude
and engine RPM.
6. Trim also affects propeller selection and fuel efficiency.
All models should be "propped" to attain the maximum
recommended engine RPM in mid–trim position. It
should not be necessary to run your boat at maximum
trim. Never trim the lower unit to a point where the
propeller cavitates or slips, which is evident by a rapid
increase in engine RPM.
7. On performance boats, trimming out, in addition to rais-
ing the bow, also lifts the boat higher, gaining speed
because of less hull in the water.
W ARNING: Excessive trim will decrease maneuver-
ability, change steering characteristics, and may cause
"porpoising" (bow oscillates up and down) or "chine
walking" (rocking from side to side). USE POWER
TRIM WITH CARE.
8. The high–tilt trailering position of the stern drive is con-
trolled by a separate switch which is located on the
control handle, dash, or switch panel. Do not activate
this switch while underway. This can severely damage
the lower unit.
NOTE:Refer to your drive unit(s) instruction manual or
your dealer, regarding the power trim controls installed on
your boat.
Gives maximum performance
INCORRECT
Causes boat to "plow"
FIGURE 3.3 – TRIM / MOTOR ANGLE
TILT/TRIM Control Switches - Outboards
On outboard engines equipped with power trim, read the
instructions provided by the engine manufacturer for cor-
rect usage.
3.13
CORRECT
INCORRECT
Causes boat to "porpoise"