Chaparral 420 PREMIERE, Owner'S/Operator'S Manual

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in. To correct over-trimming, push the bottom halves
of BOTH rockers to achieve the directed angle.
You can also use the two trim tabs on the transom
to trim your yacht. The rocker switch should be oper-
ated at momentary bursts to achieve proper control
of the hull.
When running wide open, you will most likely not
need to trim unless heavily loaded.
In choppy water or when running in an inlet, the best
way to maneuver is with a bow high attitude. To
ensure that tabs are full up in the zero position, push
the bottom halves of both rockers for several seconds.
Your yacht is designed to run at a particular speed and
weight distribution. The stern will settle lower in the
water and the hull will push a hill of water when speed
decreases or weight increases. You will need to
increase drag and power to move through the water.
Electric trim tabs are adjusted independently of
each other, enabling adjustment for uneven loads in
the boat by allowing the operator to trim up either
one or the other side of the boat.
Properly Trimmed Boat
Your boat will work best when it is trimmed to run at
an angle between 3 to 5 degrees to the water (bow
slightly up). A properly trimmed boat will:
• Reduce drag and increase fuel efficiency
• Provide a smoother, safer, and quieter ride
• Retain good forward visibility
Use short bursts of rocker switches to adjust the trim
tabs. Pushing the switches too far at once may cre-
ate steering issues. Adjusting one trim tab more
3-12
BOW-DOWN (PLOWING)
PROPER TRIM (3-5” BOW-UP ANGLE)
BOW-UP (PORPOISING)
EFFECTS OF PORT AND STBD TRIM TAB ADJUSTMENT
PORT TAB DOWN
TO PUSH
PORT STERN UP
STBD BOW DOWN
BOTH NEUTRAL
NO CHANGE
IN LIST
STBD TAB DOWN
TO PUSH
STBD STERN UP
PORT BOW DOWN
Figure 3.13 Effects of Trimming
ZINC ANODES
SWIM
PLATFORM
(UNDERNEATH)
SWIM
PLATFORM
BRACING
PORT SIDE SHOWN (STARBOARD IS TYPICAL)
ZINC ANODES
TRANSOM
Figure 3.12 Electric Trim Tabs