42
IV
STAINLESS STEEL
Some Cobalts are standard equipped with stainless propellers. In this instance, do not
substitute aluminum propellers. Adverse handling and top speed characteristics may be
experienced.
PULLING POWER
If you need extra pulling power, you can obtain this by decreasing the pitch of your
propeller(s) by two degrees. This will not endanger the engine or drive unit as long as
the manufacturer’s recommended top RPMs are not exceeded.
DRIVE UNIT TRIM
Trim angle is the angular relationship between the drive unit and the transom of the
boat. Boat trim while underway greatly affects the performance and efficiency of your
boat. For best results, the boat should be on plane and trimmed to reduce the amount of
the boat’s hull in the water (known as wetted surface). With less boat in the water, both
speed and fuel economy increases. Continuous trim adjustment is required when
operating your boat to maintain maximum performance and efficiency.
If the drive units are trimmed in too far (closer to the boat bottom), speed drops, fuel
economy decreases and the boat may not handle correctly. However, it does provide
better acceleration from a stand still; and because it forces the bow down, visibility is
improved. If the drive units are trimmed out too far (away from the boat bottom),
steering torque may increase, the boat may be difficult to get on plane, and may bounce.
To use power trim effectively, start with the drive units trimmed in. As the boat planes,
increase the angle out. Experience is the best teacher for understanding proper drive
trim.
CORRECT
IN TOO FAR
OUT TOO FAR
UP
TRIM
DN
UP
TRIM
DN
UP
TRIM
DN
O
PERATING
I
NFORMATION
C
OBALT
B
OATS
- O
WNER
’
S
M
ANUAL
KC-1157
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