Formula 2008 5-20 Fastech, Руководство по обслуживанию

Страница: 75 / 122

7-9
FORMULA
OPERATION
FASTECH
1. Intended Course
2. Traveled Course
3. Wind/Current
4. Leeway
TRIMMING-DRIVE UNITS
AND TRIM TABS
Boat trim while on plane is influenced by load
distribution, drive unit trim and trim tab trim.
Determining the best boat trim while underway
takes time. It is best to experiment with different
drive and tab trim combinations while taking note
of the condition.
Drive Unit
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 increase.
Continuous trim adjustment is required when
operating your boat to maintain maximum
performance and efficiency.
Effects of Wind/Current
Figure 7-7
3
4
1
2
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.
FOR193
MODERATE TRIM OUT
FULL IN
EXTREME TRIM OUT
Drive Angle Trim
Figure 7-8
FOR216