Futaba 3EG AM - Manual (Page 9)

•THROTTLE -> RUDDER MIXING
ADJUSTMENT
The rudder neutral position at engine SLOW
and engine HIGH depends on the engine
torque. When adjusted for straight ahead
when a common 2-cycle glow plug engine is
at HIGH, the boat will slowly swerve to the
left at SLOW and if adjusted for straight
ahead when the engine is at SLOW, the boat.
will slowly swerve to the right at HIGH. Mix-
ing from throttle to rudder, the biggest
feature of the Model FP-3EG, completely
eliminates this tendency.
The following description is for a common 2-
cycle glow plug engine that rotates counter-
clockwise. Reverse the description for a gasoline
engine, electric motor, etc. that rotates clock-
wise.
This mixing is adjusted with the mixing
trimmer and limit point trimmer at the left
front of the transmitter.
Mixing trimmer 6 adjusts the amount and
direction of movement of the rudder servo
when the throttle stick is moved up and
down. The mixing amount is zero at the
center position.
Limit point trimmer 7 changes the point at
which the operating line of the mixing
amount to the rudder servo curves when the
throttle stick is moved from LOW to HIGH.
1 When the throttle stick is set to HIGH, a
boat moving straight at engine control
SLOW will swerve to the right. On the
other hand, a boat moving straight ahead
at throttle HIGH will swerve to the left
when the throttle stick is set to SLOW.
That is, the rudder servo should be turned
to the right when the throttle stick is set
to SLOW.
2 Turn the mixing trimmer with a screw-
driver so that the rudder turns slightly to
the right when the throttle stick is moved
from HIGH to SLOW.
You should now have a good understanding
of throttle to rudder mixing.
Throttle -> rudder mixing will be called
"MIX" hereafter.
3
• Run the boat without MIX (MIX trimmer
at center) and check the rudder neutral,
play, and engine SLOW and HIGH.
• Limit point
Turn the trimmer about 2/3 clockwise.
(In the L to H direction.)
•Under this state, turn the MIX trimmer
about halfway in the R (right) direction
and check the rudder movement (rudder
servo) while moving the throttle stick up
and down. The rudder should move a little
to the right at SLOW and a little to the left
at HIGH.
•Set the MIX trimmer to zero (center) at
throttle stick HIGH. The rudder servo
should not move because the mixing
amount is zero at throttle HIGH as shown
in Fig. 11.
4 After all preparations are complete, make
adjustments while actually running.
A Adjust the rudder trimmer so that the
boat travels straight ahead at throttle
HIGH.
B Set the throttle stick to SLOW. If the
boat swerves to the right at this time, the
MIX amount is excessive. Reduce the
MIX amount by turning the MIX trimmer
toward the center. If the boat slowly
swerves to the left, the MIX amount is in-
sufficient. Increase the MIX amount by
turning the MIX trimmer in the R direc-
tion.
C This completes MIX adjustment at throt-
tle SLOW and HIGH. However, adjust-
ment near medium SLOW is still neces-
sary. To adjust near medium SLOW,
proceed as follows:
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