Futaba 6DA User Manual

Page 12

• Move the throttle stick to full

throttle. Does the barrel of the
engine’s carburetor open
completely? Does it open
completely before the servo has
moved its full distance, so the
servo is pushing against the barrel
at full throttle causing the servo to
“buzz” or the pushrod to flex?
Always correct the throw as
closely as possible by adjusting
the linkage. Then use the Throttle
High EPA pot to fine-tune the full
throttle setting.

•

Now close the throttle
completely, including pulling the
throttle trim closed. Does the
barrel just close completely on
your engine as the trim hits
bottom? If not, adjust the Throttle
Low EPA pot until it does, so the
engine can be shut off safely
from the radio.

Servo

Buzzing

Pushrod

Bowing

When adjusted

correctly, there is no

servo buzz or bowing

of the pushrod

Turning the Throttle High

EPA pot counterclockwise

decreases the throttle

servo travel.

THROTTLE END POINT ADJUSTMENTS (EPA)

BEFORE

AFTER

• Read your model’s instructions to

determine the proper distance
each control surface should move.
This is called “throw.” If the model's
instructions specify a “High” and
“Low” rate, use the High rate here.
With the dual rate switches in the
“off” positions, move each control
its full distance and measure the
throw. Note that it is very common
for your initial installation/set up to
provide you more or less
movement of the control surface
than is desirable to fly the aircraft.

• Always adjust the throw as closely

as possible first by moving the
clevises in or out on the model's
control horns and servo arms.
(Using AST settings below 80%
will significantly affect the precision
of the servos’ response to your
commands.) If needed, adjust the
AST pots for each surface until the
proper throw is set.

Too Much Throw

Correct Throw

ADJUSTABLE SERVO TRAVEL (AST)

BEFORE

AFTER

Turning the AST pot

counterclockwise

decreases the servo’s travel

at full stick deflection.

1. Move the throttle stick

to full up.

1. Move the stick to

full deflection.

3. Adjust the proper

AST pot.

4. Confirm

the throw is

correct.

2. Measure the

throw.

2. Adjust the servo's

end point.