46
4. Servo Arrangement.
"REVERSE" SERVO CAN BE IDENTIFIED BY A
DOT IN MOUNTING FLANGE AS SHOWN HERE, OR
A DIFFERENT COLOR CASE OR MARKINGS.
CONTROL MOVEMENTS ARE THE SAME
AS IN A FULL-SIZE AIRPLANE
With throttle servo at forward position, place servo so
output wheel is on same side as engine throttle arm.
Rudder servo should be on side opposite to throttle
servo so it can drive the nosegear steering arm in a
nearly straight line.
In radio sets without "servo reversing" feature, the rud-
der servo is usually a "reverse" servo. A "reverse" servo
can be identified by a dot, or a different color case or
markings.
Elevator servo occupies remaining rear position.
5. Servo Movements
As mentioned in the introduction on page 2, radio sys-
tems with "servo reversing" simplify radio installation.
With a regular non-reversing system, you must match
each pushrod to its corresponding servo's rotation. With
"servo reversing," pushrods can be hooked up to either
side of the servo s output wheel, and after checking the
control response, a servo responding in the wrong direc-
tion is easily, switched to correct action (see your radio
manufacturers instructions).
The 2+1 arrangement on the plan shows standard servo
placement for a "servo reversible" system. For either
type of radio system, check your equipment out with the
following procedure.
Push the transmitter (Tx) throttle lever up away from you,
and observe where throttle servo wheel should connect
to the throttle pushrod to give full throttle, Mark this on
the servo wheel (write on tape). Return throttle lever to
full down (idle position).
Ailerons ("A" or "B" wing). Move the aileron stick to the
right, and observe that the right aileron must be connect-
ed so it moves up.
Move the elevator stick up, and observe where the ele-
vator pushrod must be attached to the elevator servo to
pull the elevator down. Mark servo.
Move rudder stick to the right, and observe where rudder
servo wheel should connect to give right rudder and
nosegear steering. Mark this on the servo wheel.
Remember, for non-reversing radios, that the rudder
servo usually needs to be a "reverse" servo.
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