28
VMAR CHALLENGER 40ARF TRAINER
TM
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STEP 7.4 - CONNECTING THE CON-
TROL RODS TO THE RUDDER AND
ELEVATOR SERVOS.
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7.4.2
Remove the servo arms from your servos one at
a time and orient them to match that depicted in 7.4.1
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7.4.3
Connect the plastic clevises to the middle holes
of the servo arms and screw the clevises in or out on the
rods so that they can be connected to the servo arms.
Ensure that at least 6 mm (1/4 in.) of clevis shank re-
mains on the threaded rods at all times.
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7.4.4
If necessary do a final adjustment to the length
of the two piece throttle control rod assembly installed
earlier by using the two collars and set screws. This two
piece arrangement can accommodate a wide range of
different engine throttles.
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7.4.5
Snap the clevises firmly closed in a middle hole
of the appropriate servo arm.
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7.4.7
Attach an EZ
connector
[EZ]
to the servo
arm opposite from the
rudder. Centre the nose
wheel and cinch down the
EZ connector to the nose
gear steering control rod.
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7.4.8
Position and limit
the side to side and up or
down movement of the nose
gear steering control rod
using one or both of the
small wooden guide blocks
[WGB]
provided. The guide
blocks have a small groove
in one side. Trial fit the
blocks before gluing then
tack the blocks down with
CA glue and epoxy the outer
plastic tube of the steering
control rod into the groove
of the outer block. You may need two of these to guide
the nose gear steering rod properly.
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7.4.9
Remove the tape from the rudder and the
elevator and free up the throttle control arm.
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7.4.10
Turn on your transmitter and then your receiver.
Confirm that the neutral positions are sustained.
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7.4.11
Move the transmitter throttle, rudder and eleva-
tor sticks and ensure that the appropriate control surfaces
move accordingly and in the correct directions.
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Pulling the transmitter elevator stick towards you
should raise the elevator,
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Pushing the transmitter elevator stick away from
you should move the elevator down.
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Moving the transmitter rudder stick to the left
should deflect the rudder to the left and turn the
nose wheel to the left.
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Moving the transmitter rudder stick to the right
should deflect the rudder to the right and turn the
nose wheel to the right.
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Moving the transmitter throttle stick away from
you should open the throttle wider (faster)
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Moving the transmitter throttle stick towards you
should reduce the opening in the throttle (slower)
If any of these movements is reversed, consult your radio
manual regarding servo reversing.
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7.4.1
Consult the following illustration that shows how
the throttle, rudder and elevator servos are positioned and
connected to their respective control rods. The illustration
also shows how the nose gear steering is connected to
the rudder servo.
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7.4.6
Position and secure with CA glue the floating
wooden guide that holds the rudder and elevator outer
guide tubes.
Attach the
wooden guide
to the
nearby former
at a level that
keeps the rods
level with the
servo output
arms. Ensure
that the rods will
not bind when
moved.
2 Piece Throttle Control
Rod Assembly to Throttle
Control on Engine
Steering Control
Rod running to
Nose Wheel
Elevator Control
Rod with clevises
on both ends
Rudder Control
Rod with clevises
on both ends
EZ Connector
Clevis
Servo
Arm
RIGHT
LEFT
FRONT
BACK
EZ
WGB
