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Step 2: Wing Servos & Servo-Wire Extensions:
In this step you will be installing the wing-servos onto the wing-servo access covers and placing the
wing and elevator servo-extension cables in the wings and fuselage respectively.
Hardwood Mounting Blocks
:
Locate the four hard-
wood servo-mounting blocks. On two of the blocks, cut a
notch ~ 1/4” x 1/4” to accommodate the servo wire. A 1/4” rattail file
works well for this job. Round the edges of the cut to prevent abrad-
ing or cutting the servo wire. Make sure the cut is oriented such that
the servo screws will go in the block’s cross-grain.
Prepare the wing-servo Access Covers
:
On both
wing servo covers, measure the width of the opening-notch
and mark the center of the opening. You will be aligning the servo
arm with this mark. Marking both sides will make it easier to align the
servo. The servo-cover only goes on one way. Please observe that
the notches face toward the wing tips; therefore, the servo-arms in
each wing panel face in opposite directions; i.e.; toward the wing tip.
Mount Servo to Hardwood Blocks:
Place the wood
servo blocks against the servo mounting tabs as shown left. Place 2
- 3 pieces of 20 pound paper beneath the servo to raise it off the
surface slightly. While holding the blocks against the servo mark the
mounting holes with a pencil or a punch. Predrill the blocks with a 1/
16” drill bit and mount the servo to the blocks using the servo
manufacturer’s supplied screws.
Now is a good time to mechanically center the servo arms.
Connect the servo to the receiver’s aileron port and turn on your re-
ceiver and transmitter. With the aileron controls (stick, trim, sub-
trims, centering) set to neutral, mechanically mount the servo arm on
the servo shaft, such that it is perpendicular or square with the cover
surface. Repeat this process for both wing servos.
Epoxy Servo Blocks to Cover Plate:
Remove the paper spacer from under the servo and place a
piece of wax paper between the servo, the blocks and the cover plate
to prevent epoxy from getting on the servo. Realign the servo and
mark its position. Mix the two-part, 30-minute epoxy and apply to the
block, reposition the servo on the cover and clamp. Set aside and
repeat process on the other wing servo. Remove wax-paper when
cured.
Install Servo Extension Cables:
Locate the servo extension cable-hole on the top of the wing
near the root rib. Cut an “X” in the covering over the hole. Hold the
wing vertically, with the tip down and feed the 18” extension wire through
the wing and into the servo box. Dress the cable through the hole and
tape-off both ends so that you do not lose the wire. Be sure to note the
“sex” of the connectors so it will mate with the servo connector. (The
Female cable-end goes into the servo box.)
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