Mountain Models Magpie
14
You should center your servos before you hook them up to the pushrods. To do
this: Connect your servo to your receiver, connect your ESC to your receiver, turn
on your transmitter, and then connect your batteries to your ESC. Your servos will
move to a neutral position, assuming all of your radio trims are set to zero (0).
1.
Press the servos into the slots you made in the fuselage build. You will need servo
extension cables as your servo cables will not be long enough to reach the receiver.
You can either tape the cables to the side of the fuselage or cut a slot into the
fuselage as shallow as possible and press the wires into the slot. Close the slot up
with tape.
2.
The pushrods are made from two pieces of 1/32" x 5.5” music wire with a Z bend on
one side. One Z bend goes in the servo horn and the other Z bend goes in the rudder
or elevator control horn. The two wires are joined with a piece of heat shrink tubing.
Be very careful shrinking the tubing as the foam melts easily. Once the pushrods
are adjusted to the correct length, where the servo horn is centered and the tail
surface is straight back, carefully place a drop of thin CA on the end of the heat
shrink so that it will wick into the tubing. This creates a very strong joint.
3.
If you have the SF wing, skip ahead to the next section.
4.
cut a 45 degree bevel in the ailerons, ensuring that you make a right and a left
aileron (the bevel is on the opposite side on one). Using packing tape as a hinge,
attach the ailerons to the wings so that the outer edge of the ailerons are flush with
the outer edge of the wings.
5.
Glue the control horn reinforcement plates and control horns into the top of the
ailerons.
6.
Cut out a hole for the aileron servo as you did with the other two servos. The hole
can go through the wing to get the servo wire out the bottom of the wing.
7.
Make up two more pushrods as you did above but cut the wire to 4.5”. Attach as
shown.
8.
The ailerons should be aligned so that they are halfway between the top curve of the
wing and the bottom.