
Mountain Models Magpie
16
Attaching the ESC
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The speed controller (ESC) is attached to the side the fuselage with the supplied
Velcro. Do not make a cutout in the fuselage for the ESC as the ESC must be
exposed to the air for cooling. Connect the battery to and the motor to the ESC,
following the guides on the controller itself.
Step 8: Finishing the Kit
Well, you’re almost there…the end is in sight; just a few more steps and you can go flying,
assuming the weather is cooperating.
Setting the Center of Gravity
The Center of Gravity (CG) will affect how the airplane recovers from a nose up or nose
down condition (pitch stability). With the CG too far forward, the plane will be quite stable,
but require a lot of up elevator to fly level. This will result in an increased low end speed. On
the other hand, too far back and the plane will be hard to control, requiring constant input
to keep the plane flying straight and level. Set the CG .25”-.5” behind the rear of the wing
spar. You adjust the CG by moving the battery as follows.
Attaching the Battery (LiPolys)
1.
Cut the rough side of the Velcro strip down to 3" in length, and then attach it to the side of
the fuselage.
2.
Attach the soft side of the Velcro strip to the side of your battery pack.
Attaching the Battery (NiMH)
1.
First you need to find out where the battery needs to be to balance the plane. Set the
battery on the plane and position it such that the plane balances properly. This must be
done with the plane completely ready to fly with everything installed.
2.
Once the battery position has been determined, you can cut a hole in the side of the
fuselage to hold the battery. The hole should be slightly snug to keep the battery secure.
Use a sharp xacto blade to cut the hole.
Setting the Control Throws
You need to adjust your radio trim so that the elevator, rudder, and ailerons are all level.
The throws are as follows:
Low Rates
High Rates
Elevator
+-.5 inch
+-1 inch
Rudder
+-.75 inch
+-1.25 inch
Ailerons (SP)
+-.5 inch
+-1 inch
If you are new to flying, set up your controls so that the maximum deflections measured
from the furthest point back on the control surface, are what is specified in the low rates
column. The plane will be fairly gentle set up as such. If you are brand new to flying and
will be teaching yourself, you might want to set the rudder throws to +- .5” and the elevator
to about 3/8”. These soft controls will help to keep you from over controlling.