X
4
MR
250
MexAir RC
6
2.
There are two possible locations to mount the PDB and/or controller board. Note that
there are six standoff hole locations. Use either the forward or rear sets depending on your
needs. The rearward set places the controller more toward the center of the body – closer
to the center-of-gravity. Flight testing using a Naze32 in both forward and rearward
positions did not seem to affect performance – so it becomes a matter of personal
preference. Install four PDB standoffs “upside-down” as shown in the accompanying figure.
The nylon screw is hidden within the frame body minimizing any possibility of interference
with motor arm placement. The female end of the standoff is placed over the 3mm hole on
the main frame top and the screw is inserted into the frame 5mm hole from the underside.
Hand-tighten the posts to their respective screws by holding the screw in place with a
screwdriver. Complete tightening using the screwdriver while holding the standoff in place.
Take care not to over-tighten the standoff and shear off the screw. For added assurance to
prevent the screw from ever backing off, a small dab of RTV/Silicone Seal can be placed on
the threads using a toothpick. The screw can be removable if necessary. Alternately, a drop
of CA can be used while the frame is held upside-down. This will be permanent and any
future standoff removal will require breaking off the standoff and replacing it with a new
one.
3.
Installing the motors
a.
Verify the appropriate length of your motor screws and always mount them so there
is sufficient thread into the motor frame, but not so much as to touch the internal
components. Doing so will damage your motor. If your screws will not work and
you have motors with 3mm mount threads, the set of 3mm motor screws included
in the kit will likely work for you.
b.
For screws less than 3mm diameter you may need to install the screws with a flat
washer to increase their contact surface area against the CF skin.
Screws Placed in
5mm Holes From Bottom
Screws Pushed Through
To Other Side (Top)
Standoff Placed over 3mm
Hole on Top & Threaded to
Screw
