X
4
MR
250
MexAir RC
7
c.
When initially dry-fitting the motor in the following sections and on final tightening
of the motors, verify that the motor shaft is centered in the arm shaft hole and that
there is sufficient clearance from any shaft hardware. Some motor shafts have a clip
or setscrew that secures the shaft in the motor. Visually verify that the clip/setscrew
will not contact the edge of the hole. Turn the motor rotor by hand and again verify
sufficient clearance all the way around.
d.
Embedded Wire Option (for typical 20 gauge motor wires – size for many high power
2000KV motors)
i.
It is possible to widen the three motor wire holes for wire sizes greater than
20 gauge using a small, round needle file inserted at an angle toward the
arms body end. The hole is already predrilled at an angle to allow pushing
the lead through and toward the body without binding. The intent here is to
ultimately thread the leads into the three holes and into the arms cavity and
out to the body end leaving sufficient wire to reach the solder pads or
connectors with some excess. The excess allows the arm to pivot to its
maximum angle without tightening or binding.
ii.
Align the motor mount holes to the motor mounting slots of the arm with
the motor wires facing the three motor wire holes in the arms. Verify that
there will be sufficient wire to reach your intended ESC solder pad locations
or connector. A minimum wire length of about 4 inches is necessary. If not,
use the “Surface Wire Option” described below. A solder joint will not fit
through the hole unless the hole is widened as described above.
iii.
If your wires have pre-installed connectors, they must be removed. If the
wire insulation is not uniquely colored, note which wire is threaded into each
hole by tagging or marking the bare end after each is pulled through. This
will aid in attaching to the correct pads on the ESCs for proper motor
rotational direction. This step may not be necessary should your ESCs have a
reverse motor option and you plan on setting direction using this ESC feature.
iv.
Avoid kinking the wire/insulation while snaking the motor wires into the
holes and out the other end. There is a curvature to the channel so it may be
necessary to give the end of the wire a slight bend to follow the curve near
the exit of the channel. First insert the outermost motor wire into the
corresponding hole. Gently push the wire through the arm until you can pull
it out at the body end. The middle wire is next then the third. It may take a
couple of tries until you get the hang of it – and yes – it can be done! You
may need to manipulate the wires past the leg hole in the arm if it hangs up
there. You will be able to see the wire through the leg hole and manipulate it
Needle File to Open Motor Wire
Holes ONLY if Necessary
