X
4
MR
250
MexAir RC
3
Other “stuff” typically installed on a racing multirotor frame includes:
Flight Controller Board
Motors
Propellers
Speed Controls (ESCs)
FPV Gear and cameras
Batteries and Battery Connectors
In some frame designs, including the
X
4
MR
, there are varying options for positioning and mounting
components. We listed options for those that have shown to be useful and tested successfully with the
X
4
MR
s we build in-house.
Recommended Options:
Voltage Regulator(s)
o
Note: If you do not have 5V and/or 12V supplies that may be necessary for your camera
systems, these can be handy add-ons wired direct to the supplied PDB.
Satellite receiver vs. standard receiver?
o
Testing with a Spektrum satellite receiver showed no adverse effects on range or signal
reception. It is a good lightweight alternative to traditional receivers due to small size
and less wiring as might otherwise be necessary. It can be mounted almost anywhere
on the
X
4
MR
airframe.
General Guidance to make assembly faster, easier and safer:
1.
Read through the assembly instructions completely PRIOR to beginning construction.
2.
Inventory all kit supplied parts, your electronics and tools, organizing them according to your
intended build. Do not forget about any general supplies such as solder, heat shrink, small tools,
etc.
3.
Use small amounts of blue loctite thread locker on all metal-to-metal screw contact surfaces,
especially motor mounting screws.
4.
“Dry-fit” and test all electronics and FPV gear, to the extent possible during the build, so
disassembly will not be required after you have completed the frame assembly.
5.
Pre-plan purchase of motors that have sufficient motor wire length and diameter to allow for
embedding the wires into the motor arms. The minimum length of the leads should be 4 inches.
The wire diameter, including insulation, should be a maximum of 1/16” (~20 gauge) to fit into
the arm holes. If larger, the holes can be widened as described in this manual. Alternately, any
wire length or diameter can be used by surface mounting them.
6.
Take care in soldering components to prevent shorting between solder pads or overheating any
sensitive electronic components.
7.
Although the skills, techniques, and “hazards” associated with this build are typical for many
hobby related activities, we always strive for safe and efficient construction techniques. We
therefore repeat here what you have likely learned from your previous experiences:
a.
The
X
4
MR
airframe kit does not require any drilling for the typical build. If drilling
holes in the carbon fiber (CF) for self tapping screws or larger component attachments
use a sharp drill bit and work with light pressure and a relatively high speed drill. CF can
not be “punch marked” for drilling. A small electric rotary tool or drill press is
recommended to prevent the bit from “wandering” as you start the hole. Wear
appropriate safety gear, including air mask/filter, if creating carbon dust.
