X
4
MR
250
MexAir RC
11
c.
With the motor arms held loosely in place, thread the aluminum cone nuts onto
their respective threaded rod (rear arm) and 4-40 SS screw (front arms). The cone
nut should be threaded on so it will leave sufficient thread for spacers and
engagement with the knurled nuts. See the preceding pictures. All standoff knurled
nuts should then be tightened snugly by hand. Note that the supplied cone nuts
holding the rear motor arms in place are tightened by turning the top knurled nut.
The front arm set is tightened by turning the supplied 4-40 steel screw. Do not over-
tighten.
d.
Attach the bottom plate using the aluminum spacers and nylon thumb-nuts. Each
motor arm uses a 5mm spacer and the middle spacers are made up of two 7mm
spacers each or a 9mm plus 5mm spacer (depending on what is supplied in your kit).
Tighten the plate firmly. Readjust the hardware placement if necessary.
e.
Take the main frame by hand and apply a moderate twisting force to the main frame.
The frame should feel solid as if it is one piece. If there is any noted slipping or twist,
verify that all standoff fasteners are properly tensioned.
f.
Landing Gear Installation [Note: Nylon landing gear can be cut to desired length]
i.
Embedded Motor Wires
1.
Looking through the landing gear holes you will likely see that the
motor wire(s) may interfere with the landing gear (LG) installation.
Using any thin blunt object simply move the wires to the side and out
of the way. There is enough space in the cavity to make room for the
LG. Install the LG screws.
ii.
Surface Mounted Motor Wires
1.
If the wires cover the landing gear (LG) holes, move the wires apart to
make room for installing the LG and prevent pinching a wire under
the LG head. Install the LG screws. The wires may be moved back
and rest on top of the LG head.
iii.
Slide the plastic boot over the leg. The boot may fit tightly and may need to
be “worked” onto the leg. When installed, it should not come off easily. If
loose, remove the boots and place a small amount of RTV / Silicone Seal or
similar pliable glue to the lower threads of the legs. Fit the boots back over
the leg and stand the completed airframe on a flat surface until the glue
hardens securing the boots in place.
Landing Gear Screw and Boot Installed
