the horn in this position and use a pencil or sharp awl to mark the
mounting hole locations for the control horn onto the flap surface.
d) Drill a 3/64" dia. (or #56) pilot hole into the aileron at both
marked locations. Be careful not to drill completely through the
aileron! Mount the control horn in place using two T2.6 x 12 mm
PWA Screws.
e) Repeat this process for the second aileron.
❑
8) Turn on your radio system and double check the movement
of the ailerons. If there is any binding, find the cause and correct it
now.
Then, refer ahead in this manual to the section titled
CONTROL MOVEMENTS to read the recommended travel amount
for the ailerons. Use the EPA (End Point Adjustment) feature of
your transmitter to yield the recommended amount of aileron travel.
SAFETY ISSUE: After centering the servos and setting the control
throws, "safety" each R/C clevis by slipping a short length of fuel
tubing (not supplied) over the clevis, as shown in many of the
photos. This will prevent the clevis from opening up and becoming
disconnected from either the control horns or the servo arms.
❑
9) FLAP HOOKUP: Unlike the ailerons, the flap servos both
need to travel in the same direction. The easiest and most convenient
method to achieve mirror image movement of the flap servos is by
using a Reversing Y-harness. Many radio manufacturers make them
for their systems.
If your radio manufacturer does not make a
reversing Y-harness, the option is to purchase an aftermarket
Reversing Y-harness like the Maxx Products
®
"Miracle Y".
a) Plug the two flap servo leads into the dual leads of the
Reversing Y-harness, and then plug the single end of the Y-harness
into the receiver channel you are using for the flaps.*
*Note: Which channel to use for flaps? Some transmitters have
toggle switches to activate the flap channel. These are typically
two or three position switches that give one or two pre-set flap
angles upon activation. While this works fine in many cases, we
much prefer a rheostat type knob that allows us to roll in as much
or as little flap input as needed for the wind conditions during any
given flight. Check your radio manual to figure out the best way to
operate the flaps on your P-51B Mustang.
b) Make sure your transmitter's flap control (knob or switch) is
set to the "flap up" position, and then, turn on the radio system.
The correct position for both flap servo arms when in the flap up
g) Use your radio system to center the servo and check servo
travel. Install the servo arm. Check to see that the arm does not
bind on the slot in the hatch at extremes of travel.
Note: If you have a double-sided servo arm, cut off the side of the
arm that you won't be using so that it cannot bind on the top wing
sheeting when the hatch/servo are installed in the wing.
h) Repeat steps a) through g) to mount the other aileron and
flap servos to their hatches.
❑
6) From the kit contents, locate (4) Nylon Control Horns, (8)
T2.6 x 12 mm PWA Screws for mounting the control horns, (2)
Complete Aileron Pushrods, and (2) Complete Flap Pushrods.
❑
7) AILERON HOOKUP: For this step you need to plug the
two aileron servo leads into the dual leads of a standard Y-harness.
Install the single end of the Y-harness into the aileron slot in the
receiver. Turn on the radio system and center the aileron trim lever
on the transmitter. Check to see if the aileron servo arms are
both perfectly centered on each servo -- the arms need to be
perpendicular to the servo body when the servo is at neutral. If
necessary, take the servo arm off the servo and reposition to make
it perpendicular. Next, move the aileron transmitter stick to test for
correct direction of travel and full motion of the servos. Note that
the aileron servos should be moving in opposite directions to each
other.
a) Notice that Aileron Pushrods have an adjustable clevis on
one end and a non-adjustable clevis on the other. Connect the
non-adjustable end of the Aileron Pushrod into the outermost hole
of the aileron servo arm. (Note: If the clevis pin is hard to snap into
the hole in the servo arm, open up the hole with a 1/16" drill bit.)
b) Install a Nylon Control Horn on the adjustable clevis end of
the pushrod, using the top or outermost hole in the horn.
c) Hold the control horn in place at the leading edge of the
aileron hinge line. Thread the adjustable clevis in or out to allow
the base of the control horn to rest flat on the surface of the aileron
with its front edge right at the hinge line. Move the control horn
right or left as needed to position it in line with the servo arm. Hold
8
IMPORTANT:
After mounting the control horns for the first
time, take them back off and put a few drops of Thin CA into
each of the screw holes in the aileron. The Thin CA will soak
into the threads in the wood, and when it dries, the holding
power of the threads will be much stronger. Use Thin CA only,
not medium or thick CA. Let the Thin CA dry completely before
remounting the control horns onto the ailerons.