the control horn from the R/C link.
Drill two 5/64" dia. holes
through the elevators, at the two marks just made - take care to
make these two holes at 90
O
to the elevator surface and parallel
with each other.
Insert two M2 x 20mm bolts into the control horn base and insert
the two bolt ends into the two holes just made. The flat nylon
mounting base part is designed to be tapped by the mounting
screws. However, on a model of this size, we prefer to use nuts to
secure the horn bolts, so we drilled out the two holes in the base
part with a 5/64" bit. Place the nylon base onto the exposed bolt
ends, on top of the elevators, and thread the two M2 hex nuts in
place. Firmly tighten the bolts and nuts. Remove the tape holding
the elevators in neutral and turn the radio system on to test the
action of the elevators. The correct amount of surface movement
will be set shortly. Re-install the servo output arm retaining screw.
❑
2) Use a piece of masking tape at the top of the rudder to hold
it in neutral to the fin. Make sure the rudder servo output arm is
centered on the servo. Turn the radio system on and turn the
fuselage over, upside down on your work surface.
Center the R/C links on both threaded pull-pull fittings, leaving
equal amounts of adjustment in either direction. Slide a brass
swage tube onto one of the pull-pull cable ends. Thread the cable
end through the hole in the pull-pull fitting. Thread the end of the
cable back through the swage fitting. Connect the R/C link to the
rudder control horn, using the second hole from its tip. Pull the
loose end of the cable taut and slide the swage tube up toward the
end of the pull-pull fitting, to within about 3/8" or so. Test the cable
with finger pressure. The idea is to set the cable straight, without
being too tight. Use needle nose pliers to firmly crimp the swage
fitting in the center. Repeat this procedure on the opposite pull-pull
cable.
Remove the piece of tape holding the rudder to the fin. Check the
rudder's position with the fin - it should be in neutral. If not, adjust
the R/C links as needed to set the rudder at neutral. Test the
action of the rudder with your transmitter. It should move smoothly
and travel fully left and right to each elevator without touching.
With the fittings now adjusted and set, tighten the knurled nuts on
the pull-pull fittings firmly to the rear of each R/C link. Bend the
loose cable ends firmly to 90
O
against the swage tubes and trim
the excess cable with wire cutters.
❑
3) The tailwheel centering springs are now attached to the
tailwheel steering arms (just above the tailwheel itself) and the
aluminum rudder steering arms, previously mounted to the bottom
of the rudder. These springs are installed and bent to impart just
a little tension on the tailwheel bracket, centering the tailwheel
itself to the rudder. Install the two springs as shown making sure
the tailwheel is centered with the rudder when it is in the neutral
position. Bending the spring ends precisely and neatly is a lot
easier using small needle nose or round nose pliers.
RADIO INSTALLATION:
At this point, the radio installation is all but complete. The only
remaining tasks are mounting the on/off switch, packing the
receiver in foam and placing it in the fuselage, routing the antenna
and final placement of the battery pack (the battery pack will not
be secured until the final C.G. is established).
❑
1) The on/off switch can be mounted on either the outside of
the fuselage, using the switch mounting hardware that came with
your system or it can be mounted internally. If the switch is to be
mounted on the side of the fuselage, a rectangular hole must be
cut through the fuselage side to allow the switch lever to fit. The
best place to mount a switch is to place it in a convenient location,
protected from engine exhaust.
We have always preferred internally mounted switches for several
reasons; the installation tends to be visually neat and the switch
itself is protected from exhaust, dirt, and debris. In this design, an
internally mounted switch is easy to do. We first made a simple
switch mount using scrap 1/16" plywood. We drilled the switch
lever to accept a piece of .046 music wire. The wire extends out
of the fuselage side with a simple "L" bend.
The mount is
positioned on the floor of the fuselage, behind the main landing
gear mounting block. However you mount your switch, make sure
it is firmly in place with no pressure on the wiring leads.
❑
2) The receiver is now placed in the fuselage. Connect the
servo leads to the appropriate channels in the receiver, including
the aileron "Y" harness and the switch connector. Test the radio
system first, making sure everything works.
The receiver is
wrapped in protective foam, held in place with tape or rubber
bands. The two aileron cable ends of the "Y" harness should be
both free and accessible from the top of the cabin. We placed our
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