Great Planes Pitts Special 1/3 Scale ARF MonoKote - GPMA1218 User Manual

Page 19

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7. The photo above references the completed installation

of elevator and rudder servos, control horns, and pushrods.
Looking forward from the rear of the fuselage you can see
that the rudder servo is placed below the elevator servo.

8. To install the tail gear, position it so the forward edge

is 4-1/2" (115 mm) from the aft end of the fuselage as
shown in the above photo. Mark the location of the holes in
the tail gear on the fuselage and drill two 3/32" (2.4 mm)
holes. Be sure to again use the method of installing screws
into the model described on page 8 and install the gear with
two #4 x 1/2" (13 mm) Phillips head wood screws.

9. Grind or file a flat spot on the tail wheel wire where the

steering arm will be located. To locate its proper position
align the tail wheel with the rudder and mark the tail wheel

wire 90 degrees from the tail wheel. Assemble the tail gear
by placing one of the 1/8" (3mm) wheel collars and 4-40
setscrew onto the vertical wire portion of the gear. Then slip
it into the tail gear bracket. Attach the steering arm onto the
wire on the top side of the bracket as shown in the photo.
The steering arm must face the side of the fuse where the
rudder servo is located and be at 90 degrees to the tail
wheel. Install the tail wheel and the two 1/8" (3 mm) wheel
collars onto the gear. File flat spots on the gear wire and be
sure to use Threadlocker on all the wheel collar set screws
during the final assembly, to prevent them from loosening.

10. In order to make the ground steering as positive as

possible we are using a 2-56 pushrod extended from the
rudder control rod to the tail wheel steering arm. This is
shown in the above photograph. It is assembled by first
removing the rudder pushrod, metal clevis, clevis retainer
and hex nut from one end of the assembled pushrod.

11. Place a 3/32" wheel collar onto the rudder pushrod and

secure it into place with the set screw 1-1/4"(32mm) back from
the clevis where it enters the servo arm. On any high
performance model, always secure set screws with
Threadlocker. Cut two lengths of fuel line 1/2"(13mm) long. Slip
one piece of the fuel line onto the rod. Next slip the torque rod
control arm onto the rod as shown, followed by the remaining
piece of fuel line. Place another 3/32" wheel collar into place
behind the last piece of fuel line and secure it with the set
screw. Replace your hex nut and metal clevis and reattach the
assembly onto the rudder servo and control horn.

12. Place a nylon clevis onto the 2-56 x 12" (305mm)

threaded one end push rod approximately 25 turns and add
a silicone clevis retainer to it. Make a bend in the rod as
shown to align with the steering arm. Attach a 2-56 metal
solder clevis to the steering arm and hold it and the push rod
assembly in place while you align the tail wheel with the
rudder. Make a mark on the rod just as you did with the
rudder and elevator push rods. Cut the rod at that location
and solder the clevis into place. Attach the rod in place as
shown in the photos. This completes the tail wheel assembly.

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