Extreme Flight 78" EXTRA 300 ARF Instruction Manual page 22

23. For mounting a gas engine, contact the engine manufacturer for a mounting template,
print it and tape into position on the front of the firewall, being careful to align the
vertical positioning mark with the laser scribed vertical line to the right of the center line
and the horizontal positioning mark with the laser scribed horizontal line on the firewall.
Drill the proper size hole at each location and mount the engine with the bolts
recommended by the manufacturer. Distance from the face of the firewall to the thrust
washer for the gas version of the Extra is 6.25 inches. It may be necessary to use standoffs
to achieve this measurement.
23. Install your rudder servo using the supplied hardware with the output shaft toward
the rear of the plane. We used the older Hitec 5945 and Hitec 5985 in our prototypes with
great results (this servo has recently been updated and re-released as the Hitec 7985).
We are using the SWB 3.5" offset rudder arm. We highly recommend the use of this
quality product to ensure correct geometry.
24. Next let's install the pull-pull rudder cables. Look into the rear of the fuselage and you
will see a nylon tube installed on each side of the fuselage. Use a pieces of wire or T-pin to
open the holes for the pull-pull cables on each side of the fuselage.
25. Assemble one end of the linkage by inserting the pull-pull cable into one of the
aluminum tubes, through the hole in the brass pull-pull fitting and back
through the crimp. Loop the cable back through the crimp a
second time and crimp with side cutters.
Insert the bare end of the cable into the slot in the rear of the fuselage and feed it forward
into the canopy area and make up the same type of linkage as you did previously.
Electronically center your servo. Secure the linkage at both ends with a 3mm bolt and
nylon insert lock nut. Repeat for the other side.
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