Great Planes Extra 300S 1.60 ARF - GPMA1365 - Manual (Page 14)

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10. A 2-56 clevis will be used to attach the tail wheel
steering arm to the rudder servo but the steering arm is
slightly too thick for the clevis. Sand off 1/32" [.8mm] from
the face of the steering arm, allowing a 2-56 clevis to fit
easily over the arm.
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11. Examine the photograph to help in making the tail
wheel steering control arm. Remove the clevis from the
rudder control arm. Then remove the 4-40 threaded clevis
and 4-40 nut from the pushrod wire. Slide a #4 washer onto
the rudder pushrod followed by a 1" piece of silicone fuel
tubing, the nylon steering horn, another piece of 1" silicone
fuel tubing and another #4 washer. Reinstall the 4-40 nut
onto the pushrod followed by the 4-40 aluminum clevis.
Adjust the rudder clevis and then tighten the 4-40 nut
against the clevis.
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12. Install a 2-56 nut completely onto the threaded end of the
.074 x 6" [1.9 x 152mm] wire. Cut 1/2" [13mm] off of the
threaded end of the wire. Unscrew the nut from the threads;
this will clean up the threads allowing the 2-56 clevis to easily
thread onto the wire. Re-install the nut followed by a 2-56
aluminum threaded clevis. Bend the wire as shown in the
photograph in step #11. Install the wire and clevis to the tail
wheel steering arm. Install a 2-56 solder clevis onto the nylon
steering horn. Center the tail wheel with the rudder. Cut the
non-threaded end of the wire to length to fit into the solder
clevis. Remove the wire and clevises from the model. Solder
the 2-56 solder clevis to the end of the wire using the same
technique used on the pushrod wires. Install the wire to the tail
wheel and the nylon steering horn. Minor adjustments to the
steering arm can be made at the threaded clevis. Once
adjusted properly, tighten the nut against the clevis.
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1. Using a fine tip marker, extend the reference lines on
the firewall. Tape the engine mounting pattern located on
page 27 to the firewall. Align the reference lines on the
pattern with the lines on the firewall. Drill through the firewall
on the reference holes with a 3/16" [4.8mm] bit.
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2. Install the engine mount onto the firewall with four #8 x
1-1/4" [32mm] socket head cap screws, #8 flat washers and #8
lock washers. When installing the mount be sure you orient it as
shown so that the engine can be mounted on its side.
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3. Mark the location of the engine mount holes on the
mount. Drill a 9/64" [4mm] hole through each of these
marks. Run an 8/32 tap through each hole. Mount the
engine to the mount with four #8 x 1" [25mm] socket head
cap screws, #8 flat washers and #8 lock washers. Mount the
engine so that the distance from the front of the firewall to
the front of the engine thrust washer is 6-1/4" [159mm].
Install the Engine, Fuel Tank
& Throttle Servo
14