Great Planes Extra 300S 40 ARF MonoKote - GPMA1240 - Manual (Page 13)

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17. Mount both wheel pants to the landing gear with a
drop of Great Planes Threadlocker or similar thread locking
compound and a 8-32 hex nut on both axles.
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18. If necessary, trim the opening in the wheel pants so
the wheels can roll freely. Add a drop of household oil to the
axles on both sides of the wheels.
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19. Mount the main landing gear to the fuselage with
two 8-32 x 3/4" SHCS.
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1. Cut fifteen 3/4" x 1" hinges from the CA hinge strip
supplied with this kit. Snip the corners off so they go into
the slots easier. You may cut all the hinges now, or cut
them as you need them.
Before you glue in the hinges, apply a few drops of
household oil to a tissue. Wipe the tissue over the trailing
edge of the fin and the leading edge of the rudder coating
them with a fine film of oil. This will prevent excess CA
you use for gluing in the hinges from sticking to the
rudder and fin at the hinge gap.
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2. Test fit the rudder to the fin and the tail gear wire with
the hinges. If the hinges are difficult to install or don’t go in
far enough, carefully enlarge the hinge slots with a hobby
knife and a #11 blade.
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3. Drill a 3/32" hole, 1/2" deep, in the center of the hinge
slot. If you use a Dremel ® MultiPro ™ for this task, it will
result in a cleaner hole than if you use a slower speed drill.
Drilling the hole will twist some of the wood fibers into the
slot, making it difficult to insert the hinge, so you should
reinsert the knife blade, working it back and forth a few
times to clean out the slot.
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4. If the hinges don’t remain centered, remove the
rudder and insert a pin in the center of the hinges.
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5. Pack the tail gear wire hole and the groove in the LE
of the rudder with epoxy. If you work quickly, you may use
5-minute epoxy, but we recommend 30-minute epoxy.
Rejoin the rudder to the fin using the hinges. Use a tissue
dampened with alcohol to wipe away excess epoxy before
it cures. Make sure there is approximately a 1/64" gap
between the rudder and the fin.
TEMPORARY PIN
TO KEEP HINGE
CENTERED
DRILL A 3/32" HOLE
1/2" DEEP, IN CENTER
OF HINGE SLOT
Rudder Assembly
1"
1"
3/4"
JOIN THE CONTROL SURFACES
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