Install The Tail Surfaces - GREAT PLANES Extra 300S ARF Instruction Manual

5. Use the paper strips over the cowl to find the location
of the hardwood blocks and drill at the center of the block,
through the cowl into the hardwood blocks with a 5/64"
[2mm] drill bit. Remember to drill all five cowl holes at the
same time without moving the cowl.
6. Remove the cowl and enlarge the holes in the cowl
with a 7/64" [2.8mm] drill bit. Use thin CA on the inside of the
cowl to strengthen the edges of the holes. Install a #4 x 5/8"
[16mm] screw into each one of the hardwood block holes.
Remove the screws and apply some thin CA into the holes
to strengthen the threads.
7. Install an extension on the needle valve. Use the same
technique you used before with the paper strips to mark the
location of the needle valve, muffler clearance holes, fill line
hole, glow starter, etc. on the cowl. After the holes are
marked on the cowl, remove the cowl from the airplane.
Note: If you are installing the cowl over a gas engine, you
will need to make holes for the slider kill switch, the gas fill
line, the carburetor choke, and the muffler.
8. Drill the needed holes on the cowl with a 5/64" [2mm]
drill bit and then enlarge them to the adequate size with a
High Speed Rotary Tool. Use thin CA to strengthen the cut
edges. Once all the holes are cut, reinstall the cowl with five
#4 x 5/8" [16mm] screws and five #4 washers.
The cowl installation is now complete.

Install the Tail Surfaces

Note: The Extra 300S ARF has a plug-in stabilizer. The
stabilizer is comprised of three built up parts, the stab
center-section, and the left and right stab panels. To
separate the outer panels you need to remove the four 4-40
x 3/4" [19mm] screws that secure the mounting tubes to
the outer panels at the bottom of the stab. Make sure you
tighten them before flying.
1. Find the plug-in stabilizer and insert it in the stabilizer
slot in the aft fuselage. Center the trailing edge by taking
accurate measurements as shown in "X"="X" in the photo.
Mark the location of the stab at the stab's trailing edge.
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