Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 10)

B. Flip the stab over and mark another line in the same location
as the first. If you see only one line, then it is on center. Proceed
and mark the hinge slots at each hinge location. If you see two
lines (as in the photo) you will have to adjust the height of the
stab until you can mark the centerline.
C. Use playing cards or business cards to adjust the height
of the stabilizer until you can mark the centerline. Mark the
hinge slots at each hinge location.
D. Use the same technique to mark the centerline along the
entire length of both elevators.
❏
3. Cut the hinge slots in the elevator and stabilizer using
a #11 blade. Begin by carefully cutting a very shallow slit at
the hinge location to accurately establish the hinge slot.
Make three or four more cuts going a little deeper each
time. As you cut, slide the knife from side to side until the
slot has reached the proper depth and width for the hinge.
❏
4. Cut the hinges for the elevators and rudder
from the supplied 2" x 9" hinge material, then
snip off the corners. Temporarily join the
elevators to the stab with the hinges adjusting
any hinge slots if necessary so they all align.
Do not glue in the hinges until you are
instructed to do so.
❏
5. Return to step 1 and use the same procedures to
hinge the rudder and fin.
❏
1. Refer to the Expert Tip that follows and shape the
leading edge of the elevators to a “V” as shown on the plans.
HOW TO BEVEL THE LEADING EDGES
A. Place the leading edge of one of the elevators on your
work surface and use your ballpoint pen to mark a “bevel
to” line on both sides about 3/32" high.
Note: You will probably have to adjust the height of the
elevator with card stock (as you did while marking the hinge
slots) so your “bevel to” line is not too high – making too
sharp of a “V.”
B. Using the bevel to lines and the center line as a guide,
make the “V” on the leading edge of the elevators with a
razor plane or your bar sander with 150-grit sandpaper.
Finish the Tail Surfaces
AND #11 BLADE
WITH HOBBY KNIFE
CUT HINGE SLOT
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