Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 12)

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8. Temporarily join the elevators with the joiner wire. The
joiner wire will be easier to install if you chamfer (bevel) the
ends a little. If necessary, “tweak” the joiner wire so the
elevators are parallel and lay flat on your building table
when the joiner wire is installed. If you found it necessary to
“tweak” the joiner wire use a felt-tip pen to mark it so you
can install the joiner wire in the same orientation when you
permanently join the elevators.
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9. Use your bar sander and 150-grit sandpaper to round
the tail surfaces as shown on the fuse plan. Keep the ends
of the tail surfaces squared off just like the full size
Extra 300.
That's about it for the tail surfaces. They're a little more
work than sheet surfaces but they are much lighter, just
about as strong and add a nice piece of craftsmanship.
Clean off your work bench and get out the wing plan!
Start by building the right wing panel upside down over the
left wing panel plan so your progress matches the photos.
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1. Use one T-pin to pin the root end of a 5/16" x 5/16"
x 30" balsa main spar over its location on the plan so
approximately 1/2" extends past the wing centerline. This is
the top spar. Place a piece of 3/32" leftover balsa under
the tip of the spar past the location of rib R-10, then pin the
tip of the spar to the plan. Insert the T-pin at an angle so it
does not interfere with the bottom spar when it is added to
the assembly at step 5.
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2. Place the die-cut 3/32" balsa wing ribs R-2 through
R-10 on the top spar over their locations on the plan.
Note: The short jig tabs, the ones on every rib, should be
contacting the plan.
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3. Using small T-pins, pin the aft jig tab of ribs R-2
through R-10 to your building board over their location on
the plan.
Note: Insert the T-pins at an angle from the rear so they
can be removed after the trailing edge and bottom sheeting
are glued in position.
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4. Use small T-pins to pin the front jig tabs of ribs
R-2 through R-10 to the building board. You may insert the
pins into the front jig tabs any way you like because they will
be removed before the bottom leading sheeting is added.
Note: Due to the decreasing thickness in the wing towards
the tip, the top main spar is not pinned directly to the
building board. Instead, the ribs are securely pinned to the
building board. This is done so the ribs of both wing halves
will be vertical. You must follow the instructions closely on
where to insert the T-pins in the ribs so you do not conceal
them under the sheeting therefore making it difficult to
remove the wing from the building board.
Build the Wing Panels
BUILD THE WING
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