Great Planes Extra 300S 60 Kit - GPMA0236 - Manual (Page 30)

❏ 4. Cut the 1/16" x 4" x 24" balsa sheet in half, making
two 12" long pieces. Edge glue them together.
❏
5. Use chalk to mark the top edge of the transition
stringers. Wet the outside of the sheeting then wrap it
around the stringers until you mark the sheeting with the
chalk. Trim the sheeting on the outside of the chalk lines.
❏
6. Fit the sheeting in place, removing a little wood at a
time until the sheeting cleanly butts up against the
transition stringers. Glue the sheeting in place.
❏ 7. Sand the transition stringers to the shape shown on
the cross-sections on the plans. Sand the sheeting flush
with the front and rear formers.
❏
1. If you have not already done so, make sure the stab
and fin are final sanded to a smooth finish as it will be a
little more difficult to do so after they are glued to the
fuselage.
❏
2. Mount the wing to the fuselage, then position the stab
on the fuselage. Stand about six to ten feet behind the
model and see if the stab is parallel with the wing. If necessary,
use your bar sander to make adjustments by sanding the
stab base until the stab is in alignment with the wing.
❏
3. Accurately measure the trailing edge of the stabilizer
and use a ballpoint pen to lightly mark the center. Use the
same procedure to mark the rear center of the stab base
where the trailing edge of the stab contacts it.
❏ 4. Place the stab on the stab base with the center marks
aligned, then use a large T-pin to pin only the trailing
edge of the stab to the stab base.
❏ 5. Stick a T-pin through the forward fuse deck sheeting
above the forward front deck former in the center of the
middle stringer, then use the “pin and string technique” to
accurately align the stab with the fuselage. Once the stab is
accurately aligned, pin the LE of the stab to the stab base.
❏
6. Carefully turn the fuselage over and use a ballpoint
pen to lightly mark where both fuselage sides contact the
bottom of the stab.
❏ 7. Remove the stab from the stab base but leave the
T-pins in the stab. Apply a film of 30-minute epoxy to the
stab base and to the stab between the lines you marked
indicating the fuselage sides.
❏
8. Reposition the stab on the stab base and reinsert the
T-pins into the same holes. Use the pin and string to
confirm the stab alignment, then use weights, more T-pins
or clamps to hold the stab in position. Wipe away excess
epoxy before it cures. Recheck the alignment, then do not
disturb the model until the epoxy cures.
❏
9. From the 3/16" x 3/16" x 18" balsa stick, fit, then glue
the stab fillets in place. Sand them flush with the fuse top.
Mount the Stabilizer to the Fuselage
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