Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 34)

MOUNT STABILIZER AND FIN
1. Lightly sand the stab saddle area smooth with
a T-bar or sanding block.
2. Find the 1/4" x 9/16" x 1-1/4" balsa stab filler
block and glue it to the stab saddle and the back of F-6A.
Sand off the ends flush with the fuse sides.
8. Trial fit the fin on the stab. The fin trailing edge
must line up with the aft end of the fuselage. If the fin
protrudes too far aft, sand a small amount off the front of
the fin.
9. Carefully align the fin on the stab. The fin must
be positioned perpendicular to the stab and must line
up with the fuselage centerline EXACTLY! Securely
glue the fin in place.
stabilizer and mark the center point.
4. Temporarily mount the wing in the saddle (for
reference), and block up the tips until the wing is level.
5. Lay the stab in position on the stab saddle with
the center point lined up with the tail end of the fuselage.
If the stab protrudes beyond the end of the fuselage, sand
a little off the front of the stab until it fits. Carefully
check the stab alignment by measuring down from the
tips to a flat surface, and from the stab tips to the wing tips
(or to a point on the center of the fuse near the nose). Sand
the stab saddle (a little at a time! ) until the stab rests in
proper alignment. With the stab in alignment, make a
mark on the front of the stab and a corresponding mark
on the back of F-6A, which will be used for rapid
alignment when gluing.
3. Accurately measure the trailing edge of the
10. Now securely glue the fin fillets (you previously
shaped these) in place on both sides of the fin.
11. Temporarily attach the elevators and rudder to
check their fit and operation. Note that you must cut a
notch in the rudder leading edge to clear the 1/8" wire
elevator joiner.
6. Mix up a batch of 5-minute or 30-minute epoxy
and apply it to the stab saddle. Press the stab into position
and hold or pin in proper alignment until the glue has
firmly set. Wipe off any excess epoxy before it sets up.
7. From the 3/8" balsa triangle supplied, cut and
securely glue fillets under the stab, at the stab/fuse joint.
(The photo for this step is at the top of the next column.)
12. Finally, glue the 1/4" balsa dorsal fin in place on
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the turtle deck. The dorsal fin, like the fin, must also line