Great Planes Fun One 40 - GPMA0490 - Manual (Page 29)

MOUNT STABILIZER AND FIN
D 1. Lightly sand the stab saddle area smooth with a
T-bar or sanding block. Be careful not to sand an angle
onto the stab bed.
will need to cut away the turtle deck top to allow the fin to
sit flat on the stab. Now cut through the turtle deck top
1/8" on both sides of this line and trial fit the fin on the stab.
The fin trailing edge must line up with the aft end of the
fuselage. If the dorsal fin keeps the fin from silting flat on
the stab, cut it off and glue it back on later.
D 2. Accurately measure the trailing edge of the stabi-
lizer and mark the center point.
D 3. Temporarily mount the wing on the fuse (for
reference).
D 8. 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 with epoxy.
D 4. Lay the stab in position on the slab saddle with the
stab centerline lined up with the fuse centerline. The TE
of the stab should be even with the back of the fuselage
with the center mark on the TE positioned over the joint
between the two fuse sides.
D 5. Use a string and a T-pin like you did on the wing
but stick the pin at the front middle of the turtle deck to help
align the slab. With the slab in alignment, make a mark on
the front of the stab and a corresponding mark on the back
of the turtle deck top, which will be used for rapid align-
ment when gluing.
D 9. Re-glue (if necessary) the 1/4" balsa dorsal fin in
place on the aft deck. The dorsal fin, like the fin, must also
line up with the fuselage centerline. Blend it to the fin with
balsa filler.
D 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 pin in proper alignment until the glue has firmly
set. Wipe off any excess epoxy before it sets up.
D 7. Draw a line on the turtle deck approximately 1"
long starting at the rear center of the turtle deck top.
Position the fin in place on the stab and mark where you
D 10. Cut two pieces of 1/4" triangle and sand them as
shown on the plan and in the photo to make the Fin fillets.
Securely glue the fillets in place on both sides of the fin.
Use a lightweight balsa filler to blend these in with the
turtle deck and sand them smooth.
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