Great Planes Extra 300S 60 Kit - GPMA0236 - Manual (Page 31)

❏
1. Fit the fin in place aligning it with a straightedge held
against the side of the fin and the edge of the “V-notch” cut
in the forward fuse top. Note: It is very important that the
fin be accurately aligned with the fuse centerline.
❏
2. Use your builder’s triangle to check that the fin is
perpendicular to the stab. Mark the stab on both sides of
the fin.
❏ 3. Using 30-minute epoxy, glue the fin in place. Double-
check that it is perpendicular and aligned with the centerline
of the fuse.
❏
1. Glue the die-cut 1/8" ply backrest (part #28) to the
fuse top, using the “backrest gauge” (G1) to set it at the
correct angle. Note: The gauge is used only for setting the
angle (do not glue the gauge in place).
❏
2. Use a square to position the die-cut 1/8" ply turtle
deck formers (part #’s 29 and 30) vertically, 90° to the
fuse top. Note: Part #29 glues to the front side of part #9,
not on top of it. Check the plan for positioning, and glue
these formers in place.
❏ 3. Cut two 13-1/2" long pieces from a 1/8" x 1/4" x 36"
balsa stick making two turtle deck top stringers. Round
the last 2" of each stringer as shown in the sketch so that
the turtle deck sheeting will be able to fit flush against
the fin.
❏ 4. Glue the stringers in place on the turtle deck formers
and the fin, with the rounded end glued to the fin.
❏
5. Sand the tops of the stringers to the shape of the
turtle deck formers.
Build the Turtle Deck
Mount the Fin
31