Great Planes Sportster Bipe 40 Kit - GPMA0510 - Manual (Page 20)

43. PREPARE THE FIN FILLER BLOCKS; GLUE ON
THE STAB, FIN AND FIN FILLER BLOCK
Prepare the fin filler blocks by cutting them to pick
up the angle of the top stringer. Then sand them to the contour
of the stringers. Shaping and sanding is easy if you tack glue
scraps of balsa the thickness of the stab and fin to the fuselage.
Trim the scrap even with the fuse sides and stringer line, then
tack glue the blocks in place and razor plane and sand them
to shape. When ready, break the blocks loose and remove and
discard the scrap. Use epoxy and glue the stabilizer to the
fuselage. Glue the fin to the stab at 90 degrees to the stab and
aligned on the stab centerline. Glue the fin to the stab at 90
degrees to the stab and aligned on the stab centerline. Glue
the prepared fin filler blocks in place with
5 minute epoxy. Re-
move excess epoxy.
44. ADD DORSAL FIN AND FILLER PIECES
Use scrap balsa and custom make the dorsal fin
piece and filler pieces. Glue the dorsal fin to the fin and 1/4"
top stringer. Glue the filler pieces between the top stringer and
the next stringer on each sdie of the dorsal fin. These filler
pieces are used to anchor the covering material later.
45. ADD TAIL WHEEL STRUT; FINISH RUDDER
Glue the tail wheel strut in place as shown on the
plans. Use 5 minute and clamp the tail until dry. Add the last
piece of bottom sheeting. Mark and drill the hole for the tail
wheel tiller arm in the rudder. Also groove the rudder leading
edge below the hole for the nylon bearing clearance. Shape
the leading edge of the rudder to a "V".
FINAL ASSEMBLY
1. ALIGN THE BOlTOM WING TO THE FUSELAGE
AND TOP WING
Align the fuselage upside down to the work surface
by placing the fuselage reference line parallel to the work sur-
face. Align the bottom wing to the fuselage by makingthe follow-
ing measurements: A-Center the wing side to side in the sad-
dle. The distance from the fuselage side to the wing tip on each
side should be the same. &The
wing tip to stab tip distance
should be the same on both sides. &Wing tip to work surface
and top wing tip to bottom wing tip distance should be the same
on both sides. D-The bottom wing has a positive incidence
of
+
1/32" to the top wing. This means that the leading edge of
the bottom wing should be 1/32" closer to the top wing than
the trailing edge of the bottom wing is. When the wing is in the
correct position, mark the fuselage and wing
so you can position
the wing exactly the same again.
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