GREAT PLANES Super Sportster 20, Instruction Book

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41. D ALIGN THE STABILIZER TO THE FUSELAGE
First align the fuselage to a flat work surface.
The fuselage reference line (the line along the top of the
fuselage side - see step 9 on page 12) should be parallel
to the work surface. Now align the stabilizer to the
fuselage in this manner: A - Draw a centerline down the
stab bed at the end of the fuselage. Line up the stab
centerline to the fuse centerline. B - Measure from each
stab tip to a point at the center of the top of the firewall
area. Each measurement should be the same. C -Measure
from each stab tip to the work surface. Each measure-
ment should be the same. D - To make sure you have 0
degrees incidence, measure from the center of the leading
edge to the work surface. Measure from the center of the
trailing edge to the work surface. These distances should
be the same. When the stabilizer is aligned, do not glue in
place but go on to the next step.
42. D PREPARE THE FIN FILLER BLOCKS; GLUE ON
THE STAB, FIN AND FIN FILLER BLOCKS
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 prepared fin filler blocks
in place with 5 minute epoxy. Remove excess epoxy.
43. D ADD DORSAL FIN AND FILLER PIECES (MAKE
FROM SCRAP)
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 side of the dorsal
fin. These filler pieces are used to anchor the covering
material later.
44. D ADD THE TAILWHEEL STRUT; FINISH RUDDER
For conventional gear, glue the tailwheel strut in
place as shown on the plans. Use 5 minute epoxy and
clamp the tail until the glue is dry. Add the last piece of
bottom sheeting. Mark and drill the hole for the tailwheel
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".
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