Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 33)

3. You may build the fillet on top of the fillet base
in one of the following ways:
Method 1: Glue pieces of soft balsa onto the fillet
bases, then sand to the fillet shape.
SHAPE THE FIN FILLETS
1. Using only one or two small drops of glue on
each piece, tack glue the following balsa parts together
(see sketch):
l/4"x7/8"x5-l/2".
DUMMY FIN
l/4"xl-l/4"x5-l/2"
DUMMY STAB l/2"xl3/16"x5-l/2
FIN FILLET
BLOCKS
SOFT BALSA FILLET
1/32" FILLET BASE
TOP OF WING
Method 2: Apply a good quality, lightweight
model filler, shape it with a wet teaspoon, and allow it to
dry thoroughly before sanding.
Method 3: A combination of the above, where you
first glue pieces of balsa to partially fill the fillet area,
then add filler to form the fillet shape.
2. Tack glue the above assembly to the stab saddle
with the "dummy fin" centered on the fuselage center-
line.
3. Carve and sand the above assembly to blend
FUSE SIDE
smoothly with the fuse sides and the turtle deck.
BALSA FILLER PIECES
FILLER MATERIAL
1/32" FILLET BASE
TOP OF WING
4. Break the assembly off the stab saddle and cut
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the parts apart. Save the shaped fin fillets for later.