Owner manual
❏ 7. Glue the die-cut 3/32” [2.4mm] balsa rudder
rib R1A into position. If necessary, sand R1A to
blend with the rest of the structure.
Now it’s time to make the balsa skins for sheeting the
fin and rudder.
❏ 8. Glue together both sets of die-cut 1/16"[1.6mm]
balsa parts that make up the fin skins. CA could be
used, but aliphatic resin (white glue) is preferred as it
allows time for positioning and is easier to sand. Use
masking tape and weights to hold the parts together
while the glue dries and press down along the glue
joint to make sure the seams are flat.
❏ 9. Cut the two corner pieces and the leading edge
pieces as shown on the plan from a 1/16"x 3"x 30"[1.6 x
75 x 760mm] balsa sheet to complete the skins and glue
them into position.
❏ 10. After the glue dries examine both skins to see
which side will be the right and which side will be the
left. Arrange the skins so the best sides will be on the
outside. Use 180-grit sandpaper to carefully sand
both sides of the skins flat. Note: The insides don’t
have to be as “flat” as the outsides—use care not to
over thin the skins by sanding too much.
❏ 11. Carefully cut out the corrugations. A single-
edge razor blade works well until you get to the
smaller ones near the top of the skin where a #11
blade will have to be used.
❏ 12. Make a thin sanding tool by using spray
adhesive to bond a piece of medium-grit sandpaper
to a strip of leftover 1/16"[1.6mm] plywood. Use the
sanding tool to true the edges of the corrugations.
Hold the skin down near the edges of the
corrugations with a ruler or something similar so you
do not damage the skin while sanding.
❏ 13. Cut the corrugation filler strips from 1/16"x
1/4"x 30"[1.6 x 6.4 x 760mm] balsa sticks and glue
them to the inside of the fin skins. The best way to
align the strips is with a straightedge—start at the top
and work your way down. Once a filler strip has been
positioned, use medium CA to glue it into position.
Using thin CA is not recommended because it may
not create a strong enough bond to hold the filler
strips to the skin when bending it to the ribs.
Note: Should you decide to build your Arrow
without the corrugations, replace the die-cut skins
supplied with this kit with soft to medium density
1/16"[1.6mm] balsa sheeting (not supplied).
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