Owner manual
SHEET THE BOTTOM OF THE WING
❏ 1. Trim the jig tabs from the ribs on the bottom of
the wing. Sand the flap bay trailing edge, the aileron
bay sub trailing edge and the sub leading edges
even with the bottoms of the ribs.
❏ 2. If not building working flaps, cut out the
corrugations from a die-cut 1/16" [1.6mm] balsa flap
skin. Glue the flap skin to the wing, then glue on the
1/8" x 1/4" x 30" [3.2 x 6.4 x 760mm] balsa TE
support and the corrugation filler strips. Use the ribs
on the bottom of the wing as a guide to sand the TE
support and the top flap skin to accommodate the
bottom flap skin.
❏ 3. If building working flaps, cut three 1-1/2" [40mm]
flap hinge blocks from the 3/4" x 3/4" x 12" [19 x 19
x 300mm] balsa stick. Shape the hinge blocks to fit
the flap bay trailing edge, then glue them into
position where shown on the plan. Sand the hinge
blocks even with the bottom of the wing.
❏ 4. If building working flaps, trim the ribs and top
sheeting aft of the flap bay trailing edge as shown.
❏ 5. Assemble the three die-cut 1/8" [3.2mm] plywood
wing cradles by gluing the “feet” onto the supports.
❏ 6. Use thick or medium CA to tack glue the cradles
to the top wing sheeting directly over the respective
ribs—just a drop of CA in a few areas is all that is
required.
❏ 7. Use leftover 1/16" [1.6mm] sheeting and a
leftover 1/8" x 1/4" [3.2 x 6.4mm] balsa stick to sheet
the top of the wing and the TE support over the R9
ribs at the wing tip. Sand the sheeting and TE
support even with the bottom of the ribs.
❏ 8. Trim one of the aft wing skins to fit the bottom of
the wing. If building flaps, the skin should extend
slightly beyond the flap bay trailing edge for trimming
later. If building fixed flaps the skin should extend
only to the middle of the flap bay trailing edge. In
both cases, the front of the skin should align with the
middle of the bottom spar. Glue the skin into position,
but do not glue the skin to the flap or aileron hatch
rails or to the ribs between the rails.This will facilitate
the cutting of the sheeting for the hatch covers later.
Glue another piece of leftover 1/16" [1.6mm]
sheeting to the bottom of the wing over the R9 ribs.
❏ 9. If building fixed flaps glue the corrugations to
the inside of another flap skin, test fit, then glue the
skin into position.
❏ 10. Fit, then glue the forward wing skin into position.
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