Owner manual

BUILD THE WING
NOTE: It is easier to build the inboard and outboard
panels at one time, although it is not important to do
so. Just don’t glue them together as they must be
separated to prepare them for the polyhedral joint.
❏ ❏ 1. Cut the Leading Edge Shaping Template
and Inboard Dihedral Gauge from the plan. Cover
the left wing plan with wax paper to prevent the
structure from being glued to the plan.
❏ ❏ 2. Trim a piece of 1/16" x 4" x 36" balsa
sheet to 24". Save the cutoff piece for use later. Trim
this 24" piece to a width of 3-9/16". Pin this
leading edge sheeting over the inboard panel plan
with the aft edge of the sheeting flush with the aft
edge of the spar line.
❏ ❏ 3. Shape the center wing sheeting using the
piece cutoff in the previous step. There is an extra
piece of 1/16" x 3" x 36" sheeting provided for this
sheeting as well. Pin it to the board and glue the
seams with thin CA adhesive.
Trim this piece from the
1/16"x3"x36" sheet.
Glue cut-off piece in position
Trim end as shown
❏ ❏ 4. The outer panel leading edge sheeting is
made from a 1/16" x 3" x 36" balsa sheet. Lay the
sheet over the plan and trim to the proper shape. CA
the triangular piece that you cut off to the inboard
end of the sheet to bring it to the required width.
Trim this sheet to the proper length and pin it to the
plan with the aft edge of the sheeting flush with the
aft edge of the spar line.
❏ ❏ 5. Using aliphatic resin, glue the 1/8" x 3/8"
x 24" hardwood inboard spar to the inboard lower
sheeting, flush with the rear edge. Similarly, glue the
1/8" x 3/8" x 36" balsa outboard spar to the
outboard lower sheeting. Be careful not to glue the
outer panel to the inner panel.
❏ ❏ 6. Remove the ribs from the die-cut sheets,
marking each rib with its identification as it is
removed. Lightly sand the back of the sheet, if
needed, for clean removal. Lightly sand each part to
remove any fuzz or die-cutting irregularities, taking
care not to alter the contour of the part in the
process. Check each rib to insure the spar notches
are clean and fit the spar.
❏ ❏ 7. Note the difference between the A and AA
ribs (the aft end of the AA rib is narrower). Stack the
A ribs together and lightly sand them so that they
are all of the same width and contour, being careful
not to alter the airfoil’s shape. Do the same for the
AA ribs.
❏ ❏ 8. Study section W-W for the installation of
the wing joiner tube. Sharpen the end of a 1/4" I.D.
brass tube (or use a drill) to make a hole at the
proper location in one of the AA ribs. The hole
should be located so that the tube will just touch the
top spar.
❏ ❏ 9. Glue the Inboard Dihedral Gauge to a
piece of leftover balsa or ply, then cut and sand it to
the proper shape. Put the root AA rib (from step 8)
in place on the spar and use the Inboard Dihedral
Gauge to insure it is at the proper angle as shown in
detail W-W (3.5 degrees). Glue the rib to the spar
and center sheeting with CA being careful that the
rib is properly aligned with the dihedral gauge and
inboard edge of the wing. This alignment is
important as even a small error will produce a
large shift on a ten foot wing. Pin the rear of the rib
securely to the building board. Do not glue the rib to
the leading edge sheeting at this time.
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