ommended). Fit the stringers in the precut
notches in the ribs. Fix with glue. The
stringers are rather delicate, so be careful
handling the strips. Out at the wing tips the
stringers angle toward the wing tip strip as
seen in
Figure 1-7
.
You should be able to slide the lower strip
through the notches, or you could lay them
down before installing the ribs (an option
noted in Paragraph 3).
7. Adding Miscellaneous Stiffeners
and Lower Wing Walk
Install the 1/32" square stiffeners between
the ribs adjacent to the inboard edge of the
ailerons.
On the lower wings, fit the supports and
wood sheet over the two inboard ribs, which
provides a wing walk
(Figure 1-10)
.
8. Installing the Leading Edge Cover
Sheet
Install the plywood cover sheet (also ply-
wood veneer on the real aircraft) on top of
the wings only. It fits from the leading edge
strip back to the middle of the front beam
(Figure 1-11)
. Use some small clamps to
hold the cover sheet in position while the
glue dries, or glue the front first, then glue
the sheet to the front beam with super glue
plus accelerator for a quick fix. The wood is
not as long as the upper wing, so you must
have one butt joint. Place the butt joint at
one of the ribs.
9. Installing the Cap Strips
The upper cap strips can be installed while
the wings are still pinned to the building
board. The wings must be removed from the
board to install the lower strips. To hold the
cap strips in position for gluing, use a bent
pin, or super glue the cap strip at the leading
edge and use super glue plus accelerator at
the trailing edge. Then add glue to the
remaining areas. The cap strips butt into the
ply sheet on top of the wing and to the lead-
ing edge on the bottom.
After the wings are removed from the build-
ing board, add self-adhesive copper tape over
the trailing edge at each rib.
Figure 1-12
shows the cap strips and also the copper
tape. Remember this figure so you don’t
forget to add the tape later.
Another method for gluing cap strips is to
coat the rib and cap strip with white glue,
let dry, then use an iron to heat-bond the
cap strips on. Though I have no personal
experience with this method, I am told this
works fine.
Note:
The basswood cap strips at 0.020" thick
are a little thicker than the 1/64"-thick ply
sheet (1/64" basswood not available). Sand
the front of the cap strips flush with the top
of the ply sheet. Also, sand the cap strips at
the trailing edge down to the steel rod before
applying the self-adhesive copper tape. The
ribs are a little deeper at the trailing edge
than is found on the real aircraft.
FIG. 1-8 WING TRAILING EDGE
1/32"-DIA. STEEL ROD
TRAILING EDGE
(ON UPPER WING, ROD
IS ONLY ON AILERONS)
SPLICE WITH THREAD
LOWER
WING TIP
FIG. 1-9 LOWER WING HANDHOLD
BLOCK
LEADING EDGE
LASER-CUT BLOCK
W23 – SAND FLUSH
WITH TOP OF WING
AND ROUND
THE HOLE EDGES
FIG. 1-10 WING WALK – LOWER WINGS
1/64" PLYWOOD
W8
W9
3/64" X 3/64"
STIFFENERS
WING WALK
SUPPORTS
FIG. 1-11 LEADING EDGE COVER SHEET
CENTER OF BEAM FLANGE
LEADING EDGE SHEET
1/64" PLYWOOD
WING WALK PLY –
LOWER WING
10
CAP STRIP
LATER
(UPPER WING SIMILAR)
CAP STRIP LATER, OR WING WALK
FIG. 1-12 RIB CAP STRIPS
SAND CAP STRIP ENDS
DOWN TO TRAILING
EDGE ROD
ADD SELF-
ADHESIVE
COPPER TAPE
OVER ROD
AT TRAILING EDGE
BUTT INTO
COVER PLY
.020" X 1/16"
CAP STRIP
BUTT LOWER STRIP
INTO LEADING EDGE
COVER PLY
TOP ONLY
SAND CAP STRIP FLUSH
WITH COVER PLY
