£
3 Locate the top sheer web (SWT) and slide it down into the top slot of each rib. The top and bottom sheer
webs must be flush to each other at the top and bottom.
£
4 Tack glue the sheer webs to each other through the glue ports in SWT at each end and at the center. You
should now have all the full ribs captive in the sheer web assembly. W-1 will be installed later.
£
5 Use two pieces of scrap 1/16” balsa to shim up ribs W-1 and W-2. Place the trailing edges of each rib into
the appropriate slots in the trailing edge. Assure that the ribs are square to the trailing edge and then glue
them to the trailing edge. Note that there will be a gap on W-1 and W-6 where the dihedral braces will be
installed later.
With all parallel ribs captive in the sheer webs, the trail-
ing edges of the ribs are glued to the shaped trailing edge
in the appropriate notches. The leading edge notches will
engage the birds mouth at the front of each rib.
£
6 Locate the leading edge and slide it into position on the lead-
ing edge of the ribs, then glue it to the leading edge. Now
pin the leading edge to the building board to stabilize the
assembly.
£
7 Install all RA ribs and glue them to the leading edge and the
sheer web. Make sure they are flush top and bottom to the
sheer web.
The top spar flange is installed using a heavy straight
edge to assure good contact between the flange and the
sheer webs. The holes in the back of the top sheer web
will allow CA to be wicked into the sheer webs for ad-
ditional strength.
£
8 Use a slow setting adhesive such as Aliphatic Resin (Yel-
low Carpenters Glue) to glue on the top spar flange. Place a
weighted straight edge on top of it to assure that it is in good
contact with the top of the sheer webs and let it cure.
£
9 Install the for and aft center section sheeting. Trim for a snug
fit against the top spar flange.
£
10
Remove the assembly from the building board and flip it
over. Install the bottom spar flange in the same manor as you
did the top spar flange.
£
11 Install the bottom center section sheeting.
£
12 Use a sanding bar to sand both the root and tip rib sections
perfectly flat, then sand the leading edge to contour.
£
13 Apply a drop of thin CA into each of the glue ports in the
sheer web to cement the two sheer webs together.
£
14 Repeat steps 1 through 13 for the remaining inner panel.
OUTER WING PANEL ASSEMBLY
5
£
1 Laminate two W-12 wing tip sections together using the pin
register technique. Note that these parts are cut so that two
have the grain running in one direction and two have been ro-
tated so the grain will cross that of the other two. Select two
with opposing grain to form a cross grain part for strength.
Laminating two WT pieces together to form the wing tip
plate using the pin registration method.
