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10. Install the aileron bay trailing edge (ABTE). A small amount of extra
material has been provided to allow sanding the ends to parallel W7
and W12 for a flush fit. The end marked “R” is the root end. Use a
piece of 1/8” music wire through the hinge holes to align the hinge
blocks (HB) and glue them at this time. First tack glue them, then
remove the piano wire pin and the then complete gluing them with
thin CA.
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11. Here comes the “G” word. At this point you have the entire
superstructure of the wing dry fit assembled with a few minor
exceptions. Get your glue out. One note here, when building like this
it is easy to loose track of what has been glued and what has not. Best
to be systematic about it. Start with the rib leading edges, at each step
along the way check the assembly for square. Before beginning place
some weight on the aft portion of the wing rib to be sure they are in
contact with the building board. Yet another note, when gluing the
sheer webs, make sure that they are perfectly flush top and bottom.
Use some scrap 3/32” balsa to shim them up at every other bay. Once
flush, apply thin CA into the glue ports cut into SW-T. Hold the two
sheer webs in close contact and apply just enough CA to tack them at
this time.
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12. You are now ready to install the top spar flange. Note that the spar flange has a top and a bottom. Be sure
to install it so that the root end aligns with W1, if it doesn’t align, flip it over. Use aliphatic resin or slow
CA to glue this. Keep the weight on the aft rib sections to assure the ribs are seated on the building board.
Apply glue to the entire length of the spar web and to each rib flange notch. After installing, weight it with
a straight edge until cured.
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9. Install the 1/16” ply wing trailing edge. It must tip into the slot in W7
and then slide forward into the slots at the trailing edges of ribs W2,
W3, W4, W5 and W6. Tabs will engage it into rib W1.
The 1/16” ply trailing edge keys into all
wing ribs. It must tip into rib W-7, then
slide forward into remaining ribs.
Aileron bay trailing edge (ABTE) keys
into all wing ribs. Note that in this
photo the aileron servo mount rails have
already been installed. You will get to
those later.
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13. When the glue has cured, remove the weights and pins and remove the assembly from the building board.
DO NOT remove the pinning tabs and stand off’s at this time. Lay the assembly upside down and install
the bottom spar flange in the same manner as you did the top one. Leave the leading and trailing edges
float above the plan.
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14. The next step is to apply the top wing sheeting. Before that can be done however we need to plane the false
leading edge to contour with the wing ribs. Plane the aileron bay trailing edge to contour as well. Also sand
the trailing edge ply and wing tip ply somewhat to contour to increase glue land along these edges. Each
wing skin will require four 4” x 36” sheets of 1/16” balsa. Prepare four 1/16” x 15” x 36” wing skins.
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15. Place the assembly back on the building board topside up and pin the pin tabs to the board. Trim one of the
wing skins to about 1/2” oversize. You may have a preferred method but I will tell you what I did and you
can decide. Using aliphatic resin glue, apply a liberal bead of glue to all ribs and on the top spar flange,
leave the last two inches of the top spar flange at the root end without glue. This area will be glued later as
part of the spar joiner. Leave the leading edge and trailing edges dry. Place the wing skin over the assembly
and weigh it down with sand bags, shot bags, magazines or what ever you use to assure that the skin is kept
in contact with all ribs until the glue has set. This will take about 20 minutes. After the aliphatic resin has
set, remove the assembly from the building board, snap off all the stand off’s and pinning tabs. Temporarily
force the top sheeting into contact with the ply wing tip and mark the edge with a pencil line.
