Old School Model Works RAVEN Construction Manual page 7

necessary to hold it flat along the entire length of the joint. When
cured, remove the tape and you'll now have a single, wider piece
of sheeting.
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Step 29 - Wing (top sheeting, part 4)
Glue the leading sheeting up
against the leading edge first
(medium CA works well for this).
Once cured, bend the sheeting
back over the wing and temporarily
tape it in place (or weigh it down).
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Step 30 - Wing (top sheeting, part 5)
Now apply a slower drying glue (aliphatic resin and/or carpenter's
glue) to the upper framework of the wing (tops of the ribs, upper
spar, trailing edge, etc.). Note that a paint or epoxy brush works
great for this.
Then work your way
rearwards, gluing a little at
a time. Press the sheeting
firmly against the ribs and
weigh it down before gluing
the next section of sheeting
- slowly working your way
back to the trailing edge,
being careful not to put a
bend (warp) in the wing.
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Step 31 - Wing (remove tabs)
Once the glue has cured from the previous step, it is now time to
remove the wing panel from the building surface. Flip the wing
over and carefully remove all the underside tabs that helped
hold the ribs in place. There's one on the back of each rib. When
trimming these tabs, make sure you cut them away just enough so
that the airfoil shape of each rib is not interrupted.
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Step 32 - Wing (HS)
Locate three HSs from BP5. Just
like you did on the top of the wing,
now you'll glue these pieces in
three spots on TE - between R2 &
R3, between R4 & R5, and between
R6 & R7.
Once they're glued in place, you'll
need to CAREFULLY sand them so their profiles match the profile
of the ribs.
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Step 33 - Wing (hatch rails)
Locate the left-over 3/16" x 3/8"
basswood strip used in the spars.
Cut two 2-5/16" lengths.
Also cut one similarly sized piece of
1/16" from the scrap area of BP9,
BP10, or BP11.
One basswood rail is glued to the
outside of R3, and the inside of R4,
using the following method.
Place a few drops of glue to the
3/16" (thinner) side of one of the
Construction Manual
basswood rails. Place the 1/16" piece you cut on top of the rail,
then press the rail in position - up against the lower spar, and
making sure that the 1/16" piece is flush with the edge of rib. Be
sure NOT to glue the 1/16" piece in place as it's just a spacer.
When finished, you'll have two rails in place, set just below the
surface of the ribs - 1/16" below.
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Step 34 - Wing (servo hatch frame)
Locate left-over 5/16" sq. balsa
strip, cut when creating the leading
edge. Measure and cut a length to
go between R3 and R4 as shown
here. Make sure it is a snug fit and
glue it in place, up against the
hatch rails, you just installed, but
flush with the bottom surface of the ribs.
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Step 35 - Wing (underside sheeting, part 1)
Using the same techniques use when creating and installing the
upper sheeting, it's now time to install the underside sheeting.
Locate one of the uncut sheets of 1/16" balsa, and the leftover
1/16" piece you cut when making the top sheeting.
Glue these together in the same way as before, then glue them to
the leading edge.
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Step 36 - Wing (underside sheeting, part 2)
Once cured, bend the sheeting
back over
temporarily tape it in place (or
weigh it down). Again, using the
same techniques you used on
the top side, apply some slower
curing glue to the frame - the rib's
surfaces, lower spar and the balsa hatch-frame (not the rails). Then
slowly attach the sheeting. Weigh it down and allow it to cure fully.
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Step 37 - Wing (shaped trailing edge)
Locate one of the 5/16" x 1-1/4" x 36" tapered balsa strips.
This is cut to make the final
trailing edge, as well as the
aileron. These cuts are noted
on the plans and need to
be angled, so double-check
everything before cutting.
Also, make sure that you are
orienting the tapered balsa
the correct way. Check the diagram below.
When you have the cuts made, glue the two shorter pieces in place
as shown in the photo. Set the aileron aside.
You can wick in some thin C/A into these short trailing edge pieces
to help strengthen them if you'd like.
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Step 38 - Wing (sanding)
Take a few moments to sand the wing panel smooth. Make sure
to also sand the trailing edge, as well as the root (R1) and tip (R9)
edges flat.
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the wing and
flat edge on bottom, tapered side on the top.
Page 7