Charter
5
- The ribs F2 and F3 are different - don’t mix them up.
- Fit the spar web F11 and the rib F2 as shown on the plan.
Fig. 5
- Glue the spar web F11 and the rib F2 in place.
Fig. 6
- Glue the top wing spar F23 and the leading edge F22 to
the structure.
Fig. 7
- Cut the aileron spar doublers F24 to length and glue them
in place. Glue the aileron hinge spar F13 in the aileron
recess.
Fig. 8
- Pack up the bottom leading edge sheet panel F17 with
scrap strip wood so that it makes contact with the wing
ribs, as shown in Sections A-A and B-B. Clamp the shee-
ting to the leading edge using a spruce packing strip (n.i.)
and plenty of clothes pegs. The sheeting can now be
glued to the ribs and the leading edge. Check in particu-
lar that the sheeting makes good contact with the full
width of the leading edge. Allow the glue to set hard, then
cut off excess sheeting material where it projects beyond
the leading edge.
Fig. 9
- Bevel the bottom trailing edge sheet panel F14 to follow
the taper of the wing ribs, as shown in Section A-A; keep
the taper even over the full length of the wing panel.
Fig. 10
- Glue the top trailing edge sheeting F15 to the wing.
Fig. 11
- Note:
the aileron servo leads can be extended using eit-
her the ready-made servo extension leads F27 or home-
made leads made up using suitable three-core flexible
cable; in the latter case cut off part of the servo lead with
the connector, and solder the extension lead between the
servo and the removed cable end. The illustrations show
the home-made version.
- Prepare the aileron servo lead with plenty of excess
length, and thread it through the wing ribs F3 to F5. Coil
up the excess, and stow it temporarily in the bay between
the ribs F2 and F3. Tape the servo lead in place to prevent
it falling out.
Fig. 12
- Check once more that the wing panel is absolutely
straight and flat, and is making good contact with the
building board; sight along it from the end to look for
warps.
- The top leading edge sheeting F18 can now be glued to
the structure, as shown in Sections A-A and B-B. This is
the procedure: apply fast-setting white glue to all the joint
surfaces, lay the sheeting panel on top and clamp it to the
top main spar with clothes pegs. Press the sheeting panel
down against the ribs and onto the leading edge, and pin
it to the leading edge using plenty of modelling pins.
Fig. 13
- Allow the glued joints to harden fully, and only then remo-
ve the clothes pegs and the pins.
Fig. 14
- Cut the top centre section sheeting panels F16 to size,
trim them carefully to fit, and glue them over the bay bet-
ween the ribs F2 and F3.
Fig. 15
- Remove the wing panel from the building board, and fit
the bottom centre section sheeting F16 in the same way.
Fig. 16
- Glue the servo plate F12 in the wing as shown.
Fig. 17
- Sand the sheeting and the leading edge to the profiles
shown in Sections A-A and B-B. Take particular care to
maintain the correct airfoil at the leading edge.
- Sand back the excess sheeting and spar material where
it projects beyond the root rib and the tip rib.
Fig. 18
- Glue the wingtip block F10 to the tip rib, and round it off
as shown.
Fig. 19
- Cut the aileron F19 (taper-section balsa strip) to fit in the
recess in the wing, and sand it to fit snugly.
Fig. 20
- Draw a centreline along the front face of the aileron F19.
- Sand the leading edge to a double-sided bevel, symme-
trically about the marked centreline, as shown in Section
B-B.
Fig. 21
- Mark the position of the hinge slots F25 on the leading
edge of the aileron, working from the pre-cut slots in part
F13. Cut the slots in the aileron, and continue the pre-cut
slots in part F13 through the 8 x 8 mm balsa strip
doublers.
Fig. 22
- Attach the aileron temporarily using three flat hinges, and
check that it moves freely up and down.
- Don’t glue the hinges in place at this stage.
Figs. 23, 24
- Drill 2 mm Ø holes through the hinges and the doublers
as shown, and fit short lengths of 2 mm Ø beech dowel
(toothpicks) in the holes to prevent them pulling out.
- Assemble the second wing panel using exactly the same
procedure, but “handed” (mirror image).
Assembly and operating instructions
No.
3181
