Dynaflite Bird of Time Instruction Manual page 8

"A" ribs between the top and bottom spar cutouts and
glue this to the end of the innermost shear web. Make
sure the webs are aligned with the spars in the two
bays with plywood shear webs.
❏ ❏
15. Fit the four plywood shear webs to the
inboard panel. Sand the inner "AA" rib to fit as
needed. Do not glue at this time. Cut and fit two
balsa shear webs from leftover 1/16" sheeting for
the tube areas not covered by the ply shear webs.
These will act as dams to prevent epoxy from
running out of the wing tube cavity in the next step.
NOTE: In the next step you will use epoxy to glue
several parts in the inner wing tube area. Use
30-minute epoxy for this as 6-minute epoxy cures to
rapidly. You will need several clamps; spring type
clothespins work well.
1/16" PLY SHEAR WEBS
3/8" BALSA SHEAR WEBS
❏ ❏
16. Mix approximately 1/2 ounce of
30-minute epoxy in a mixing cup. Using a liberal
quantity of epoxy, install the filler blocks and tube
from step 12. Next, glue the four 1/16" plywood
shear webs and two 1/16" leftover balsa shear webs
to the lower spar, 3/8" balsa shear webs and tube
assembly with epoxy. Finally, epoxy the top
hardwood spar to the polyhedral brace, "A" ribs,
3/8" balsa shear webs, tube assembly and inner
"AA" rib. Clamp the parts together and check the
alignment of the parts before the epoxy sets up. Insert
the 1/4" metal rod into the tube and check that it is at
a 90° angle with the side of the inner "AA" rib.
While the epoxy cures, it's a good time for a cup of
coffee. The rest of the wing goes quickly after all the
glue has cured.
❏ ❏
"A" rib to fit and install with CA. Pin the rear of the
ribs securely to the building board. Do not install the
"A" rib at the polyhedral joint yet.
❏ ❏
and glue to the spars and leading edge sheeting
with CA as before. Pin the rear of the ribs securely to
the building board.
❏ ❏
polyhedral joint from the piece of 1/4" x 1-1/8"
balsa. Glue all three trailing edge pieces to the ribs
with CA. Do not glue the inner and outer panels to
each other.
❏ ❏
outboard spar to fit the die-cut wing tip. Laminate
90°
three wing tip pieces together with thick CA. When
dry, glue the wing tip and tip gusset in place with CA.
Note there is no rib at the tip. The tip block will be
carved and sanded to the section shown on the plan.
1/4" METAL
❏ ❏
ROD
four shear webs and install them in the outboard
panel as shown. If you plan to land on the wing tips
very often you may want to add shear webs all the
way to the tips; but remember, on a 10' airplane, the
lighter the tips the better the response.
❏ ❏
around each rib on the lower sheeting.
❏ ❏
worktable and sand the trailing edge joint to the
proper angle. Insure the polyhedral brace fits
properly at rib "B" and between the spars. Block the
wing tip to the height shown on the plan. Using
6-minute epoxy, glue the polyhedral brace to the
outer spar. Do not glue the top spar in position yet.
Glue the trailing edges together with epoxy.
8
17. Cut the remaining four "AA" ribs and one
18. Install the outboard ribs "B" through "K"
19. Cut the short trailing edge piece at the
20. Trim the outboard lower sheeting and the
21. Using leftover 1/16" balsa sheet, trim
22. Using thin CA, apply a liberal fillet
23. Remove the outer panel from the