Owner manual

7
3/32" BALSA WEDGE
TRAILING EDGE STOCK
NOTE: The Bird of Time uses a “Phillip’s Entry
Airfoil.” This requires the bottom leading edge
sheeting to be pulled up onto the ribs when they are
glued to the sheeting. To do this easily, take some
3/32" balsa from your scrap box and cut a piece
about 6" long and 1/2" wide. Sand one end to a
narrow taper over the last inch. With the spar held
securely to the building board, slide this under the
leading edge sheeting. Then wedge the narrow edge
of a piece of trailing edge under the front edge of
the sheeting. This will hold the sheeting in close
contact with the rib. Use thin CA to glue the rib to
the sheeting.
❏ ❏ 10. Glue the root rib AA to the leading edge
sheeting with CA using the above technique to get
the “Phillip’s Entry Airfoil.” Double check the
alignment of the rib as you do this.
❏ ❏ 11. Starting from the inboard end, install the
2nd, 3rd, 4th and 5th “A” ribs, gluing them to the
spar and leading edge sheeting as above. Check the
spacing with the 3/8" x 9/16" x 2-7/8" vertical
grain shear webs prior to gluing the ribs. Pin the
rear of the ribs securely to the building board. Do
not install the first “A” rib or the one at the
polyhedral joint.
1/4" I.D. FIBERGLASS
ARROW SHAFT
TAPER END WITH SANDPAPER
FILLER BLOCK
❏ ❏ 12. Taper the outboard end of the 1/4" I.D.
fiberglass arrow shaft for about 1-1/4" as shown in
section W-W. This will permit the proper angle of
dihedral. Roughen the outside of this tube with
sandpaper. From a piece of 3/8" x 3/8" x 18"
balsa, make the filler blocks that support the
fiberglass tube. Do not glue the blocks at this time.
Make sure the top filler block does not intrude into
the top spar area. You can use the sharpened 1/4"
I.D. brass tube to cut channels in the filler blocks.
❏ ❏ 13. Saw the main-spar polyhedral braces from
the 1/8" plywood and sand them to the correct
dimensions. Using 6-minute epoxy, glue the polyhedral
brace in place on the inner wing panel. (These pieces
are not cut from lite plywood. Rather than cut them fully
and end up with ragged edges we felt it better for you
to do the final cutting.)
CUT OUT THIS SECTION
❏ ❏ 14. Check the fit of the 3/8" x 9/16" x 2-7/8"
vertical grain shear webs making sure they don’t
protrude into the top spar area. Glue them into place
with 6-minute epoxy. Cut a section out of one of the