7
Stuff double thickness of wing rib scrap into rib slots as
shown in sketch to center spars in their respective slots.
Glue spar bottoms to spacers.
Glue spar brace firmly to spar. Let dry thoroughly.
5.
Using a square-cornered sanding block, lightly sand L.E.
and T.E. to match with spar angles.
6.
Pin RIGHT
OUTBOARD
L.E. and T.E. in place over
plan.
Position and glue ribs 10 through 18. Add gusset at corner
of rib 18 and T.E.
Sand one end of spars for proper polyhedral angle shown
on plan.
Slide spars in place (angled ends at rib 9 position), but
do not yet glue.
Lightly sand L.E. and T.E. to conform to spar polyhedral
angles.
Proceed directly to Step 8.
NOTE: Some people have wondered why we show an optional 3-piece
wing. The reason is that, in a 2-piece wing, the structural requirements
at the center are very high. This leads to a more difficult structure, and
a heavier one. Having removable outboard panels is much simpler and
lighter.
NOTE:IF YOU ARE MAKING THE WING WITH THE
REMOVABLE TIP OPTION, OMIT THE NEXT 3 BOXES AND
PROCEED DIRECTLY TO STEP 7.
IMPORTANT
THIS STEP IS FOR THE REMOVABLE TIP OPTION ONLY!
7.
Cut four new #9 ribs from 1/8” hard balsa, using rib
pattern at upper right corner of plan labeled
“REMOVABLE TIP
OPTION.”
Do not use die-cut rib #9.
Use SANDING ANGLE TEMPLATE (cut or copy
from
right corner of plan) and 1/8” ply scrap to establish
proper sanding block angle, as shown in sketch.
Slide outboard spars in place, but
do not glue yet.
Gently sand polyhedral ends of spars, L.E.’s and T.E.’s
for uniform vertical surfaces.
Scrap material for spacing-Do not glue
