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Construction Manual
Step 4 - Wing Assembly (R3, R4 and R5 ribs)
This step will require one R3
rib (from BP7), two R4 ribs
(from BP10) and five R5 ribs
(also from BP10).
Starting from the root (right
side), carefully insert each
rib into place as shown,
making sure they are
completely inserted into
the corresponding slot on
J1, completely seated on the spar, and the tab on the back of each
rib is touching the plans. Working from the root, insert R3 first, then
both R4’s, then the five R5 ribs.
Don’t glue the ribs in place just yet.
Step 5 - Wing Assembly (attach J2)
Locate one of the J2 jigs from BP11. As this is cut from 1/16th
balsa, take care not to break
it. On one end you’ll see a
small engraved circle. This
notes the end that will be
located towards the wing’s
root (R1).
Carefully slide J2 into place,
into the cutouts on the rear each rib as
shown here. When properly positioned,
it will lock each of the ribs in place with
the proper spacing.
This J2 piece is quite fragile until is it
glued in place. Be very careful not to
use too much force when placing it position in each of the ribs.
When J2 is in place, make sure all of the ribs are properly aligned
with the plans as shown, all the parts are firmly seated, then glue
each rib to J1, J2 and the lower spar.
Step 6 - Wing Assembly (trailing edge)
Measure and cut the trailing edge
from a piece of 1/4” x 1/2” balsa
strip.
When properly positioned, the 1/4”
side will rest on the “ledge” cut into
each rib’s rear tabs. The 1/2” side
will touch along the entire length
of J2. Test fit, then when satisfied,
glue this piece to J2 and the ribs
as shown. No need to glue it to the
tab ledges.
Step 7 - Wing Assembly (WH6)
Locate one WH6 from LP3. Note the
engraved circle. When properly inserted
into R3, this circle should face R2 and be
at the top as shown here.
Make sure it is perpendicular to R3, then
glue in position.
Step 8 - Wing Assembly (WH4 and WH5)
Locate one WH4 and one WH5
from LP1. First, position WH4 into
R3 with it’s engraved circle facing
R2 towards the leading edge of
the wing as shown. Glue this in
position, then glue WH5 on top of
WH4, aligned as shown.
Step 9 - Wing Assembly (attach R2)
Locate one R2 from LP4. It is slid into
place with the tabs from WH4 and WH6
fully inserted into the slots precut into
R2. Also, because of the angle already
cut into WH4 and J1, when R2 is flush
with these parts, it will have a slight
angle to allow for the wing’s dihedral.
It’s crucial that this part be glued in
correctly and that it is glued with no
warps or twists.
Step 10 - Wing Assembly (leading edge)
Locate one of the 5/16" square
balsa strips. Measure and cut
this to length to form the wing’s
leading edge.
Glue in place, making sure the
strip is fully seated to each rib.
Also make sure that all the ribs
are straight, with no twists or
bends before, or after gluing.
Step 11 - Wing Assembly (upper spar)
Using a length of 3/16 x 3/8” basswood, measure and cut it to form
the upper spar. Note that it runs from R2 to the last R5 at the wing’s
tip - it does not extend into R1.
Glue this in position, making sure it is securely attached to all of
the ribs and to J1.
Step 12 - Wing Assembly (R3a)
Locate one R3a from BP6. This
is glued to the outer surface of
the R3 rib you glued in place
previously.
Note that the J2 has an angled
notch to help position it in place
as shown.
Glue this in position.
Step 13 - Wing Assembly (R6 and R7)
Locate six R6’s and one R7 from BP12.
These are sub-ribs used to add torsional
rigidity to the wing. Each one is placed
in at an angle and because of that
angle, the edges that touch the ribs will
need a slight bevel sanded into them.
Because the pieces alternate as they’re installed, only work with 1
piece at a time so you don’t accidentally bevel the wrong edge.
