GREAT PLANES Spectra Instructions Manual page 17

the Dihedral Braces and the Leading Edge Brace from the
die-cut sheets SPRTW04 and SPRTW05. Test fit all of the
pieces in place and sand them if necessary to make them fit
nicely. The wing joiner laminations are installed between the
spars and are sandwiched in place by the dihedral braces. The
C1 clamps can be used to hold everything in place.
D 7. When satisfied with the fit, mix up a batch of epoxy
(30 minute cure time is ideal, 5-minute is too fast), coat the
joiner laminations with a layer of epoxy and install the joiner
laminations between the spars. Quickly apply some epoxy to
the dihedral braces and hold them in place using the C1
clamps. Also apply some glue to the leading and trailing
edges and pin them together to keep them aligned with one
another. Wipe off any excess epoxy that may have squeezed
out before it cures. After the glue cures sand off any glue
globs that may have formed.
D 8. It is not necessary to wrap the dihedral braces with
thread when assembling a one-piece wing. Just disregard any
references or photos showing the thread.
D 9. Glue the 1/8" Plywood Leading Edge Brace in
place using thick CA. It should be centered (up and down) on
the leading edge because 1/16" sheeting will be added above
and below it later.
D 10. Locate one of the 1/16" x 3" x 24" Balsa Sheets
(SPRTW17) and cut it into 8 pieces 2-3/8" long. Slide one of
the sheets in place in front of the dihedral brace, trim it to fit
and glue it to the LE and the dihedral brace with thick CA.
Press the sheeting in place to make it conform around the
thread. A second piece of balsa can be used as a shim to hold
the sheeting against the LE as shown in the sketch at step 20
on page 12.
D 11. Glue another piece of 1/16" sheeting to the rear of
the dihedral brace, then cut a third piece to fit behind the
second and glue it in place.
D 12. Punch out six W1A ribs and six W1B ribs from the
1/8" die-cut balsa rib sheet (SPRTW01). Test fit these ribs
into position. A little sanding may be necessary to make them
fit properly. Glue all six W1A ribs and all six W1B into place
using thick CA (the two center W1B ribs are glued together).
D 13. Sand the top LE surface of the ribs with a sanding
block to remove any bumps or high spots, but be very careful
not to change the shape of the airfoil. Set the 1/16" x 3" x 24"
Balsa Leading Edge Sheeting (SPRTW17)in place on the
inner panel. The outer end of the sheeting should cover rib
W3A. Apply several strips of masking tape to hold it in place
and act as a hinge for the gluing process.
17