Great Planes PT-60 Kit - GPMA0119 - Manual (Page 27)

D 13. Wick thin CA under only the bottom spars and the
bottom edge of the ribs from one end of the wing to the
other, gluing the bottom sheeting from the inside of the
structure. Gently press up on the sheeting from underneath
the wing to keep it in contact with the ribs. Glue the
sheeting to the LE from the inside with thick CA.
D 14. If necessary, lightly sand the tops of the wing ribs to
even them up. Make sure there are no glue bumps or
imperfections that will prevent the sheeting from fitting well.
BEVEL THE SHEETING AS SHOWN
D 15. Trim a 3/32" x 4" x 36" balsa top LE sheet to 3-7/8"
wide. Sand a slight bevel along one edge, then test fit the
sheet (beveled end forward) between the LE and the rear
edge of the top spar. Sand the root end of the sheet to fit
evenly on the centerline of R-1.
D 16. Hold the sheet tightly against the LE, then wick thin
CA into the joint along its full length. Wipe off any excess
CA before it cures.
D 17. Gently lift up on the sheeting. Then, working quickly,
apply a bead of thick CA to the top of each rib and the
spars. Roll the sheet into position and hold it there, applying
even pressure with a 36" straightedge until the CA cures.
D 18. Cut and fit the sheeting for the LE of the other wing
panel. Try for a nice butt fit at the center by careful sanding
and testing. Glue the sheet in position as you did in steps
16 and 17.
D 19. Cut two 5" x 8-1/4" pieces from the sheeting skin
you made earlier. The grain runs across the 5" width. Cut
these skins to fit between the spar and the TE on top of the
R-5 ribs. Glue them to the ribs and wing tips with medium
CA, leaving 1/8" overhanging both R-5 and R-6. Trim and
sand the sheeting flush with the R-6 tips.
D 20. Cut two 4-9/16" x 8-1/4" pieces from the sheeting
skin. The grain runs across the 4-9/16" width. Cut these
skins to fit the top center of the wing, from the "ledge" at
R-2 / R-3 to the center of R-1 C. Work carefully with a
sanding block to obtain a neat joint at the center. Glue the
skins in position with medium CA.
D 21. Remove the wing from the wing tip jigs and sand off
any glue residue.
D 22. Referring to the plans for the shape, round off the
LE to blend nicely with the tip.
D 1. Saw through the thin portion of the bottom of R-1 C
and remove the piece.
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