Great Planes PT-60 Kit - GPMA0119 - Manual (Page 26)

D 4. Cut two 3-1/2" x 8-1/4" pieces from the "skin" you just
made. The wood grain must run in the 3-1/2" direction. Turn
the wing upside down (so that you are looking at the bottom
side), then trim the two skins to fit between the spar and
the TE, covering the two R-5 ribs at both wing tips. One
edge of the skin should be flush with the outboard side of
the outer R-5 rib. Glue the skins in place with medium CA.
D 9. Use a sanding block and 150-grit sandpaper as
shown, to sand a bevel on the top edge of the R-6 wing tip
to match the height of the top of the R-5 ribs. Keep light
pressure on the R-5 ribs but don't sand through the
masking tape. NOTE: The R-6 wing tips must be 3/32"
below the top edge of the LE and TE, just like the R-5 ribs.
D 10. Cut and sand the LE and TE tips to match the angle
of the wing tip.
D 5. Locate the two die-cut 1/8" balsa R-6 wing tips,
position them as shown (to make a right and a left), then
draw a line 3/16" from the straightedge as shown.
D 6. Sand a bevel on both R-6s from the bottom corner of
the straight edge to the line.
D 11. Locate the two 1-1/2" x 36" wedge shaped
ailerons. Cut one 3-1/4" piece from each aileron to use as
TE tips. Check that the bottom surface of each TE tip is
flush with the bottom sheeting when the TE tip is pressed
against the wing tip. If necessary, lightly sand the forward
edge of the TE tip to correct the problem. Glue the TE tips
to the TE with medium CA. Sand the outboard ends flush
with the angle of the wing tips.
D 7. Check the fit of the R-6 wing tips. Glue the R-6s in
position with thin CA, flush with the bottom edge of the wing
sheeting. It won't hurt anything if the front bottom sheeting
gets glued in the process.
D 8. Important: Apply two thicknesses of masking tape on
the top edge of both R-5 ribs. This will help prevent them
from being sanded during the next step.
D 12. Tack glue (remember, only a couple drops of thin
CA) the die-cut 1/8" ply washout jigs under both wing tips
at the location of the outboard R-5 ribs. Turn the wing right
side up, then add enough weights to hold the washout jigs
and wing firmly on your workbench. (Read the explanation
of "washout" on page 47.)
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