Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 16)

D D 16. Wick thin CA along the joint where the outer
trailing edge contacts the sheet and also to each rib. Glue
both servo rails to the R6 ribs and glue the aft servo rail to
the sheeting. Wick thin CA into the notches in the inner
trailing edge at each rib and glue the inner trailing edge to
the trailing edge sheet.
HOW TO MAKE A BEVEL
The following process will help you create a bevel that is
right the first time.
D D 17. Confirm that the leading edge is still centered
and each rib is tightly fitted into the notches. Refer to the
sketch at step 14 to see how the leading edge matches the
ribs; the leading edge is tilted downward somewhat. Wick
thin CA into each joint.
D D 18. Install the top 1/2" x 1/2" x 40" basswood spar.
Confirm that the top of the spar is flush with the top of each
rib and make sure the ribs are vertical (90°). The outer tip
of the spar should be flush with rib R8, just like the bottom
spar. Glue the spar in place with thin CA.
D D 1. Locate the die-cut 1/8" plywood wing tip brace,
the die-cut 1/8" balsa wing tip rib R9 and your previously
assembled outer wing tip. Sand off the "die-cut bump" from
the wing tip brace.
D D 2. Fit the wing tip rib R9 into the plywood wing tip
brace and slide the assembly into the ribs along the spars.
Slide the previously prepared outer wing tip into position.
Refer to the following Expert Tip to bevel the leading edge
of the wing tip.
A) First, you need a fresh, full sheet of 220-grit
sandpaper. Draw the bevel lines and reference lines on
the part. The bevel lines are the lines that you sand to.
The reference lines are lines slightly over the size of the
bevel that you use as a reference in order to keep the
bevel parallel.
B) Sand to the bevel lines. The method of sanding is
important. Sand only in one direction - usually "dragging"
the part is best as it keeps it from "chattering" and
creating the unwanted rounded bevel. It helps to imagine
the angle of the bevel required as you begin to sand. Just
take a little off at a time and mind your border lines.
C) After careful sanding and frequently inspecting your
work as you go, you will have a sharp, accurate bevel.
The bevel is parallel to the reference lines.
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