Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 15)

D D 10 Slide the finished trailing edge sheet into
position. Don't reach for the glue yet Add rib R8.
D D 11 Locate the tapered balsa inner trailing edge If
you are building the clipped wing version, be sure the
rib notches line up with the rib locations on the plan
before cutting. Pin the inner trailing edge in position with
the ribs in the notches, then cut the outboard tip of the
inner trailing edge flush with the outboard edge of rib R5.
D D 14 Match the notches in the 42" shaped balsa
leading edge with the plan Add the leading edge to the
ribs (still no glue) making sure each rib is fitted into its
respective notch Center the leading edge so there is an
equal amount of space above and below each rib Cut the
leading edge flush with rib R2.
Double check your work Make sure all ribs are
contacting the trailing edge sheet and fit all the way
onto the basswood spar. Confirm that each rib meets the
spar exactly at its intended location over the plan After all
the fitting and Jiggling of parts, now is the time to be sure
the spar is still securely pinned to your flat building board.
Repin or add more pins if necessary
D D 12. Fit the ribs into the notches on the inner trailing
edge, then push it as far forward as it will go until the ribs
are fully seated Pull the sheet back until it is tight against
the trailing edge Pin the inner trailing edge and the trailing
edge sheet to the plan Install rib R2.
NOTE: Rib 2 will not contact the plan since the center
section will be sheeted later.
D D 13 Cut the 1/4" x 1/2" x 18" balsa aileron servo rail
stick into four pieces, 3-3/4" each Remove both R6 ribs
Install both servo rails Refer to the cross-section
drawing - be sure both servo rails are fully seated into their
notches The ends of the servo rails must be flush with the
ribs Reinstall the assembly over the spar and into the outer
trailing edge (I promise we'll be gluing soon).
Let's start gluing!
D D 15 Beginning with rib R3, use the die-cut 1/8"
plywood 90 degree triangle (indicated as "90") to make
sure the rib is vertical while you add a few drops of thin CA
where the rib meets the spar Don't glue rib R2 to the
spar until instructed to do so. Be sure the bottom rear of
each rib is contacting the trailing edge sheet Don't add too
much CA - we're just "tack gluing" now Add a few drops of
CA to R2 where it contacts the trailing edge sheet Glue the
remaining ribs to the spar and trailing edge sheet (don't
glue R2 to the main spar) making sure each rib is
vertical and contacting the trailing edge sheeting.
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