Patch Repair More Than 8 Inches; Stitching - Cub Crafters CC11-100 Maintenance Manual

(6) PATCH REPAIR MORE THAN 8 INCHES

(a) For large fabric repairs such as a wing tip, start at the last good rib, or at a
convenient location close to the damaged area, removing the old finish tapes.
(b) Cut the rib laces.
(c) Clean off all the coatings with MEK down to the fabric so that there is at least a 2
inch overlap over the rib.
(d) Glue a whole new piece of fabric to cover the wingtip with a 2 inch overlap over
the rib area.
(e) Heat shrink.
(f) Apply the first application of Poly-Brush as described previously.
(g) Secure the fabric to the rib, in the same manner it was previously, by rib stitching
or with broad-head pop rivets. For rib stitching see the instructions at the end of
the Section.
(h) Apply tapes as described previously.
(i) Apply the second application of Poly-Brush as described previously.
(j) Then apply Poly-Spray as described previously.
(k) Paint to match original paint.

(7) STITCHING

A modified seine knot will be used for stitching and the knots and stitches will be hidden
under the fabric. The following text and sketches describe how this is accomplished.
Tie the first loop with a square knot as illustrated in Step 1 (Figure 6.4.1) and secure the
knot with a half hitch on each side after the lacing is pulled tight around the rib (Step 2
Figure 6.4.1). Then route the needle under the fabric and out through the next lace
location, then back down through the wing as illustrated in Steps 3 and 4 (Figure 6.4.1).
Tie a modified seine knot as illustrated in Steps 5 through 11 (See Figure 6.4.2 and
Figure 6.4.3).
(a) Rotate each lace loop to place the knot at the side of the rib cap to reduce the
protrusion and aerodynamic interference before moving to the next lace location,
then route the cord under the fabric to the next lace location as illustrated in Step
3 and 4 (Figure 6.4.1). Cut the cord end off leaving a minimum of 1/4-inch stub
pulled inside. Lacing tension should be uniform.
(b) Repeated pulling of long lengths of lacing cord may remove wax coating from the
cord and cause fraying. Convenient lengths of rib lacing cord may be used to
6.4
Page: 6
CUB CRAFTERS, INC.
CC11-100 MAINTENANCE MANUAL
Manual number SC10000AMM
Date: 04/18/2013