Quickie Q2 Lite, Construction Manual

Page: 57 / 299

construction technique is your ability to visually inspect the
structure from the outside. The transparency of the glass/epoxy
material enables you to see all the way through the skins and even
through the spar caps. Defects in the layup take four basic forms:
resin lean areas, delaminations, wrinkles or bumps in the fibers, and
damage due to sanding structure away in finishing. Resin lean areas
are white in appearance due to incomplete wetting of the glass cloth
with epoxy during the layup.
DRYNESS CRITERIA
..... Pick any 6"x6" square in the layup in the critical area. Assess
carefully if any evidence of air in the layup is present (white
flecks, bubbles, air at the foam face). If the dryness is more than
10% of the area, the part MUST be rejected. Reject or repair any
evidence of dryness or voids in the trailing edge or leading edge
overlaps. Better yet, do an adequate inspection with good light
before cure when it's easy to fix. If in doubt on overlaps be sure to
stipple in enough epoxy.
..... Delaminations in a new layup may be due to small air bubbles
trapped between plies during the layup. The areas look like air
bubbles and are distinctly visible even deep in a cured layup. Small
delaminations, or bubbles up to 2-inch diameter, may be filled with
epoxy by drilling a small hole into the bubble and filling the void
with epoxy.
..... When making a layup, do not be concerned if the brush
occasionally sheds a few bristles; these do not need to be removed.
If the bristle count exceeds about 10 per square foot, change your
brush and remove bristles.
..... Occasional sanding through the weave in the first skin ply is
not grounds for scrapping the part. Care should be exercised in
areas, such as the skin joints, not to weaken the structure in
pursuit of an optimum finish. An excess of resin (wet) will make your
airplane heavy and does weaken the layup, but usually not enough to
reject the part for strength reasons.
BUMP/JOGGLE/DIP CRITERIA
..... The best way to check this is to lay a 12-inch straightedge on
the part spanwise. Move it allover the surface in the critical areas.
If you can see 1/16" gap in any area, the part must be repaired. It
is best to repair or beef up lumpy areas even if they meet this
criteria. Better yet, do a good job in core preparation and use your
squeegee well in the lay up to avoid the lumps in the first place.
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