Quickie Q2 Lite, Construction Manual

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Q2 Plans - Chapter 3 - Page 3-03
..... UNI cloth has 95% of the glass volume woven parallel to the selvage
giving exceptional strength in that direction and very little at right
angles to it.
..... BID is generally used as pieces which are cut at a 45-degree angle
to the selvage and laid into contours with very little effort. BID is
often applied at 45 degree orientation to obtain a desired torsional or
shear stiffness. UNI is used in areas where the primary loads are in one
direction, and maximum efficiency is required, such as the wing skins and
spar caps.
..... Multiple layers of glass cloth are laminated together to form the
aircraft .structure. Each layer of cloth is called a ply and this term
will be used throughout the plans.
..... Marking and cutting the plies of glass cloth is a job that you will
repeat often in the construction of your Q2. Glass cloth should be
marked, cut, and stored in a clean area with clean hands and clean tools.
Glass contaminated with dirt, grease, or epoxy should be discarded. A
clean, smooth surface is needed for marking and cutting. The area used
for storing and cutting glass cloth should be separated from the aircraft
assembly area because otherwise it will be exposed to foam dust, epoxy,
and other things which can contaminate the cloth. You will need a good
sharp pair of scissors, a felt-tipped marker, a fairly straight board,
and a tape measure for marking and cutting. The small amount of ink from
marking and numbering plies has no detrimental effects on the glass
cloth.
..... In each step the size, type, and fiber orientation of each ply is
given. Take the list to your glass cutting table, rollout a length of the
appropriate cloth, straighten the selvage, mark all of the plies, and cut
them.
..... Now is a good time to stop reading long enough to go and cut a
square ply of BID and see how easy it is to change its shape by pulling
and pushing on the edges as shown in the sketches. Cut a square with the
fibers running at 45° and pull on the edges to shape the piece.
..... It helps if you make fairly straight cuts, but don't worry if your
cut is within 1 inch of your mark. As you cut BID, it may change shape,