Quickie Q2 Lite Construction Manual - page 30

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,