pounds per square inch; tear strength —5
pounds; air permeability —80 to 100 cubic
feet per minute.Tensile strength is the greatest
stress cloth can withstand along its length
without rupturing, expressed as the number of
pounds per square inch. Tear strength is
the average force, expressed in pounds, re-
quired to continue a tear across either the
filling or the warp of the cloth. A i r
permeability is the measured amount, in cubic
feet, of the flow of air through a square foot of
cloth in 1 minute under a specific pressure.
The suspension lines are sewn into the canopy.
These lines run continuously from the connector
link on one side, through the canopy, and to the
connector link on the other side (fig. 1-5). The
material between any two suspension lines is called
a gore. There are 28 gores in a 28-foot canopy.
Each gore is composed of four sections identified
Figure 1-5.—Suspension lines on 28-foot canopy.
1-7
