Figure 3-10. Canopy cross-section.  Figure 3-11. Airflow into the wing.  Figure 3-12. Front and rear suspension lines.  ered parachute wing should become too porous, more  groundspeed may be needed to pressurize the wing,  takeoff distance may increase, more RPM may be  required to hold altitude, and fuel consumption may  increase. Kevlar ®  is a common polyaramid used for suspension  lines. Its properties render it extremely strong, as well  as resistant to stretching or shrinking, and it is not sus- ceptible to temperature changes. However, one criti - cal drawback of polyaramids is that they tend to kink  or knot when looped around. When polyaramids are  used to construct suspension lines, they are encased in  a skin of a terylene product, like Dacron ®  or a product  with similar properties. Polyethelene materials, such  as Spectra ® , Dyneema ®  or Technora ® , are very strong  as well as more flexible than polyaramids, which  makes them more durable under hard use. However,  polyethelene materials are more likely to stretch or  shrink, and they are more susceptible to temperature  changes. If your wing is equipped with polyethelene  suspension lines, it is imperative you do not store your  Suspension lines must be constructed of very strong  materials, yet remain very small in profile to reduce  parasite drag. The most commonly used materials are  polyaramid and polyethelene, which are both carbon  based.  suspension lines come together at a point where they  connect with the riser. (The risers are the connection  between the suspension lines and the cart.) Many  manufacturers color-code the wing suspension lines  to assist the pilot in their preflight inspection and lay - out of the wing prior to inflation. [Figure 3-12] At first sight, the  suspension lines on the powered  parachute wing might appear like an unorganized wad  of strings. On the contrary, each line has a distinct  purpose and each line has distinct properties. The sus - pension lines are sometimes designated A through D  and differ between manufacturers; check your POH to  know the line labels for your PPC. [Figure 3-12] The  front suspension lines are located at the leading edge  and the steering lines connect to the trailing edge. The  3-6