Risers The Fuel Tank Figure 3-13. The risers are constructed of nylon webbing  that takes on the appearance of two straps incorporating a  main cable and a safety cable as one unit.  3-7 The powered parachute is usually equipped with  fuel  tanks ranging in capacity from 5 to 20 gallons. As  with any aircraft, knowing how much fuel your fuel  tank holds is crucial to flight operations. The light- sport aircraft powered parachute has no limitations as  to the size of the fuel tank, unlike its ultralight vehicle  predecessor. Most PPC powerplants require auto fuel  mid-grade or higher to be burned (see the powerplant  Alternately, the wing could have the same length ris - ers, and the cart could have a higher attachment point  for the left riser. This is why each wing is designed  for each cart and should not be interchanged: the wing  and the cart is a complete system.  Engine installations with a counterclockwise rotating  propeller require opposite adjustments. It is important  to know which direction the propeller turns for your  PPC to accurately counter turning tendencies. During flight, as discussed in Chapter 2, propeller- driven aircraft are affected by the rotation of engine  components and the propeller. This is commonly  referred to as the “left turning tendency,” which in - cludes torque and sometimes P factor. There are sev eral design features that have been incorporated into  airplanes to counteract the left turning tendency from  a clockwise turning propeller. Powered parachute de - signers can counteract the turning effect by chang- ing the length of the riser cables on one side of the  airframe. By decreasing the length of the right riser  cable, the wing is given a slight right turn, just enough  to cancel the effects of torque at cruise thrust settings.  This design feature of the powered parachute wing  risers makes it imperative not to mistakenly attach the  different length riser cables on the wrong side of the  airframe. Remember: the left main and the left safety  cables, from the pilot’s seat, are longer than the right  main and the right safety cables. Mixing the right and  the left cables will result in a pronounced left turn;  especially during takeoff when the engine is at full  throttle, which could jeopardize the safety of all con- cerned.  The risers are generally constructed of webbing,  which takes on the appearance of two straps that in- corporate a main cable and a safety cable as one unit.  [Figure 3-13] Some of the older designs of wings may  have braided wire cables serving as their risers. The  risers are connected to the suspension lines and to the  aircraft with various connections such as with D-rings  and eyebolts. Also known as “V lines,” the  risers are the intermedi- ate link between the suspension lines and the airframe  or the attachment point of the wing to the airframe.  Every line on the powered parachute wing is precisely  measured and fitted to a specific location. Therefore,  it is imperative to inspect the wing during preflight,  in addition to having the wing and its lines inspected  periodically by qualified technicians. The technician  will conduct strength tests as well as look for wear  and compromised attachment points; refer to your  wing manufacturer’s specifications for inspection  parameters. Under no circumstances should powered  parachute suspension lines be spliced or tied if sev - ered! Each line’s length and strength is specifically  calibrated. If you tie a knot in the line you will change  the specifically-engineered flight characteristics of the  wing, rendering it unairworthy.  equipment in  a place that might experience extreme  temperatures. The POH or owner manual provided by  the chute manufacturer will specify limits for tempera- ture and storage.