1. Blade: To design and making blades we will use a PVC pipe of 72cm in long and the diameter of 16cm then traveled into two halves along its so that became each half-length 72cm, and then measured 10cm from one of two sides and 4cm from the other side on the same part of the two halves. We have making the blade by cutting the PVC pipe according the measurements described above using Jigsaw repeat the process three times as the number of blades. Each blade must be sharpening at the side that cut the air, the process described above shown below: