Hi @Mohamed Seidam,
Thanks for sharing your thoughts on the physics behind shortening the length of the kinetic rope for pulling out. I believe what @Lawrence_Chehimi stated in his thread explains the physics. Let me explain. The kinetic rope is used because the rope stretches and stores kinetic energy which releases and aids at the time of pull. When you double it up by shortening it the rope gets double the kinetic energy - not by tying 2 ropes together and making it longer. When you double up a rope the two portions act as 2 parallel source of pull with double kinetic energy. This doesn't happen when you double up a rope and increases its length as both rope acts like one. There will be an increase in kinetic energy but not so much as you connect them parallel. Moreover the force acts in a shorter path when connected parallel than connecting in series. I don't know much more than this to explain.