I have had my prop guards installed since before I started flying (12 flights) and feel comfortable with the control I have over the Phantom, haven't bumped into anything except for this afternoon when I was flying in an enclosed area outside and it got clipped on a bush breaking 2 props, but I'm wondering what the string that came with the props does and how much more protection they give. I really just want to fly without the props which I will next time I'm in an open area but yeah, wondering what that string does, thanks.