The flying wires are for extra needed support on the tail plane of the model. On some really extreme manuvers there is a lot of stress that the tail sections sees so the flying wires just helps them to distribute the load around the section.
Sullivan makes a flying wire kit which ive installed twice on differant models. Works very good but, it does take a little effort and time to set up.


granted its not the best of pictures but you could see on my vectorflight edge ive installed the sullivan flying wires. It sure does keep the tail section together.