Here is one flying. It doesn't show much otherwise. http://www.youtube.com/watch?v=N_wRbhaZYXc I found they just barely can fly a plane. A loop would never happen for instance. I have never used the helical type unit though, just the basic monoline airplane springy unit. The plane shown had the mere Canadian record until the class was changed to profile proto. I just used a piece of flying wire through the wing, and soldered a horn in the centre. It was anchored at the wingtip, and the protruding end with the eyelet was attached to the flying wire and then the handle which is the long one in the other pic. This is not the one the OP was referring to with the gears, just the Stanzel handle I think. This one flew clockwise so the torque would not bank it into the circle. Really that is the 'right' way to fly control line. At that time the wire was .014" solids, on 42'.