Helifreak, have you actually tried using a significantly longer or shorter flybar? A shorter flybar will respond quicker in actual practice and in theory because it is a smaller gyroscope, if you will, and can be moved off it's axis of rotation more quickly than a longer one. The leverage is less and the paddles are moving more slowly, so it will not have the same authority as a longer flybar will, all other things being equal. If the up and down travel of the flybar is not restricted, then a longer flybar will give a faster ultimate cyclic rate. This is an important point as the shorter flybar may also reach full travel if the movement is sufficiently restrictive. In that case, the cyclic rate would be equal regardless of length and the only noticeable difference between the two is that the shorter one responds more quickly.The longer flybar will respond somewhat more slowly, although "somewhat more slowly" is still faster than even the fastest human reflexes can respond. I have experimented with flybars from 300 to 720mm in length, and within that range, longer flew better every time. You get both more hovering stability and more cyclic authority - one of the few places in heli design where you can get both almost for free. As a practical matter, lengths over about 600mm on a 60 size heli gave only minor improvements and the flybar was so long that I was forever catching it on a doorway or car trunk and bending it. Hope this helps. Steve.