Hi Bill !!! It was great talking to you at the Spring Hill meet. I could tell that you are a very dedicated gyroplane enthusiast. As far as the full-size gyros go, it is true that the sheer size and weight of the Bensen teeter head contributes to the stability of the craft. The blades definately rise up and flex into a coning angle, bringing dihedral stability to the system. In addition, the 20 foot rotor can generate tremendous centrifical forces, allowing further stabilization of the rotor. Like you, I have spent countless hours experimenting with rotor systems, and would like to see the perfection of the teeter head (in model form) become a reality. In 1993 I was lucky enough to meet Dr. Igor Bensen (of Bensen Gyrocopter fame) at the Bensen Days fly-in here in Florida. He is a great guy, taking several hours of his time to talk gyroplane aerodynamics with me, and welcomed my demonstration of my R/C twin-rotor gyro. He encouraged me to continue the teeter head experiments, and left a great impression on me. At that time, I had already performed hundreds of hours of teeter experiments, and had a few successful 2-bladed heads performing satisfactorily. Though I spent the next several years flying the twin rotor gyroplane, I never gave up on the teeter head, and after a six year vacation from the hobby I am ready to revive the teeter head project. After 70+ flights on my twin rotor bird, I now have the confidence to fly some experimental craft. I shall keep my fellow enthusiasts posted of my progress here on this forum. It would be great to see you again at the Muncie meet, but I will probably not make it due to tight finances. If I don't see you there, perhaps we shall meet again at the next Spring Hill fly-in. In the meantime, have a great summer !!! Happy Flying !!! Charlie Anderson