I think, maybe I'm starting to get a handle on what will work. I think SACKRC has brought out a very good point. If we run the airplane classes in a fashion similar to the boats, I think that you would break down into two main classes. One being the flying wings ie: DD, Shrikes and such. The other obvious class is then the conventional airframe with tail. These two classes would then be broken down into displacement catagories. I think this is the direction I want to go in. I still need more input from you guys. What displacements should be grouped together? Should it be maybe 25 to 35, 40 to 46, 50 to 65 ??? evan-RCU, like you, I also want to have a "run what you brung" class. I also believe that it would be an interesting event. It could be called X-open, X for experimental and open for anything goes. {Any airframe, any engine and any fuel.} This class would only be governed by safety issues. All airplanes, for all classes would have to pass a safety inspection. Then there is also the fuel issue. Nitro content? Maybe the event host would supply the fuel so as to maintain parity on the fuel used. I think, the fuel should be standardized to one specific nitro content. 15% 20% 30% ??? OK guys, your turn. What do you think? I am sure their are some of you who are better versed in the engine side of this than myself.