This weekend, I decided to try out my TurboFly sloper for the first time in a few years. What is a TurboFly you ask? Well, its the fuselage from a 50" DCU Dragonfly that has been mated to the wings and tailfeathers of a 50" span CR Turbo S. So, basically, its like an original wood Turbo with a fiberglass fuse. The plane flies great except for one thing.....the problem I've always had with this plane is I guess what you would call "tuck under" or tuck-in. That is, in an extended high-speed dive, the nose will start to drop, and it will continue to go downward at a steeper and steeper angle unless you pull back on the stick or give it lots of up trim. A few years ago, my solution to this problem was to add lots of nose weight, which cured it. However, this puts the CG all the way at the leading edge of the wing, which just doesn't seem right (as designed, the Turbo's CG is at the wing rod, at about 1/3 MAC). With the CG at the design point, the plane doesn't feel tail heavy or twitchy, so my guess is that the real problem is something other then the CG. I can only think of a couple other reasons as to why this is happening: 1) Incidience. I've measured the wing incidence/decolage at +1 degrees, which seems about right to me. Maybe it's not enough. Would not having enough positive incidence prodcuce the tuck-in effect I'm seeing? Should I go for 2 degress? 2) Tail moment. I tried to match the nose and tail moments of the wood Turbo as much as possible, but I think my horizontal stab might be 1/8"-1/4" closer to the wing then it should me. Still, this seems like a pretty small amount. Could this be it though? Any help would be appreciated. ____________________________________________________________________________ Brett Jaffee: [EMAIL PROTECTED] Brett's Slope and Power Home Page: http://home.earthlink.net/~jaffee OnTheWay Quake 2 server utility: http://www.planetquake.com/ontheway The Unoffical Extra 300 Home Page: http://www.bayarea.net/~nathan/extra300/ ____________________________________________________________________________ RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
