At 07:51 AM 3/30/2003 -0800, you wrote: >I have an older Hades that has an Aerodynamic problem I've never been able >to solve. I'm hoping that may some of you guys that really know this stuff >could answer the question. > >At medium speed the plane will try to nose up if I speed up some. If I start >going fast, it wants tuck. The faster it goes, the more it wants to tuck. >I've experimented with CG, I've made the push rods as stiff as I can get >them and I've even tried sticking some wedge under the tail to change >decalage. Nothing has worked so far. > >What's going on here? Is the fuselage flexing or something? Do I just need >to just keep playing with decalage? I'd like to DS this plane but that is >impossible the way it is now. > >Thanks in advance. > >Randy Bullard
It could be the tail boom is flexing, however I have seen a similar problem with some older designs that used a lifting stab combined with an aft CG. This comes from old free flight designs. I first encountered this problem with the Maco Eagle back in 1975. In that case, the fix was to convert the stab to sort of a symetric section. I stripped the covering off the bottom of the stab and glued a 1/4 inch square balsa opposite the high point of the stab airfoil. I then recovered the stab convertig the bottom to a diamond airfoil. Not a very elligant solution but it worked. It was intended to be a temporary fix but I never got around to building a new stab before I sold the model. I am not familar with the Hades but if it uses plug in stabs, you might try switching the left and right stabs. I have also used this to cure some strange handling problems with a model. Chucck Anderson RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
