I put some side force generators at about half span on my E-Flite Tribute and it seems to have made the roll couple with rudder even worse.

They're 2" high top and bottom, and go from L.E. to T.E. (actually they end at the ail. hinge line )

What do you guys think of maybe making the top one taller than the bottom one, or vice-versa?

You got any theory or idea(s) as to the changes in the center of pressure or center of lift along the length of the fuse. while in knife edge flight? And what changes do SFG's make?

Where would you put the SFG's span wise on the wing?
How about the shape and height...and top vs. bottom area wise?

I have a lot of questions and ideas...but not a lot of real knowlege about aerodynamics...I just like to experiment, but I'd like to know the reasons why things happen when I make a modification, ya know?



Back in the mid 70's I made an airplane (original design ) that had huge tip plates on it, because I liked to do knife edge the length of the runway. The plane was a (K&B) .40 sized what would now be called "fun fly" type w/ a Sullivan PDQ foam wing clipped to 42" and a fuselage that was of the absolute minimal size vertically and of width.
It had a flat top, kind of like a Kaos, but I put what I called a "knife edge ledge" all along the length of the top that was a 1/4" lip that acted like a chine to hold the air on the side of the fuse. while in K.E.

The H9 Showtime brought back memories, and spurred me on to adding SFG's to the Tribute, and seeing the G.P. Turmoil, with it's design of SFG's, I'm wondering what you guys might have to say about the subject...



Thanks...Tom