I'm in over my head a little with these adjustments. Ther rate of turn is effected by at least four things: the elevator-flap ratio, the CG, the total throw of the surfaces, and the line spacing at the handle.

But based on what I do know, I would set the flaps and elevator in a 1:1 ratio-same amount of throw on both. Some of the classic planes work better with the flaps a little slower, like 2:3 ratio. But the Twister should be OK at 1:1.

A good starting CG is right at the wing spar. If it is a little "jumpy", try adding a little nose weight until it grooves in level flight. Then you can adjust the turn by changing the throw of the surfaces or adjusting the line spacing at the handle.

Typically, 30 degrees of control movement is plenty for our purposes. A lot of older plans show 45 degrees, but it's really too much for stunt. I think the surfaces on my Pathfinder move 26 degees and it turns very nicely. Too much motion just stalls the surface and defeats your purpose.

The contemporary theory is that you make the plane really stable in pitch, then add enough tail volumn to make it turn a square corner. If it overshoots the corners, narrow the handle spacing or back off the control sesitivity until you can make a tight corner without overshooting.

One of the Fancher mods to the Twister is to enlarge the horizontal tail about 20% or so, and lengthen the fuselage 2 inches at the rear. The change brings it more into line with current thinking. Not a miracle worker, but it will make the Twister fly a bit smoother and with more authority.

FWIW, most nice stunt ships now use a 4 inch bellcrank rather than the 3 inch that is so common. It gives greater leverage, and guys describe it as being like power steering.

Oh yeah, don't run the engine for peak RPM. If you have good airspeed and tension over the top, you probably don't need more speed. The problem with these Schneurle RC motors in stunt planes isn't a shortage of HP, it's keeping the power regulated. If it tries to run away with you (going way lean and "winding up" in loops), you may need a smaller venturi or more restrictive muffler. In fact, an easy way to play with the CG is to go to the stock muffler and see what the weight and the extra muffling do to you.

Gads, getting tired from thinking too much...