RE: Lowering the stab on a four star 40
I've flown my modded 4* once now. Due to some of the modifications (control surface/throw enlargements) my 4* is a real handful.
It is a real eye opener when you can whip the plane around one wheel. The lowered hstab has indeed improved the tuck problem, although it does still tuck a bit. Snap rolls don't look quite right anymore, although I think this is too much aileron, which overpowers the snap. I will probably put dual rates on to 50% for the ailerons and see if that helps. Once the field melts and dries, I will be further refining the flight of this bird. I think that this is a good mod, although I would recommend doing the modifications one at a time if possible.
For a recap, her is what I did...
Clipped the wings 4" per wing. - Increase roll rate, landing speed, decrease float. 1 bay is 3", removed another inch to make fit in trunk. Definitely recommend.
Increased area on all three control surfaces. - Increased controls to allow for tighter maneuvers. Jury is still out on how good of a mod this was, although the large surfaces look very cool.
Lowered the horizontal stab. - Tried to remove a trait in the four stars that resulted in my crash. (While using the rudder, the plane pitches downward.) Jury is still out on whether this was a good mod.