I don't know if knife edge would be the best test for setting the ailerons. I'm thinking something along the lines of doing upright and inverted harriers and adjusting the reflex until both feel about the same. I could be wrong but I'd imagine a lot of reflex (ailerons up) would make upright harriers a breeze but make inverted ones pretty nasty. Right now my Extreme feels close to the same in both upright and inverted harriers. It doesn't lock in quite like my old one, but I think it'll get better when the CG comes back.

Both my Extremes tuck to the belly with rudder in a knife edge, but I noticed something interesting on the second one... with small rudder inputs it will just hold knife edge at high speed... and with small rudder inputs it has a mild pull to the canopy. If I go to bigger rudder inputs then it tucks to the belly, full 3D rudder in the knife edge produces an outside snap roll.

I'm thinking that when I get the CG back further the plane should knife edge better on smaller rudder inputs, thus getting rid of the coupling problem. When the CG comes back I'll be able to get rid of some of the up elevator trim thats in there now, so the pull to the canopy should go away. And with the CG back I shouldn't need to get into the big rudder inputs for knife edge.It pains me to admit it, but I never really tried knife edge with smaller rudder inputs on the first Extreme, I never bothered to set a low rate for rudder, just ailerons and elevator. The new one has hi and low rates set for all the axes.

We'll see. More testing/trimming to come. Tomorrow looks like flying weather.