Two more thoughts on this. Control responsiveness is quite a bit to do with airplane design. For example, I'm able to snap, spin and one-roll loop on low rates with the Brio. This is very interesting- would not be able to do that on the Focus.

Another thought- I was thinking about servo speed, control responsiveness and servo setups.

The mainstream line of thought is that one wants to move the control horn away from the surface as much as possible, and only put in enough throw (mechanically) so when you fly on low rate you are maxed out on the stick deflection, with 100 percent throw rate. Anything above 100% ATV or dual rate and its going to lose resolution on the PCM.

What about effective servo speed? To get a nice clean snap, one wants crisp responsiveness on the controls. Here is a thought. If you move the control horn in closer to the surface rather than far away, and then use dual rates, so high rate is for snaps, basically you've sped up the (effective) servo speed. You move the Tx stick and the control surface moves faster because its got a lot of throw (but not all of it is utilized). I'm going to give this some more thought.

If I could draw my own expo curve, I'd want it to be insensitive around neutral yet not as steep of a curve (elbow) on the mid-stick. See, too much expo results in inconsistent roll rates and a "pitchy" elevator. If you are flying and having a hard time maintaining consistent heading or roll exits (hunting) you may have too much expo. By moving the control arm in, and then taking back the dual rate, it flattens out the expo, and quickens up the servo response. The trade off is loss in servo resolution, but what loss is that (at least on a windy day as most seem to be these days).

Random thoughts on control throw philosphy.

Don