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| I as well noticed the difference when I went to XPS. I'm not a world class flyer, so use a lot of Expo to keep me from overcontrolling. With the Futaba 9c and Fm RX, I had the Expo set to 60 %, after using XPS, I was overcontrolling again, so on one particular plane that I fly most, I went to 80% to get back to where I didn't have so much problem with it. | |
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A couple of things...
80% is a *LOT* of expo! Are you sure your throws didn't increase when you switched to XPS?
Did you actually check to see if the throws were different when you switched systems?
The plane won't know what RC gear is being used and if a control surface is deflected by x degrees then the resulting response will be the same. If the control input acts a little more quickly due to reduced latency then it'll also respond more quickly when you remove the control input so overcontrolling shouldn't be an issue.
Remember also that we're talking about 10ms or so of reduction in latency over a PCM setup. With most servos being around the 0.15 second mark for 45 degrees deflection (0.3 deg/mS), which means even if you peg the stick, the control surfaces on an XPS system are only going to be 3 degrees or so ahead of the standard system in terms of servo movement.
Enough to make a real difference? I don't know.
If it's just reduced latency (which I doubt) then all you've got to do is fly a while until your brain adapts to the more immediate response.
If the latency is reduced then your plane should be *easier* to fly (after retraining your brain) because the control surface deflections will more accurately follow your finger movements.
I always found it a *lot* harder going from low-latency to hi-latency setups than the other way.
Adding expo *won't* change the speed at which your servos react to stick movement and 80% is a wicked-high amount of expo on any plane.
On my 3D profiles I have 55% expo and that's with huge surfaces with over 50 degrees of throw either side of neutral and I have no issues with it being too touchy or oversensitive in straight and level flight.
Even my 30% Extra 330L gasser has just 55% expo on elevators and ailerons and it's set up for 3D throws as well. I don't use dual rates (just another switch to flick (or not flick) at the wrong moment) -- I just learn to move the sticks a little less aggressively when flying on the wing.
This is probably the subject for another thread but how much expo are others using?