I wonder how many of the stall spin accidents we hear about happening to seasoned pilots can in part be attributed to out of rig aircraft.
It appears to me as we become more skilled we overcome flying discrepancies, an attribute some of the aircraft's quirks to being the nature of that aircraft.
Awhile back I flew a friends aircraft that he thought flew pretty well. He is a seasoned crop duster pilot.
The wings were so unsymmetrical that as I approached a stall I found myself using a lot of left rudder to keep it from yawing to the right.. This aircraft had over 5 degrees of wash in on the right and seven on the left. It should have one degree, which with loading causes it to theoretically be set at zero. One flap was also low.
After a day of measuring marking and re-rigging it fly's totally different.
The nose stays straight, it just mushes in the stall. And a spin entry is quickly stopped in either direction by normal recovery techniques. With very little rudder needed to keep the nose straight.
I cant help think that any average pilot could have never recovered this
aircraft from a inadvertent spin entry and the results would have been catastrophic.