Bill:
I recently completed (sort of) a stall sequence on a 235 with a rotary engine.  Noticed a slight wing drop on power off and power on stalls.
Started accelerated stall sequence and low and behold this thing will suddenly snap roll with you with no warning.  Nose down it goes like a rocket.
Returned to airport. Miller time.
Stall testing has been delayed - permanently.

Hank Huddleston