In a snap one wing has stopped flying before the other (or in some cases the tail stalls before the wing causing loss of directional stability...very common in WW-2 planes). Some washout at the wingtips can help somewhat, but a cap W/ quad. tapered wing is going to stall at a much higher speed than a sport ship with a hershey bar type wing. Once it happens all you can do is neutralize controls add power, gain some speed over the wing agian and hope you have enought alt. to recover. Notice the new "sport cap" from H-9 has a very large tail and larger wing to give it better slow handeling traits.
Brian