On Tuesday, June 2, 2015 at 2:25:00 AM UTC-4, Jonathan St. Cloud wrote:
Saw the quote below in another thread regarding spoilers open while turning (it was actually in the comment section under the video ) and was wondering if anyone could comment? This is the proper spin recovery technique.

"The ASW 20 killed a number of pilots by spinning inverted out of a steep banked turn with positive flaps in thermals. They would go full stick forward and rudder against the apparent rotation in an effort to recover which simply held them in the spin. "

I have never heard of the behavior you describe.
When the '20 was new, a lot of pilots still subscribed to the idea that it was good to fly at the aft CG limit to maximize performance. This seems to have led to a number of unexplained spin accidents when landing. I never heard of an unrecoverable spin, nor going inverted as part of the spin. Someone may well have over done the forward stick and gone negative in the recovery.
My first '20 had some undocumented tail ballast that made it very ugly when I first flew it. I was quite proficient in spins so no bad came of it.
Interestingly the addition of external seals that came along later made the spin characteristics a bit more benign. Obviously some internal flow was going on in the trailing edge area.
'20 recovery is normal. Opposite rudder, neutralize stick, flaps neutral. When winglets are added, it is a bit more resistant to spinning, but slightly more abrupt when it departs, likely due to blanking of the tip by the inboard stalled winglet.
FWIW
UH