Interesting thoughts about a glider that has been around--and much loved--since the late 1970s. I have less than 10 hours in two ASW 20s (a very early one and a later A) so I can't speak from experience. When it began to develop a bit of a reputation back in the 1980s, I heard a story/rumor/speculation that the fabric tape used to cover the flap/wing joint might be to blame if it bulged out into the airflow during slow flight and triggered separation. No idea if that was true but subsequent models used Mylar seals (and/or beryllium copper for at least one ASW 20B) and I suspect most early models have been fitted with Mylar. If I were buying a '20, I'd look at the seals--and CG--closely just to be careful.

Chip Bearden