On Wed, 3 Apr 2019 07:20:42 -0700 (PDT), Steve Leonard
wrote:

On Wednesday, April 3, 2019 at 1:53:19 AM UTC-5, krasw wrote:
ASW 20 was ahead of it's time and in reality belongs to same generation as Ventus/LS6 (except that final bit of wing loading). ... All Wortmann FX170-profiled gliders are older generation performance-wise. If it rains or you get bugs on leading edge, you fall out of sky like an anvil.

But, the 20 uses the older (and maybe better?) 62K153/131 family. Maybe that is why it was ahead of its time? Because it used an older airfoil section. Like its big brothers, the ASW 12 and ASW 17.


Interesiting side note:

Luc Boermans recently told me that ALL his airfoils are based upon the
FX 62K-131 of the ASW-20.

The FX67 was a one-trick pony that was impossible to cure of its
extremely bad performance when wet or dirty.


Thus said: The ASW-20 and LS-3 are similar in performance as long as
they are clean and dry.

Once an LS-3 gets dirty or wet, the performance loss is drastic - the
20 hardly suffers. One clear point pro ASW-20.

Cheers
Andreas