Chris OCallaghan wrote:
....
When thermalling, use flap position 4, or drill a hole between
positions 3 and 4 if you want less drag.

Thank you, Chris. My 20B had a 3.5 hole drilled when we bought it but I
had no advice on its purpose or use. I was puzzled when I couldn't
relate the Flight Manual descriptions to what my glider had. Eventually
I worked it out.

I would be interested in any advice anyone can give on the use of 3.5.
I tend to use it for nearly all thermalling and only use 4 for landing.
Am I right? Is a 3.5 hole common? Did Schleicher's get it wrong?

GC