On Oct 23, 3:12 pm, Nyal Williams
A fully locked rudder slip won't allow much opposite aileron before it starts to turn off course.

Was that comment related to a specific type or was it a general
comment on characteristics of all gliders?

Specific to the ASW-19B (that I owned and with the CG I flew it at) -
I could sustain a stable slip with full airbrakes, gear down, with
the rudder on the stop and the stick hard in the opposite corner. I
practiced this at the start of every season and it saved a couple of
very tight off airport landings for me.

Andy