At 23:43 02 August 2016, wrote:
Can we agree that stalling is directly related to angle of attack and
secondarily related to airspeed?

Yes it is. The trigger for a departure is often the application of the
controls to change the attitude of the glider. Given one of the first
lessons we learn is the effectiveness of the controls in relation to
airspeed, the slower we are the more control needed.
In a constant banked turn the control movements tend to be much
reduced, the application of aileron in particular, with the consequent
changing of angle of attack at the tips of each wing, is much less.
The control required to increase or reduce bank in a turn is far less
that that required to go from level flight to banked turn. So is this a
factor? Certainly it should be that the increase in angle of attack at the

tip of the "upgoing" wing should be much less.
Like everything else in flying, if you do it right there is no problem.
When it is going wrong the application of control to put it right is quite

frequently our undoing.
To complete a 180 deg final turn requires one turn entry and one exit.
A "square circuit" requires two. In theory 50% less opportunity for
screwing it up.