I remember going to the field, before college, and we went no matter what the wind was doing.
If it was too windy to really do any precision work, I would launch my Veco T-bird and after it cut out, I would wind fly
as long as I wanted to, and as long as the winds would allow. My friend and helper, Dave Bates, would hand launch
in higher winds, where I could whip it a quarter circle, and then climb away into a large lifting loop, ready for the next
approach to continue the precess and build speed. Once you did that, you could perform more challenging maneuvers.
I actually got so that I could do square loops and triangles, consecutively. My reach was
about 150-165 degrees of the globe. side to side. You could go big and relatively high ( 45-50 deg.) as long as you could feel
the lift in the lines. You need a keen idea about wind effects on your model, and an intuitive sense of wind strength and direction.
It's a lot easier than you think - you just need to understand how it feels and what to do next when it does.
If you have line tension, then where you are in the hemisphere, works. When you sense that line tension is getting
less you learn to move to another direction to regain it. Then it becomes almost like flying one of those
stunt kites you control with two hands.
And you need clean air, away from buildings and trees. A large field is best. Near the sea, perhaps.
As far as line length is concerned, you can fly any normal line length you have - 60-66 feet eye to eye
My field was located next to Narraganset Bay, Warwick, R.I.. it was always a blast.