Mike,
I've also sailed on jib only. And as I *think that* I recall, I was able to sail as high as 75 or 80 degrees off the wind if I really dragged the rudders a lot.
Were you actually able to tack? I definitely just jibed from tack to tack but did not even think that I would be able to tack.
On the same test day, I sailed bare stick only. I forget the exact results, but I was able to sail something higher than DDW in that configuration.
I do remember sailing a keeled mono hull into the wind with stick only. I was in a proteted marina. Had I been outside, the waves and current would surely have overcome the amount of lift I was generating of the mast alone.
I had GPS tracks of these tests but they all got fried when I lost a hard drive.
GARY