On Friday, February 3, 2017 at 1:26:02 PM UTC-5, Jim wrote:
Thank you Tim. I am beginning to understand it all.

JIm

Those of us who flew hang gliders/paragliders already understand this relation between weight, area and efficency. Hang gliders have a lower sink rate and better glide than paragliders but the much larger area of PG allows them to slow down and turn very tight circles in lift so they can outclimb HG much of the time.