@engineer,
That takes all the fun out of it!
What's an acre, a furling square?
That's 220 yards or 220 x 3 feet square
= 660 x 66o sq ft
= 435 600 sq ft
so the area required is 0.1377 x 435600
= 59982 sq feet, roughly 60 thousand
whoops, that's different.