My granddady use to call them indain umbelas because lighting won't strike them.
I built a bow 66"s,55#"s at 27"S I think about 20 years ago.Backed it with rawhide.I talked to the guy about 5 or 6 years later and he told me he still shot and hunted with some.And it was still like the day I made it.Same poundage and and an inck of string follow if I remember right thats what it had when I gave it to him.