104% is 530 RPM, 114% would be 581 RPM
if you know how much a blade weighs and how far from the hub it's CoG is, you can just enter it right here and find out:
http://www.soft-calc.com/calculator/...culator_e.html
The centripetal (or centrifugal) force increases at a more than linear rate, but I don't think it would double when increasing RPM by only 10%.