Posted: Oct 06, 2017 10:54 pm
I believe there is an upper limit to the size and we're close to it already where efficiency is lost with larger blades. Don't remember where I heard this though.
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=2587869#p2587869