George wrote:

You proved the other poster's point. Many light civil aircraft have
two bladed props. Light and low powered WWI had two. High
performance fighters and heavy bombers from WWII have four blades. More
blades move more air.


Actually he didn't. The number of blades have nothing to do with
efficiency. The most efficient propeller is actually one blade. Multi
blade designs are used for other reasons.

Like modern submarines with, what, TWENTY blades on the propeller?