Steve wrote:
HeyBub wrote:
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?


Now you're touching on why you want more blades - they run quieter.

--Steve

Exactly, a lot more to do with trying to achieve stealthier operation
than any other reason.