wrote in message
ps.com...
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.

Still goes back to total design, not just numbers. Look at the blades on
the huge windmills used to generate electric. Usually three long narrow
blades.

As for aircraft, one reason to use the three or four blades over just two is
ground clearance. When the tail comes up, you don't want the blade to hit.