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George

wrote:

fixed top posting

On Nov 13, 5:51 am, "Edwin Pawlowski" wrote:
"spammer" wrote in message

ups.com...

On Nov 13, 12:43 am, " wrote:
We see ceiling fans with 3, 4 and 5 blades. Does blade number matter
for performance, quiet, vibration, etc?
Thanks
Lynn Willis
Indianapolis
Fans with three or four blades move more air than five or six blade
fans. They are harder to balance than the five or six blade fans
though.
The number of blades indicates nothing. The size, pitch, airfoil design,
and rotational speed determines how much air it will move. Take a look at
airplane propellers.

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.