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Old Jun 26, 2012, 10:46 PM
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USA, AZ, Glendale
Joined Jan 2002
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Hi Peter,

I see you are a commercial pilot

The question about the number of blades does not have a specific answer based on a lack of factual and comparable data. The problem is there are no standards, and much variation, for the design of the fan and its blades. Some fans have narrow and thin blades while others have much broader blades with well defined airfoils. The blade airfoils also vary from one maker to another. Certainly the nose piece of the fan has an impact on its performance.

So many variables make knowledgeable comparisons and conclusions difficult. I am sorry, I know that is not the answer you would prefer.

Old_dude
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