What is the optimum pitch angle for ceiling fan blade design?

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The discussion centers on designing an efficient ceiling fan blade with an airfoil section, tapering, and twisting. There is skepticism about the effectiveness of airfoil designs compared to flat blades, as traditional ceiling fans typically use broad paddles that do not spin fast enough for narrow blades to be beneficial. However, one participant acknowledges that airfoil sections can be practical, especially when starting with a wider chord that tapers down. The conversation highlights the need for further insights and responses from others in the forum. Overall, the quest for the optimum pitch angle remains a key focus in achieving high efficiency in ceiling fan blade design.
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For the final year project that i am doing, I need to design a high efficiency ceiling fan blade with airfoil section, tapered and also twisting. Can anyone tell me how can i obtain the optimum pitch angle for different section of my ceiling fan blade?
 
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I doubt that an "airfoil section" will make much difference over a flat angled blade in a ceiling fan situation. Most use very broad "paddles" as opposed to "propellors" such as an aeroplane would have. They just don't spin fast enough to use a narrow blade. It's hard to impart an airfoil shape to a fat one. I might be missing something here, though, so wait for a response from someone else.
 
Danger said:
I doubt that an "airfoil section" will make much difference over a flat angled blade in a ceiling fan situation. Most use very broad "paddles" as opposed to "propellors" such as an aeroplane would have. They just don't spin fast enough to use a narrow blade. It's hard to impart an airfoil shape to a fat one. I might be missing something here, though, so wait for a response from someone else.
no one is replying me...zzzzzz.. tis article have show that the airfoil section for ceiling fan blade is practical
 

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I stand corrected, and am actually quite impressed by those figures. In my defence, I didn't realize that the blades started with a 6.5" chord and then tapered down. I was envisioning about half of that.
Hang in there; somebody is eventually going to show up.
 
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