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

[Pang Chun Wai]

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?

 

[Danger]

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.

 

[Pang Chun Wai]

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

 

[Danger]

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.