[QUOTE=joe yap]Not surprising at all. I have even seen a 2 bladed fan design. You can also see that the fan blades are much broader to absorb the power of the motor, unlike the skinny GWS fans.
Thank you Joe for your feedback.
I have been toying with the two bladed EDF fan concept for quite a while using broad blade and a wide range of pitch as you have described. I did get some good result at low power setup. Unfortunately at higher power(higher rpm setup) I ran into severe vibration and resonance situation so I drop the idea for the time being.
May go back to the two blade EDF concept once I figure out how to eleminate the vibration issues.
On cutting down or reduce blade setup ....
I don't just remove and reduce the blade count, to match the motor but also explore other type of 3 blade (very soon some other 4 bladed propeller) with different pitch, broadness and thickness cut and balance to fit the EDF shroud.
However, I did get pretty good result interms of efficient and reasonable thrust with some of this modification when they correctly match the motor.
Cheers
Thank you Joe for your feedback.
I have been toying with the two bladed EDF fan concept for quite a while using broad blade and a wide range of pitch as you have described. I did get some good result at low power setup. Unfortunately at higher power(higher rpm setup) I ran into severe vibration and resonance situation so I drop the idea for the time being.
May go back to the two blade EDF concept once I figure out how to eleminate the vibration issues.
On cutting down or reduce blade setup ....
I don't just remove and reduce the blade count, to match the motor but also explore other type of 3 blade (very soon some other 4 bladed propeller) with different pitch, broadness and thickness cut and balance to fit the EDF shroud.
However, I did get pretty good result interms of efficient and reasonable thrust with some of this modification when they correctly match the motor.
Cheers
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