this post was submitted on 25 Jun 2025
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Drastically increasing the efficiency of Ceiling Fans [50%] | Tech Ingredients (www.youtube.com)
submitted 1 month ago* (last edited 1 month ago) by ProdigalFrog@slrpnk.net to c/technology@slrpnk.net
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From a commenter under the video:

Summarized the measurements, with rough timestamps:

Stock blades (6:43): 1 m/s, 64.3 W,

simple airfoil (7:55): 0.8 m/s, 66 W

modern airfoil (9:12): 1.2 m/s, 64.5 W

stock motor no blades (13:49): 53.8 W

BLDC motor no blades (16:24): 8 W

BLDC stock blades (18:27): 1.8 m/s, 59 W

BLDC stock blades at reduced speed (19:35): 1.0 m/s, 27.3 W

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[–] anothercatgirl@lemmy.blahaj.zone 3 points 1 month ago

the video fails to consider the effects of angle of attack on efficiency. Ideally, they would isolate the motor from the fan and measure the power in the shaft, using a torque sensor and some angular velocity data. That way, they can find an efficient fan blade and its optimal speeds separately from motor efficiency.