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

  • Another Catgirl@lemmy.blahaj.zoneEnglish
    3·
    11 days 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.