>different pitches of the blades above and below the divider I thought that was interesting, so I looked for it on the video: https://youtu.be/IY0gRMpT4AY?t=87

>different pitches of the blades above and below the divider I thought that was interesting, so I looked for it on the video: https://youtu.be/IY0gRMpT4AY?t=878 https://youtu.be/IY0gRMpT4AY?t=878 If there's a difference in blade pitch, it's not visible from that angle. What is pretty clear is that the split isn't exactly halfway down, maybe 55/45 instead of 50/50. Their marketing photos aren't any clearer: https://pbs.twimg.com/media/FNa32k2XoAMCDiW?format=jpg&name=large https://pbs.twimg.com/media/FNa32k2XoAMCDiW?format=jpg&name=... You would probably need to cut an impeller up to see a difference, or xray it. I would also be interested if someone swaps out the blowers and see what difference the Apple impeller makes. I would be surprised if it's more than 5%. But injection molding makes fancy geometries very cheap, and if you're making the molds anyway you might as well pick up the easy design win. Amortized over however many millions they're going to make, the NRE costs are going to be pennies per unit.