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Looks a very interesting project and attempt! It seems in the final videos that the rotation of the two arms for the blades is not in unison - is this deliberate?

Obviously on a Chinook helicopter the blades can be individually angled, and this quad design is like having 2 Chinooks tied together. Would it benefit from the mount of the rotors on each arm being hinged to keep the blades in unison per arm, or would a stiffer central arm connecting both sets of 2 blades more aligned to each other help?

I honestly don't know - just an observation from someone with zero knowledge but looks very interesting.

very cool! awesome website they put together for the challenge as well, all of the different designs are fascinating.