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I know next to nothing about helicopters, but when I was a kid, I used to enjoy assembling aircraft models, and I recall this one weird helicopter model I built with interleaving rotors, spinning in opposite directions - the model was tricky to build because the rotors were attached to a gear assembly so that they had to spin together. The weird bit was that this arrangement meant that no tail rotor was required. I guess that configuration must have had some flaw in it though, as the idea hasn't been advanced further since then, far as I know.