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maybe at that time they were trying to find a way to fly. its not an uncommon thing, humans always had the dream of flight. it is the one thing we can't do, we can walk and swim but not fly. and just because they were living in ancient times doesn't mean that they hadn't come to terms with the fact that a single person can never fly on their own without aid. and that wings are necessary to fly. the helicopter idea isn't all that advanced either, all you have to do is observe the way a maple seed floats down to figure out that a rotating fin can produce lift.
these are all simple concepts and with the human capability of abstract thought anyone could take the design of a bird and combine it with a maple seed concept and think it would work. however they just didn't have materials or a way to power something like that. so it must have remained a concept until everyone who understood it died out.
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