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The file contains a simple model and a refined model. And multiple formats.A traditional Chinese flying toy made of bamboo. When spun rapidly between the palms, its propeller-like blades lift into the air, mimicking a proto-helicopter. Historically dating back to the Han Dynasty (202 BCE–220 CE), this simple yet ingenious device inspired early concepts of vertical flight, later influencing inventors like Leonardo da Vinci. Combines folk craftsmanship with aerodynamic principles.