The bamboo-copter was originally conceived by the engineer of what nationality?
Bamboo-copter The bamboo-copter, also known as the bamboo dragonfly or Chinese top (Chinese "zhuqingting" 竹蜻蜓 , Japanese "taketombo" 竹蜻蛉 ), is a toy helicopter rotor that flies up when its shaft is rapidly spun. This helicopter-like top originated in Warring States period China around 400 BCE, and was the object of early experiments by George Cayley, the inventor of modern aeronautics.
Eben Ernest Hayes Eben Ernest Hayes (Ernest Hayes) (1851–1933) was a New Zealand engineer and inventor who founded the Hayes Engineering works in Oturehua, Central Otago. He developed a wind turbine and manufactured wind pumps and agricultural tools for farms.