竹蜻蜓我小时候玩过,我记得桨片是木头削制的,轴则是一根竹筷子。维基百科说竹蜻蜓起源于中国,早在春秋战国时代就出现了。

据说竹蜻蜓启发了直升机的发明。
有一篇韩国人的研究文章,分析竹蜻蜓的空气动力学:
https://www.researchgate.net/profile/Na ... lyZWN0In19
1895 年,开尔文勋爵说:“重于空气的飞行器是不可能的”(澳大利亚物理学会)。
In 1895, Lord Kelvin said "heavier-than-air flying machines are impossible" (Australian Institute of Physics), followed by his 1896 statement, "I have not the smallest molecule of faith in aerial navigation other than ballooning...I would not care to be a member of the Aeronautical Society."
https://scienceworld.wolfram.com/biography/Kelvin.html
开尔文勋爵可能没见过中国的竹蜻蜓玩具,否则他就不会那样讲了。