https://makezine.com/article/science/energy/centuries-of-cranks-vindicated-by-h/
Centuries of cranks vindicated by human-powered ornithopter flight - Make:
Sep 24, 2010 - Although the Snowbird, made of carbon fiber and balsa wood and with a 105-foot wingspan, could hardly be described as "practical," to me this seems like a...
human powered ornithoptercenturiescranksvindicatedflight