I remember going through a fascination with rubber band powered paper/balsa ones in childhood, they were very light and fragile. People tried to scale it at the

I remember going through a fascination with rubber band powered paper/balsa ones in childhood, they were very light and fragile. People tried to scale it at the time helicopters were first practical https://ornithopter.org/history.rubber.shtml https://ornithopter.org/history.rubber.shtml