Is a Helicopter a Good Idea?

Leonardo da Vinci designed many flying machines, none of which would have worked. He also had various flapping versions where the man in the harness was supposed to flap his arms and obviously trying to mimic a bird. It turned out to be the wrong answer. You can't do it by mimicking a bird. You have to start from scratch. Even if his machine had got off the ground, it would have just spun around and around and around. The motive power for that was four men with a capstone running right and right andright and right on a runway. Of course, muscle power couldn't possibly generate enough power to lift themselves. But also it had no stabilizing what