1941/45 - Bell's Helicopter Prototypes (with Creepy Accident!)

Various model of helicopter prototypes conceived by Lawrence Dale Bell in the US from 1941 to 1945, including shots of a chilling accident happened to a test pilot during a take off attempt. He was wearing no helmet and no seat belts, so he was very lucky to survive with a broken shoulder and arm. The rotor could have been hitting the neck instead of the shoulder and he would certainly had his head cutted off...