https://m.youtube.com/watch?v=-gKGNzCNSYA
(https://m.youtube.com/watch?v=-gKGNzCNSYAWhy)
Why possible. ?
No start inertia
https://www.google.com/search?q=start+inertia&ie=utf-8&oe=utf-8&client=firefox-b-m#spf=1566305815108 (https://www.google.com/search?q=start+inertia&ie=utf-8&oe=utf-8&client=firefox-b-m#spf=1566305815108)
energy velocity and generation without " start inertia- moment"- resistance