An incredible concept .( called SpinLaunch) Creating a vacuum inside the structure enables the rocket to achieve high velocity ,an incredible velocity of 5 thousand miles per hour due to 0 air resistance,before it is launched . Prototype has been built and worked as planed . A larger one will be built in the near future . This is highly desirable way to launch spacecraft due to the fact that rockets are mostly fuel by weight this eliminates any fuel.
An amazing idea, hopefully they will succeed in future builds .
I will be happy if it works, but at this time am skeptical. I can’t come up with a release mechanism that will stop the rotation of the payload. But then, no one is paying me to work on it.