In article ,
says...

"SpinLaunch is raising $30 million to use large centrifuges to power catapult to
launch payloads into space. They use large centrifuges to store energy and will
then rapidly transfer that momentum into a catapult to send a payload to space at
up to 4,800 kilometers per hour (3,000 mph). If successful, the acceleration
architecture is projected to be both lower cost and use much less power, with the
price of a single space launch reduced to under US$500,000."

See:

https://www.nextbigfuture.com/2018/0...er-launch.html


Feasible?

Maybe. But quite challenging. At the high acceleration required by
this approach, the projectile must be fairly hardened. Also, at the
high low altitude speeds this thing will be traveling, atmospheric
heating is an issue. And finally, even if the catapult can get it to
orbital altitude and velocity, it will never get into orbit without a
rocket engine to circularize the orbit.

From the projectile's point of view, this isn't much different than the
past "gun launch" proposals. Pretty much all of the same issues apply.

Jeff
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