At 12 m diameter it would be 82000 gees, eight times the acceleration they're targeting; their render is of a roughly 100-meter-diameter chamber. At 82000 gees rotor integrity becomes probably unmanageable with existing materials. At 100 meters we're talking 420 rpm, 22 radians per second.
I don't think the launch angle needs to be precise; if it's off by 10 degrees (175 milliradians) they lose 1.6% of their altitude to cosine error. That would be an error of plus or minus 8 milliseconds, which seems about two orders of magnitude on the easy side of achievable.
I don't think the launch angle needs to be precise; if it's off by 10 degrees (175 milliradians) they lose 1.6% of their altitude to cosine error. That would be an error of plus or minus 8 milliseconds, which seems about two orders of magnitude on the easy side of achievable.