Assuming you can 1) accelerate fast enough to penetrate the atmosphere at high speeds (and remember, the faster you travel, the air resistance is the square of

Assuming you can 1) accelerate fast enough to penetrate the atmosphere at high speeds (and remember, the faster you travel, the air resistance is the square of your velocity). 2) withstand the crazy max-q as soon as you leave the spiral (which I assume is vacuumed). 3) make the centrifugal forces reasonable during the acceleration The article mentions acceleration to 5000mph, which would be enough if there was no atmosphere, but I highly doubt it will work with.