Board Thread:General Discussion/@comment-4196571-20140218232552/@comment-12664470-20140219010659

I did a quick Free Flight, here are my findings:

From wall to wall, directly over the center of the circle, it takes 28 seconds at 228 miles per hour (standard speed in the X-02) which factors out to a diameter of approximately 1.78 miles. The turrets themselves take about 2 seconds to pass by, which brings their length (I have no data on their height or width) at about 668 feet.

These numbers are calculated by straight flights at 228mph, though there were slight altitude differentials (about 10-20 feet per flyover of the entire facility and ~50 feet when flying past the turrets themselves.) This is further complicated by the fact that the turrets still swivel in free flight.

Note that since Stonehenge is a gunpowder/railgun hybrid, the math may end up being slightly different. A pure railgun system would likely requre a turret several times larger than Stonehenge.