3,700 feet, or about three-quarters of a mile, does not seem like a very long distance except it can feel like an eternity when you are spinning around seven inversions at a top speed of 67 mph. When your train drops 110 feet on the Incredible Hulk roller coaster at Islands of Adventure, you experience a g-force of 4. To put that into perspective, the Space Shuttle only has 3 g when plunging back to earth.