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GateKeeper

After a train is released from the chain lift, it rolls 180° to the right and drops 164 feet in a half loop.  The maneuver is called a "Wing Over Drop." The second maneuver is the "Immelmann Loop" where trains perform a half loop followed by a descending 180° roll.  Max Immelmann was a German pilot during World War I and developed the maneuver as a way to quickly create a 180° change of direction.

Wing Over Drop and Immelmann Loop on a roller coaster

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