Griffon's first inversion is called the Immelmann Loop. The maneuver is named after World War I German fighter pilot Max Immelmann. Trains pass under the bridge, pull up into a half loop, and finally perform a half twist. I am a pilot, so I must point out that this is technically not the correct name for this type of action. When flying aerobatics, an Immelmann has the plane traveling horizontally during the half twist, but Griffon's twist occurs during a rather steep descent. This drop makes the loop very similar to a half of a "Cuban 8" aerobatic maneuver where the half roll occurs as the plane descends at about a 45° angle.
©2018 by Joel A. Rogers.