Fan is the characteristic of the flexible chute to flex around the short side of the chute where the base of the round rides. Fan allows for offset gun and ammunition box configurations to control the ammunition flow.
Twist is the characteristic of the flexible chute to rotate along its central axis 180 degrees in the most minimal distance. Twist allows for the extreme positive and negative gun elevations.
Bend is the characteristic of the flexible chute to flex around the long side of the chute where the side of the round or link rides. Bend allows for a smooth path in tight space gun and ammunition box connections.