Roll is defined as a tilting movement from side to side about which axis?

Roll is defined as a tilting movement from side to side about which axis?

• A. Y axis
• B. Z axis
• C. X axis
• D. Vertical axis

Answer: (C)

Roll is the rotation that tilts the vessel from side to side, which happens about the axis that runs from bow to stern. That fore–aft axis is the X axis, so rolling is a rotation about the X axis. To place it in context, pitching moves the bow up and down about a side-to-side axis, and yawing rotates the vessel left or right about a vertical axis. The vertical axis would not produce a tilt, but a change of heading.

Roll is the rotation that tilts the vessel from side to side, which happens about the axis that runs from bow to stern. That fore–aft axis is the X axis, so rolling is a rotation about the X axis.

To place it in context, pitching moves the bow up and down about a side-to-side axis, and yawing rotates the vessel left or right about a vertical axis. The vertical axis would not produce a tilt, but a change of heading.