Aspects relate to an aircraft having a controllable center of gravity and methods of controlling the center of gravity. An exemplary aircraft having a controllable center of gravity includes a first tank configured to store a first portion of a ballast, a second tank configured to store a second portion of the ballast disposed substantially aft of the first tank, at least a pipe configured to provide fluidic communication between the first tank and the second tank, at least a pump configured to pump the ballast bidirectionally between the first tank and the second tank by way of the at least a pipe, and a controller in communication with the at least a pump and configured to control a ballast ratio of the first portion of the ballast relative the second portion of the ballast and affect an aircraft center of gravity.