Under which condition is maximum headway in an airship achievable?

Maximum headway in an airship is achievable when it is flying in equilibrium. This condition means that the upward buoyant force is perfectly balanced by the downward forces, including weight and any drag forces acting against the airship. When an airship is in equilibrium, it operates most efficiently, allowing for optimal use of its available lift and propulsion systems.

In this state, the airship can achieve the best forward motion because it is not spending excess energy either trying to climb or descend, which could result in increased drag or reduced speed. Conversely, when the engines are at full throttle, the airship may not be in equilibrium, enjoying maximum thrust without achieving maximum headway. A controlled descent or the removal of all ballast might not provide the ideal conditions necessary for achieving the best glide performance and maneuverability, as these scenarios could lead to increases in descent rate or changes in lift dynamics, affecting overall headway.