Abstract: A Rapid Air Ballast System that generates ballast for an airship relatively quickly by compressing air at low pressures into a ballonet inside a large volume tank. The air pressure inside the ballonet being roughly equal to the lifting gas pressure outside the ballonet but inside the tank. The system comprising a controllable air compression device to achieve the desired air pressure and valves in the system to direct the flow of air into or out of the system. This is particularly useful for quickly and efficiently controlling aerostatic lift for an airship, especially while performing on-loading and off-loading of payload operations.