Abstract: Inflatable support structures and related systems are disclosed. An example antenna system includes a mast configured to support an antenna member. The mast includes a strength member including an inner space that extends along an axis. The strength member is changeable between a first state in which the strength member is rollable along the axis and a second state in which the strength member is rigid along the axis. The mast also includes a sleeve arranged along an outer portion of the strength member. The mast also includes a bladder disposed in the inner space of the strength member and configured to receive a fluid. The first state and the second state of the strength member are based on a fluid pressure in the bladder.

Abstract: Vacuum adapter apparatus, systems, and related methods for use with inflatable structures having relief valves are disclosed. An example vacuum adapter for a relief valve of an inflatable structure includes a first end portion adapted to connect with the relief valve, a second end portion adapted to connect with a vacuum fluid line, an intermediate portion coupled between the first and second end portions, a vacuum chamber extending through the intermediate portion between the first and second end portions such that a fluid is conveyable through the vacuum chamber from the relief valve to the vacuum fluid line, and a fluid seal positioned on the first end portion. The fluid seal is configured to engage an outlet portion of the relief valve to maintain a negative gauge pressure in the vacuum chamber that causes the relief valve to open during a deflating process of the inflatable structure.

Abstract: Inflatable support structures and related systems are disclosed. An example antenna system includes a mast configured to support an antenna member. The mast includes a strength member including an inner space that extends along an axis. The strength member is changeable between a first state in which the strength member is rollable along the axis and a second state in which the strength member is rigid along the axis. The mast also includes a sleeve arranged along an outer portion of the strength member. The mast also includes a bladder disposed in the inner space of the strength member and configured to receive a fluid. The first state and the second state of the strength member are based on a fluid pressure in the bladder.