LTA vehicles are broadly categorized into unpowered and powered versions:
: Unpowered aerostats that drift with the wind or are tethered in place. Pilots primarily control altitude by adjusting the gas temperature or releasing ballast. lighter-than-air craft
: Rely entirely on internal gas pressure to maintain their shape. LTA vehicles are broadly categorized into unpowered and
: Feature an internal structural framework that holds the gas cells and maintains the ship's shape regardless of gas pressure. lighter-than-air craft
The choice of gas determines the lift capacity and safety profile of the craft:
: Use a partial keel or frame to support the envelope and distribute weight. 2. Lifting Agents