AEROSTATS are lighter than air models. We have two main types of aerostats: Hot air balloons and Airships. Airships obtain their sustentation from gas (or from hot air), have propulsion units and can be directed.

Next, we have three types of airships:

1. Blimps have an inflatable envelope and their shape is obtain by the pressure of the gas inside the envelope. Blimps are the most common airship models and the easiest to build
2. Hot air airships obtain their lift from hot air produced in an inflatable envelope
3. Rigid airships have a covered rigid structure and contain inflatable gas balloons.

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