« Back to Dictionary Index
A ballonet is indeed an air compartment within the envelope of an aerostat, typically a balloon or airship. Its primary function is to accommodate changes in the volume of the lifting gas (such as helium or hydrogen) due to variations in temperature and atmospheric pressure. Here are a few key points about ballonets:
- Purpose: Ballonets help maintain the shape and buoyancy of the aerostat by adjusting the volume of the lifting gas. They allow for controlled expansion and contraction of the lifting gas in response to external factors like temperature changes.
- Construction: Usually made of airtight fabric or a similar material, ballonets are separate compartments within the main envelope of the aerostat. They are connected to a valve system that allows air to be pumped in or released as needed.
- Functionality: When the aerostat ascends, the lifting gas expands. Excess gas is vented into the ballonet, preventing the envelope from bursting. Conversely, during descent or when the gas cools, the ballonet can be inflated with air to maintain pressure and shape.
- Types: Depending on the design of the aerostat, there may be multiple ballonets distributed throughout the envelope. Each ballonet is typically controlled independently to optimize the aerostat’s flight characteristics.
Ballonets are crucial for the safe and efficient operation of aerostats, allowing them to navigate various altitudes and environmental conditions while maintaining stability and buoyancy.
« Back to Dictionary Index