Balloon neutral buoyancy + an interesting idea

In summary, the conversation discusses the topic of achieving neutral buoyancy with a sounding balloon, specifically in regards to the weight and helium ratio needed for the balloon to float at certain altitudes. One idea mentioned is attaching a second balloon that is mostly empty to maintain equilibrium after the first balloon bursts. Additional technical data about the balloon is also provided.
  • #1
Medula_O
1
0
Hi,
I'm trying to achieve neutral buoyancy with a sounding balloon (a large latex balloon).
Is there a certain weight/helium ratio that will make it afloat at 10km/20km etc (tyhe balloon bursting altitude is ~38km)
One idea that I had was to attach another balloon, which is mostly empty.
When the 1st, full balloon, bursts at 38km, the 2nd balloon will already be inflated to some degree (can be calculated of course).
But, what happens now ? How heigh can this 2nd balloon climb ? Can IT reach equilibrium ? Isn't this the same problem, or above that height there is something else that will limit its climb ?

More technical data on the balloon:
Launch diameter: 2.2 meters, with 4.97 cubic meters of helium.
Bursting diameter: 13 meters, at ~38km.

Thanks.
 
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  • #2
Hi Medula,
Your plan sounds feasible, but I always thought sounding balloons had a valve that opened when pressure inside exceeded a given value - that way they simply don't burst but just vent the gas when they hit a certain altitude. Similar ways of controlling volume using pressure valves or automatic valves might be employed as well, such as a solenoid valve that opens for so long then locks shut to allow the balloon to burst, or a valve that maintains pressure for so long, then opens completely to allow the package to return to Earth.
 

1. What is balloon neutral buoyancy?

Balloon neutral buoyancy is a state in which a balloon is able to float at a constant height without rising or falling. This is achieved by filling the balloon with a gas that has the same density as the surrounding air.

2. How is balloon neutral buoyancy achieved?

To achieve balloon neutral buoyancy, the balloon must be filled with a gas that has a density close to that of the surrounding air. This is typically done by filling the balloon with helium or hydrogen gas, which are both less dense than air.

3. Why is neutral buoyancy important for balloons?

Neutral buoyancy is important for balloons because it allows them to stay at a constant altitude without the need for constant input of fuel or energy. This makes them more efficient for tasks such as aerial photography, weather monitoring, and scientific research.

4. Can neutral buoyancy be adjusted in a balloon?

Yes, neutral buoyancy can be adjusted in a balloon by either adding or releasing gas from the balloon. By adding gas, the balloon becomes more buoyant and will rise. By releasing gas, the balloon becomes less buoyant and will sink. This allows for control of the balloon's altitude.

5. What is an interesting idea related to balloon neutral buoyancy?

An interesting idea related to balloon neutral buoyancy is the use of balloons for space exploration. By filling a balloon with a gas that has a density close to that of the atmosphere on Mars, the balloon can achieve neutral buoyancy and float in the Martian atmosphere. This could potentially be used for exploration and data collection on the red planet.

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