Reusable High-Altitude Balloon Venting for Envelope Recovery
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Solution Overview
Problem
Current high-altitude balloon systems are typically used once and destroyed during descent, leading to increased costs and environmental concerns due to fragile materials and non-destructive flight termination mechanisms that fail to preserve the balloon envelope, causing litter and safety risks.
Innovation Solution
A reusable high-altitude balloon system that separates the payload from the balloon envelope, inverting it to release lift gas without damaging the envelope, allowing for controlled descent and recovery of the entire system, using stronger lightweight materials and novel flight termination mechanisms to maintain the balloon's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current flight termination mechanisms are used to initiate descent by damaging the balloon, then the balloon can be safely terminated, but the balloon envelope is destroyed and cannot be reused
Solution Approach 1:
The balloon system is divided into separable components: the payload can be detached from the balloon envelope independently. This allows the envelope to be preserved while the payload is recovered or disposed of separately, enabling reusable balloon missions.
Solution Approach 2:
Instead of destroying the entire balloon system, only the necessary components (payload) are discarded or separated, while the valuable balloon envelope is recovered and reused for subsequent missions, reducing costs and waste.
2Weight of moving object
If very thin material is used to construct the balloon envelope to reduce weight, then the overall system weight decreases, but the envelope becomes fragile and cannot survive descent and recovery
Solution Approach 1:
The patent changes the material parameters by using ultra-lightweight materials such as metallized polyethylene terephthalate (Mylar) with thicknesses of 1.25 mils or less, or even 0.75 mils. These materials maintain sufficient strength for the application while dramatically reducing weight, enabling the envelope to survive recovery and reuse.
Solution Approach 2:
The balloon envelope uses composite material structures, such as metallized films combining polymer substrates with reflective metal layers, providing both extreme lightness and adequate mechanical strength for high-altitude flight and recovery.
3Ease of manufacture
If the balloon is made from environmentally-adverse materials such as latex or rubber, then the balloon can be manufactured easily, but the materials are not recovered and create substantial litter upon termination
Solution Approach 1:
The reusable balloon design enables recovery and reuse of the envelope multiple times, dramatically reducing the amount of material waste and environmental litter compared to single-use balloons that are discarded after one flight.
Solution Approach 2:
The patent transitions from traditional latex or rubber materials to environmentally preferable ultra-lightweight metallized films, changing the material parameters to achieve both ease of manufacture and reduced environmental harm through reusability.
4Weight of moving object
If the balloon envelope is made very thin to reduce weight, then less lift gas is needed, but the envelope cannot be launched in high winds due to fragility
Solution Approach 1:
The patent changes the material parameters by using ultra-lightweight metallized films with specific strength-to-weight ratios that allow the thin envelope to withstand high-wind launch conditions while maintaining minimal weight for efficient lift gas usage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables multiple uses of the balloon system, reduces material waste, and minimizes hazards by keeping the balloon intact during descent, thus lowering recovery costs and environmental impact while maintaining operational effectiveness.
Implementation Method 1
High-altitude balloons are typically filled with helium, hydrogen, methane, or any mixture of those gasses or other gasses where the resulting mixture is lighter than air
Data Source
AI summary
An example reusable high-altitude balloon system includes a balloon with a first end supporting a payload and a second end with an aperture and an apex fitting that is positioned within the aperture. A clamp applies a pressure to a plurality of pleated folds formed in the perimeter of the aperture around the apex fitting to form an air-tight seal against the balloon at the perimeter of the aperture. The reusable high-altitude balloon system further includes control circuitry that controllably releases the apex fitting from the balloon to initiate a descent sequence.