High-Altitude Balloon Venting for Reusable Flight Termination
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Solution Overview
Problem
Current high-altitude balloon systems are not reusable, leading to increased costs and environmental concerns due to the destruction of fragile balloon envelopes and the separation of payload and carcass during flight termination, which results in litter and safety hazards.
Innovation Solution
A reusable high-altitude balloon system that separates the payload from the balloon envelope, causing the balloon to invert and release lift gas without damaging the envelope, allowing for controlled descent and recovery of the entire system.
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 envelope is destroyed, but this increases costs and decreases viability of routine data collection operations
Solution Approach 1:
The patent implements a flight termination mechanism that releases lift gas through a vent duct instead of destroying the balloon envelope, enabling recovery and reuse of the balloon system. The payload separates from the balloon, the balloon inverts to vent lift gas, and both components are recovered intact for subsequent flights, transforming a disposable system into a reusable one.
2Weight of moving object
If balloon envelopes are constructed from very thin material to reduce weight, then the overall system weight decreases, but the envelope becomes very fragile and cannot survive descent and recovery
Solution Approach 1:
The patent inverts the balloon envelope during descent and recovery instead of destroying it. The inversion process allows the thin fragile material to be protected from damage during landing, enabling the envelope to survive recovery and be reused. This transforms the terminal event from destruction to a controlled inversion that preserves the envelope integrity.
3Weight of moving object
If thin fragile material is used for the balloon envelope, then the balloon can be launched with reduced weight, but high winds can damage or tear the envelope at launch
Solution Approach 1:
The patent enables recovery of the thin fragile envelope after flight, allowing it to be reused for subsequent launches. The flight termination mechanism protects the envelope from destruction, and the inversion process preserves the material, transforming a single-use fragile envelope into a reusable component that can withstand multiple launch cycles.
4Reliability
If payload and balloon carcass separate during flight termination, then descent can be initiated, but this increases costs of recovery efforts and increases risks to the public due to multiple objects falling
Solution Approach 1:
The vent duct serves multiple functions: it arrests balloon ascent during normal operation by controlling lift gas release, and it serves as the release path for lift gas during flight termination to enable descent. This multi-functionality eliminates the need for separate destruction mechanisms, allowing the balloon to descend and be recovered intact without creating safety hazards from fragmented debris.
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 the reuse of balloon systems, reduces environmental impact by preventing litter, and enhances safety by ensuring all components land together, thereby minimizing hazards and resource strain.
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 control system configured to initiate a termination sequence by separating a payload from an Earth-facing end of the balloon body. Separation of the payload from the balloon body generates a torque that causes the balloon body to invert and release lift gas through a vent duct, initiating a flight termination sequence that facilitates landing of the reusable balloon system without destroying the balloon body.