Introduction Access to space relies almost entirely on chemical propulsion, which is costly, polluting, and constrained by the mass paradox: much of the fuel serves only to lift itself. To overcome these limitations, alternative methods are needed. Among them, space elevators or electromagnetic launchers are studied, but they remain highly complex. This project explores a hybrid approach: a segmented atmospheric column using buoyancy and linear electric propulsion.

Proposed Concept The structure consists of a lightweight cable divided into 35-meter segments, each supported by a balloon. Helium is used in lower altitudes where oxygen concentration makes hydrogen risky, then hydrogen is used in upper layers to reduce weight and cost. Each module includes:

• A lift balloon adapted to ambient pressure

• Flexible solar panels for power supply

• A linear electric propulsion system controlled locally

The payload accelerates gradually along the column until it reaches sufficient speed for low Earth orbit insertion or recovery at high altitude.

Preliminary Analysis A simple model estimates the gas volume needed for a 50-km vertical column. Assuming a cable with linear density of 10 g/m and balloon spacing between 5–50 m, the lift factor decreases exponentially with altitude: F(h) ≈ e^(-h/8000) Optimal spacing around 35 m minimizes the required gas volume. The system requires ~41 million liters of helium or ~37 million liters of hydrogen for the cable alone. Using helium at low altitudes and hydrogen at high altitudes can save 10–15% total volume and cost.

Advantages, Challenges, and Limitations Advantages:

• Significant reduction of fossil fuel use

• Modular design with redundancy

• Renewable solar power

• Gradual load distribution reduces mechanical stress

Challenges:

• Lateral wind resistance

• Cascading failures if segments lose lift

• Complex trajectory control

• Compact, reliable linear propulsion technology

Further research is needed on dynamic behavior, thermal effects, and aerodynamic interactions.

Future Perspectives and Applications

• Partial or full nanosatellite launches

• Transporting scientific instruments to the stratosphere

• Testing space technologies (engines, shields) at altitude

• Airborne communication relays

• A base for electromagnetic stage launch from high altitude

Conclusion This segmented atmospheric launch column concept offers a potentially revolutionary approach to space access. Modular design, renewable energy, and gradual ascent could democratize space access and reduce environmental impact. A small-scale prototype would be the first step toward validation.