A small satellite could make rocket fuel from water for precise manoeuvres

The proposed system would split stored water into hydrogen and oxygen to control the spacecraft and help it leave orbit.

Editorial illustration — not from the study.

The Foresail-2 mission faces demanding control tasks, including keeping its spin axis pointed toward the Sun and working with a tether-assisted system to lower its orbit. These tasks are especially challenging in the spacecraft’s planned geostationary transfer orbit, where conventional propulsion systems are ineffective, according to the paper.

The researchers analyzed a Water Electrolysis Propulsion system that would produce hydrogen and oxygen from stored water. Their analysis covers the system’s design, integration and performance, and finds that it could provide high-efficiency propulsion, compact storage and lower power demands while supporting precise control and de-orbiting.

What the water system provides

The paper presents a propulsion system for Foresail-2 that electrolyses onboard water to produce hydrogen and oxygen propellants. The researchers’ analysis indicates that the system could meet the mission’s needs for attitude control, including Sun-pointing spin-axis stabilization, and for tether-assisted de-orbiting. They also report potential advantages including high specific impulse, compact propellant storage and reduced power demands, while describing the approach as consistent with emerging space-sustainability standards.

Why onboard fuel matters

A propulsion system that stores water and produces its propellants onboard could give small satellites more control over their orientation and end-of-mission orbit. For Foresail-2, that capability is relevant to operating in a geostationary transfer orbit and supporting a planned de-orbiting system. The design could also inform propulsion systems for future small-satellite missions, although this paper does not establish that the system will work in space.

Design analysis, not flight data

This is an engineering analysis of a proposed system’s architecture, integration and performance, rather than a report of an in-orbit demonstration. The abstract does not provide numerical thrust, fuel-use or manoeuvring results, nor does it state that Foresail-2 has flown or that the propulsion system has been tested in space. The findings therefore describe the system’s assessed potential for the mission, not confirmed flight performance.

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