WaterCube Propulsion System

WaterCube is a low pressure propulsion system that uses demineralised water as propellant. It is designed for CubeSats and microsatellites up to 500 kg, and for missions where safety, fast delivery and simple integration matter.

WaterCube supports orbit maintenance, collision avoidance, formation flying, proximity operations and active deorbiting. Since the propellant is water, it is non-toxic and stored at low pressure, allowing also for 3d printing manufacturing. That removes the hazardous handling and the complex safety reviews of conventional systems, so ground integration and testing are up to 50% simpler and faster.

The system combines metal additive manufacturing with our proprietary heat-exchanger technology. This allows a compact, modular design that can be sized to each mission's thrust and impulse needs, at up to 50% lower cost than traditional solutions. Its plug-and-play architecture shortens integration, and a fully European supply chain lets us deliver in under 14 weeks.

WaterCube has reached TRL 7 and was selected for an EU in-orbit demonstration opportunity. Its first in-orbit demonstration is planned for Q1 2027 under ESA supervision. Customers can use OrbitRev, our propulsion digital twin, to size and validate WaterCube for their mission during design. Missions that need higher performance can move up to WaterCube+, planned for market launch in Q2 2028.

More information: https://www.capsule-space.biz/