The Spacemast Deployment System

Abstract

SpaceMast is a novel modular deployable mast system that enables realization of several different space applications such as instrument booms, drag sails or solar arrays with the same base technology. The fundamental component of the SpaceMast system is a rollable, tubular mast with a double-omega cross-section that is made of a carbon fiber composite material. Due to its cross-sectional shape, low wall thickness and flexible material the mast can be compressed to a flat band and rolled up on a spool. Thereby, even long masts are brought into a compact form that occupies minimal volume during space transport. SpaceMast is a modular design that is composed of a central module consisting of the storage spool and the drive mechanism and – depending on its application – one to four mast modules attached to it. While the central module contains the stowed mast (or masts) and provides the deployment force, the mast module guides the boom off the spool and gives structural support during its transition from the flattened to the deployed state. A main component of the mast module is the patented Floating-Core-Interface (FCI). This interface provides a stable and rigid connection between the mast and the deployment system. It consists of a shell that encloses the mast from the outside and a core that gives support from the inside. Between both there is only a small gap for the mast shell to slide though thus preventing the shell to deform under load. Thereby, the bending stiffness is increased and the strength of the mast is almost doubled. Another feature is the ability to retract the mast. Thereby, the mast can be extended to specific lengths several times and the system can also be fully retracted again. The modular design allows the realization of a variety of different applications with the same deployment system. Applications comprise instrument booms, drag sails, solar sails, sun shades, single and double wing solar arrays and dipole antennas. The system can be used in space or on planetary surfaces such as Moon or Mars. Currently an in-orbit demonstration mission scheduled for launch in early 2026 is under preparation. The application is a camera mast that will take images of the OTV. The system includes an integrated, deployable harness to enable power supply of the cameras that are mounted at the mast tip. Data cables will transfer the images back to the host spacecraft. Development tests including functional tests, shaker and thermal chamber have been successfully passed. Final tests of the Flight Model are scheduled for May_June 2025.