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The use of mechanical tethers for momentum transfer is a space-proven conceptandleadstomanypossibleapplications. Onesuchapplicationis launch-assist. By tethering a payload to a reaction mass and executing a controlled deployment and tether-cut, the momentum of the reaction mass can be sacri¦ced to obtain a boost for the payload. In this way, after a launcherhas deliveredits payloadto alow elliptic orbit,a tether deployment can be used to circularize the payload and simultaneously de-orbit the spent stage. This paper discusses the results of the design study and hardware testing of the deployment.

A tethered upper stage for small launchers − preliminary analysis, design, and test