ATK will provide the Castor 30XL, an upgraded second-stage motor for Orbital Science’s Taurus II commercial launch vehicle, under a $57m contract.

The Castor 30XL is a larger and higher-performance solid rocket motor with greater payload capability compared to the present Castor 30A, used on the current configuration of the Taurus II.

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The Castor 30XL will be used after the first four flights of Taurus II are run on Castor 30A and Castor 30B.

Taurus II medium-class launch vehicle is due to conduct commercial cargo resupply missions to the International Space Station (ISS) for Nasa.