The Zefiro-40 solid rocket motor, the second stage of the Vega-C rocket, was tested today by Vega-C prime contractor Avio at its Salto di Quirra test facility in Sardinia, Italy. The motor features an improved engine nozzle design, required to prepare for a Vega-C return-to-flight by the end of 2024. The Zefiro-40 solid rocket motor, the second stage of the Vega-C rocket, was tested today by Vega-C prime contractor Avio at its Salto di Quirra test facility in Sardinia, Italy. The motor features an improved engine nozzle design, required to prepare for a Vega-C return-to-flight by the end of 2024. Space Exploration Phys.org – latest science and technology news stories