VEGA Small Launcher
Second stage (Zefiro 23)
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The Zefiro 23 is derived from a 16-tonne solid rocket motor development (Zefiro 16) initiated by Fiat-Avio, now Avio S.p.A., with company funding and contracted by the Italian space agency ASI. The Zefiro-16 motor has already completed three successful firing tests.
The Zefiro-23 motor is composed of:
a 1.9 m diameter carbon epoxy filament wound case
a low density EPDM insulation
HTPB 1912 composite propellant
a nozzle based on a flexible joint technology
a consumable igniter
an electromechanical thrust vector control system