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Zefiro 9

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Status: In production. Thrust: 313.00 kN (70,365 lbf). Gross mass: 11,100 kg (24,400 lb). Unfuelled mass: 1,000 kg (2,200 lb). Specific impulse: 294 s. Burn time: 117 s. Height: 1.74 m (5.70 ft). Diameter: 1.90 m (6.20 ft).

The Zefiro 9 was derived from a 16-metric ton 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 had already completed three successful firing tests by the end of 2006. The Zefiro-9 motor features included: 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; and an electromechanical thrust vector control system.

Chamber Pressure: 74.00 bar. Area Ratio: 56. Propellant Formulation: HTPB 1912.