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Model: Zefiro 23. Gross Mass: 26,900 kg (59,300 lb). Empty Mass: 3,000 kg (6,600 lb). Thrust (vac): 1,200.000 kN (269,700 lbf). Isp: 289 sec. Burn time: 72 sec. Propellants: Solid. Propellant Formulation: HTPB 1912. Diameter: 1.90 m (6.20 ft). Span: 1.90 m (6.20 ft). Length: 7.50 m (24.60 ft). Country: Italy. No Engines: 1. Motor: Zefiro 23. Status: In production.

The Zefiro 23 was 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 had already completed three successful firing tests by the end of 2006. The Zefiro-23 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.



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