Encyclopedia Astronautica
Zefiro 9


Fiat-Avio solid rocket engine. 313 kN. In production. Isp=294s. Motor derived from the 16-metric-ton Zefiro 16. Carbon epoxy filament wound case; low density EPDM insulation; HTPB 1912 composite propellant.

The Zefiro 9 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-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.

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

More... - Chronology...


Associated Countries
See also
Associated Launch Vehicles
  • Vega Primarily Italian all-solid propellant launch vehicle. After years of furious debate, a $173 million development program began, 52% funded by Italy and 34% by France. As of the first firing of the P80 first stage motor at the end of 2006, first flight had slipped into 2008 from a 2007 original planned date. More...

Associated Manufacturers and Agencies
Associated Propellants
  • Solid Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. More...

Associated Stages
  • Zefiro 9 Solid propellant rocket stage. Loaded/empty mass 11,100/1,000 kg. Thrust 313.00 kN. Vacuum specific impulse 294 seconds. The Zefiro 9 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. More...

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