[5] After a critical design review based on the completed first test firings,[6] the second test-firing of the Zefiro 9 took place at Salto di Quirra on 28 March 2007.

Telemetry data showed the Vega rocket achieved a top speed of approximately 2.17 km/s, 233 seconds into flight.

The rocket then deviated below its planned ascent trajectory before falling into the Atlantic Ocean north of the Centre Spatial Guyanais.

[14] The propellant of all Zefiro models is HTPB 1912 with a nominal composition of 19% of aluminium powder, 69% of ammonium perchlorate with 12% of hydroxyl-terminated polybutadiene binder.

Both motors have a 1.9 m diameter carbon epoxy filament wound case, a low density EPDM insulation, a flexible rocket nozzle joint and an electromechanical thrust vector control system.

In comparison to its predecessor Zefiro 23, the motor has an increased exercise pression, better structural load margins for both the casing and the propellant grains and an improved flexible rocket nozzle joint.