P80 (rocket stage)
The P80FW is a retired solid-fuel rocket motor developed as the first stage of the Vega launch vehicle. It was developed by Europropulsion, a joint venture between Avio and ArianeGroup, for the European Space Agency. The designation "P80FW" reflects the key characteristics of the motor: "P" stands for poudre, referencing its solid propellant; "80" denotes the original target of 80 tonnes of propellant ; and "FW" for filament wound, indicating the one-piece carbon-fibre composite construction of the motor casing. Prior to its retirement, it was the world's most powerful monolithic solid rocket motor.
History
Development of the P80 began in 2005 led by the French space agency CNES, in collaboration with the ESA and the Italian Space Agency. The first static firing test was conducted at the Guiana Space Centre in November 2006, followed by qualification testing in December 2007. The P80 made its maiden flight on 13 February 2012 as part of Vega's qualification mission, followed by its first commercial launch on 7 May 2013. Total development costs amounted to €76 million.The P80 was retired after completing 22 successful launches, with its final flight occurring on 5 September 2024.
It was succeeded by the P120C, a wider and more powerful variant with a propellant mass of, developed for use on both the Ariane 6 launch vehicle and the upgraded Vega C rocket.
, an extended version of the P120C, known as the P160C, was under development. This version is approximately longer and features a propellant mass of. It is intended for use on the Ariane 6 Block 2 and as the first stage of the future Vega E.
Technical overview
The P80FW was a monolithic solid rocket motor that used an ammonium perchlorate composite propellant known as HTPB 1912, consisting of approximately 69% ammonium perchlorate, 19% aluminum powder, and 12% hydroxyl-terminated polybutadiene as the binder. It burned for approximately 114 seconds and was jettisoned at an altitude of, at which point the launch vehicle reached a velocity of about.The motor shared dimensions with the solid rocket boosters used on the Ariane 5, featuring a diameter and a similar height of. This compatibility allowed use of the same facilities at the Guiana Space Centre propellant loading and transportation. The P80 nozzle was derived from that of the Ariane 5 boosters.
When fully fueled, the P80FW had a gross mass of including approximately of propellant. Before propellant loading, the booster weighed approximately, which includes the weight of the motor casing. It delivered a maximum thrust of and an average thrust of with a specific impulse of.
Manufacturing and integration of the P80 involved multiple European aerospace companies. Europropulsion manufactured the main motor casing, Regulus was responsible for propellant loading, Aerospace Propulsion Products of the Netherlands built the igniter, Belgian company SABCA supplied components for thrust vector control and the staging skirt, ArianeGroup manufactured the nozzle and Avio handled integration of all the components and conducted final testing.