The selected ‘Multi P linear’ concept for the Ariane 6 is based on a lower ‘composite’ of four motors, each loaded with around 135 tonnes of solid propellant, providing also synergies with the Vega evolution perspectives. An "in-line" arrangement of three will serve as the first stage, while the fourth will be mounted above as the second stage. The third stage will be an adapted version of the Ariane 5 ME upper stage, equipped with the Vinci engine and specific propellant tanks. The 5.4 m-diameter payload fairing will be able to accommodate the same volume of satellites as Ariane 5.