RFA’s own kerosene-fuelled Helix engines. The first stage has nine engines, while the second stage has one. Claimed to be able to lift 1,300 kilograms to a 500-kilometer Sun-synchronous orbit, the booster comes with the Redshift Orbital Transfer Vehicle (OTV), which functions as a kick-stage and on-orbit services spacecraft.

Ah, so it’s a bigger version of Electron. Looks awesome!