Coralie rocket stage engine (Europa rocket)
The program ultimately traces its history to the British Blue Streak missile, which was cancelled in 1960. Blue Streak was then used as the basis of the Black Prince expendable launch system and several other concepts. Looking for partners to share development costs, ELDO was formed and began development of the Europa using the Blue Streak first stage along with the French-built Coralie second stage and German Astris upper stage.
