Viking rocket engine family

Historical European Viking liquid-rocket-engine family used across Ariane 1–4. ESA records the Snecma Moteurs Viking 5 as Ariane 4's first-stage engine, with four engines delivering about 2,720 kN total launch thrust for up to 205 seconds; the family used nitrogen tetroxide and UH25 hypergolic propellants. This family record does not assert a canonical actor edge or a specific vehicle configuration until those identities are separately reconciled.