Viking 4
Viking 4 is Snecma Moteurs’ storable-propellant liquid rocket engine for the Ariane second stage. ESA’s Ariane 4 reference identifies a single Viking 4 using nitrogen tetroxide and UH25, with 798 kN engine thrust and a 125-second stage firing. That upper-stage figure describes the named Ariane 4 installation; it should be read separately from the first-stage Viking 5 and liquid-booster Viking 6 ratings. The Ariane 4 vehicle family completed service in 2003.
Identity
- Aliases
- Viking 4Viking-4Snecma Viking 4Ariane second-stage Viking 4
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- Viking 4
- Status
- retired
Details
- Description
- Viking 4 is Snecma Moteurs’ storable-propellant liquid rocket engine for the Ariane second stage. ESA’s Ariane 4 reference identifies a single Viking 4 using nitrogen tetroxide and UH25, with 798 kN engine thrust and a 125-second stage firing. That upper-stage figure describes the named Ariane 4 installation; it should be read separately from the first-stage Viking 5 and liquid-booster Viking 6 ratings. The Ariane 4 vehicle family completed service in 2003.
- First Flight Date
- 1979-12-24
- Propellants
- nitrogen tetroxideUH25
- Rocket Specs
- Burn Time
- …
Links
Assets & Meta
- Creation Time
- August 1, 2026 at 08:31:02 UTC
- Updated Time
- October 29, 2026 at 15:26:36 UTC
Other
- Sources
- Accessed Date
- 2026-08-01
- Note
- ESA identifies a single Viking 4 engine on Ariane 4 stage 2 and documents the NTO/UH25 propellant combination.
- Publisher
- European Space Agency
- Title
- Achievements: Ariane 4 principal characteristics
- Accessed Date
- 2026-08-01
- Note
- ArianeGroup distinguishes Ariane 4's six configurations and the 40 baseline without strap-on boosters.
- Publisher
- ArianeGroup
- Title
- Ariane 4, a real success story for technology and industry
- Accessed Date
- 2026-08-15
- Note
- ESA records Ariane 1's successful maiden flight on 24 December 1979; Viking 4 is the canonical second-stage engine identity used in the Ariane core.
- Publisher
- European Space Agency
- Title
- History: Ariane L01, 1979
- Accessed Date
- 2026-10-29
- Note
- Ariane 4 stage-2 description: one Snecma Moteurs Viking 4, 798 kN thrust, 125 s firing and NTO/UH25 propellants; the reference gives stage context without labelling this as a sea-level engine rating.
- Publisher
- European Space Agency
- Title
- ESA Achievements — Ariane 4