Viking 4
Snecma Moteurs Viking 4 is a storable-propellant nitrogen-tetroxide/UH25 liquid rocket engine used as the single Ariane second-stage engine. ESA reports 798 kN thrust and 125 s burn time per engine; Viking 4 was used across the Ariane 1, Ariane 2, Ariane 3, and Ariane 4 core configurations, and this model is retired.
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
- Snecma Moteurs Viking 4 is a storable-propellant nitrogen-tetroxide/UH25 liquid rocket engine used as the single Ariane second-stage engine. ESA reports 798 kN thrust and 125 s burn time per engine; Viking 4 was used across the Ariane 1, Ariane 2, Ariane 3, and Ariane 4 core configurations, and this model is retired.
- First Flight Date
- 1979-12-24
- Propellants
- nitrogen tetroxideUH25
- Rocket Specs
- Burn Time S
- 125
- Sea Level Thrust Kn
- 798
Links
Assets & Meta
- Creation Time
- August 1, 2026 at 08:31:02 UTC
- Updated Time
- August 22, 2026 at 08:02:38 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