Reaction Motors XLR10 Viking rocket engine
Reaction Motors' XLR10 Viking was a historical liquid rocket engine that NASA records at approximately 20,000 lbf sea-level thrust using liquid oxygen and alcohol. NASA's X-15 history states that Reaction Motors abandoned further XLR10 development in favor of the more powerful XLR30 ‘Super Viking’ derivative; the XLR10 was not throttleable or restartable in flight and was not man-rated.
Identity
- Aliases
- XLR10XLR-10Viking engine
- Domains
- aviationspaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- Reaction Motors XLR10 Viking rocket engine
- Status
- retired
Details
- Description
- Reaction Motors' XLR10 Viking was a historical liquid rocket engine that NASA records at approximately 20,000 lbf sea-level thrust using liquid oxygen and alcohol. NASA's X-15 history states that Reaction Motors abandoned further XLR10 development in favor of the more powerful XLR30 ‘Super Viking’ derivative; the XLR10 was not throttleable or restartable in flight and was not man-rated.
- Propellants
- liquid oxygenalcohol
- Rocket Specs
- Restartable
- No
- Sea Level Thrust Kn
- 88.96489
Links
Assets & Meta
- Creation Time
- August 15, 2026 at 03:33:44 UTC
- Updated Time
- August 15, 2026 at 03:33:44 UTC
Other
- Sources
- Accessed Date
- 2026-08-14
- Note
- NASA's X-15 history identifies the Reaction Motors XLR10 Viking engine, approximately 20,000-lbf sea-level thrust on liquid oxygen and alcohol, and its abandonment in favor of the more powerful XLR30 Super Viking derivative; it also records the lack of in-flight throttle/restart and man-rating.
- Publisher
- NASA
- Title
- X-15: Extending the Frontiers of Flight
- Accessed Date
- 2026-08-14
- Note
- NASA's aerospace-history monograph places XLR10 among the candidate engines considered for Project 1226/X-15 and distinguishes its Viking heritage from the later XLR30/XLR99 path.
- Publisher
- NASA Technical Reports Server
- Title
- Hypersonics Before the Shuttle