ABL E2 engine family
ABL Space Systems' E2 is a Jet-A/liquid-oxygen gas-generator-cycle family with a single-shaft turbopump for RS1. ABL identifies three configurations: E2 Vacuum for stage 2, E2 Sea Level Radial for stage 1, and a double-chamber E2 Sea Level Center variant; each is described as producing more than 16,000 lbf of vacuum thrust. This family is retained as historical because ABL exited the commercial launch market and shifted focus to missile defense; the record describes the E2 family, not RS1.
Identity
- Aliases
- E2 engineABL E2
- Domains
- spaceflight
- Identity Level
- family
- Kind
- liquid-rocket-engine
- Name
- ABL E2 engine family
- Status
- historical
Details
- Description
- ABL Space Systems' E2 is a Jet-A/liquid-oxygen gas-generator-cycle family with a single-shaft turbopump for RS1. ABL identifies three configurations: E2 Vacuum for stage 2, E2 Sea Level Radial for stage 1, and a double-chamber E2 Sea Level Center variant; each is described as producing more than 16,000 lbf of vacuum thrust. This family is retained as historical because ABL exited the commercial launch market and shifted focus to missile defense; the record describes the E2 family, not RS1.
- Developers
- Manufacturers
- Propellants
- Jet-Aliquid oxygen
- Rocket Specs
- Cycle
- gas-generator
Links
- Official Url
- https://blog.ablspacesystems.com/p/building-e2/
Assets & Meta
- Creation Time
- July 29, 2026 at 11:21:09 UTC
- Updated Time
- August 21, 2026 at 16:55:47 UTC
Other
- Sources
- Accessed Date
- 2026-08-21
- Note
- ABL's official E2 engineering article identifies Jet-A/liquid oxygen propellants, a gas-generator cycle, a single-shaft turbopump, the E2 Vacuum, Sea Level Radial, and double-chamber Sea Level Center configurations, and more than 16,000 lbf of vacuum thrust for each configuration.
- Publisher
- ABL Space Systems
- Title
- Building a Rocket Engine from Scratch
- Accessed Date
- 2026-08-21
- Note
- ABL's RS1 Payload User's Guide provides the vehicle-level context for the E2 family without collapsing its sea-level and vacuum configurations into one installation-specific engine.
- Publisher
- ABL Space Systems
- Title
- RS1 Payload User's Guide, Version 1.0
- Accessed Date
- 2026-08-21
- Note
- SpaceNews reports that ABL Space Systems exited the commercial launch market in November 2024 and shifted its focus to missile defense, supporting the historical lifecycle status of this RS1-oriented E2 family record.
- Publisher
- SpaceNews
- Title
- ABL Space exits commercial launch market, shifts focus to missile defense