E2 Vacuum
E2 Vacuum is ABL Space Systems' vacuum-optimized Jet-A/LOX gas-generator-cycle E2 variant for RS1's second stage. ABL describes a single-shaft turbopump and more than 16,000 lbf of vacuum thrust for each E2 configuration; this historical variant record is distinct from the sea-level radial and center family and from the RS1 vehicle.
Identity
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- E2 Vacuum
- Status
- historical
Details
- Description
- E2 Vacuum is ABL Space Systems' vacuum-optimized Jet-A/LOX gas-generator-cycle E2 variant for RS1's second stage. ABL describes a single-shaft turbopump and more than 16,000 lbf of vacuum thrust for each E2 configuration; this historical variant record is distinct from the sea-level radial and center family and from the RS1 vehicle.
- Developers
- Family
- Manufacturers
- Propellants
- Jet-Aliquid oxygen
- Rocket Specs
- Cycle
- gas-generator
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 11:21:16 UTC
- Updated Time
- August 21, 2026 at 16:57:03 UTC
Other
- Sources
- Accessed Date
- 2026-08-21
- Note
- ABL's official E2 engineering article identifies E2 Vacuum as the RS1 stage-2 configuration, using Jet-A and liquid oxygen in a gas-generator cycle with a single-shaft turbopump and more than 16,000 lbf of vacuum thrust.
- 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 stage-2 context for the E2 Vacuum variant without treating the vehicle as the propulsion identity.
- Publisher
- ABL Space Systems
- Title
- RS1 Payload User's Guide, Version 1.0
- Accessed Date
- 2026-08-21
- Note
- SpaceNews reports ABL's November 2024 exit from the commercial launch market and shift to missile defense, supporting this variant's historical lifecycle status.
- Publisher
- SpaceNews
- Title
- ABL Space exits commercial launch market, shifts focus to missile defense