Blue Origin unveils New Glenn GS3 third stage and Northstar booster engine

5 min read · reported by NASASpaceflight

Blue Origin chief executive Dave Limp has unveiled a third stage for New Glenn and a new booster engine, expanding the rocket’s reach into high-energy orbits and deepening the company’s American-made propulsion line-up.

The third stage, GS3, is aimed at direct injection to geostationary orbit (GEO) and Earth-escape trajectories. Alongside it, Blue Origin introduced Northstar, a liquid oxygen and liquefied natural gas (LOX/LNG) booster engine rated at 715,000 pounds of thrust.

New Glenn has already flown as a two-stage vehicle from Launch Complex 36 at Cape Canaveral, including its NG-1 debut with the Blue Ring Pathfinder, the NG-2 ESCAPADE mission for NASA, and AST SpaceMobile satellites on NG-3.

NG-4 was destroyed in the pad explosion during a static fire attempt in May. However, thanks to an impressive pad repair effort , Blue Origin is already preparing to return to flight with NG-4.1, with booster “Never Tell Me The Odds”, early in 2027.

The company has been promoting an ambitious forward schedule for 2027 and beyond, with an increasing launch cadence, plus another launch pad ( LC-36B ) and a new rocket variant.

Now, with the official news relating to GS3, New Glenn adds a high-energy option on both the current 7×2 architecture and the larger 9×4 variant Blue Origin outlined previously.

See NSF’s December 2025 New Glenn upgrades and Blue Moon coverage, and the Cape campus ramp-up report. GS3 opens direct GEO and deep space

Blue Origin says GS3 covers high-energy missions the two-stage stack is not intended to handle in the same way, including direct GEO injection and Earth-escape paths.

On the 7×2 vehicle, the company quotes up to 8 metric tonnes to GEO and 10 metric tonnes to trans-lunar injection (TLI). On the 9×4 vehicle, those figures rise to 14 metric tonnes to GEO and 20 metric tonnes to TLI.

Artist’s impression of GS3 after GS2 separation, with its BE-7 engine firing and a payload attached. Credit: Blue Origin

GS3 is already under contract for a cis-lunar mission with a government customer, scheduled to launch in 2028. Blue Origin did not name the customer in the materials provided for this report.

The stage is not required for Blue Origin’s lunar lander architecture, but the company says it can support sustained operations around the Moon. More mass delivered straight to TLI would allow faster transit while leaving propellant available for on-orbit work.

See NSF’s Blue Moon and Mars mission update for the lander side of that architecture. Same fairing, new high-energy toolkit

GS3 builds on existing New Glenn hardware and is meant to leave the customer payload experience unchanged. It uses the same fixed payload adapters and payload fairing as the two-stage vehicle.

Integrated inside an interstage, the third stage preserves the full fairing volume for spacecraft.

New Glenn 9X4 Third Stage and fairing – Credit: Blue Origin

Mission options listed for GS3 include direct insertion into medium Earth orbit (MEO) and GEO, multi-payload deployment, extended coast phases, and multiple precision burns.

Blue Origin says those features target national security and other high-energy missions that need precise orbital insertion and tight mission assurance.

BE-7 at the core, composites on the tank

GS3 is powered by Blue Origin’s BE-7 engine, the same LOX/LH2 family already tied to the company’s Blue Moon landers. For GS3 mission profiles, Blue Origin quotes vacuum specific impulse better than 460 seconds.

The stage also reuses New Glenn fluids, mechanical systems, and avionics, which the company presents as a way to cut technical risk.

Tank test at Launch Site One – Credit: Blue Origin

At Launch Site One in Texas, teams have completed a first composite liquid hydrogen (LH2) tanking test for the stage.

Using flight fluid systems, the tank was pressurised to 100 percent of Maximum Expected Operating Pressure (MEOP) for 2.5 hours, longer than Blue Origin says any GS3 mission requires.

We announced New Glenn’s third stage today (GS3). The team recently completed testing of what we expect will be the largest composite LH2 tank ever flown in space. The tank was pressurized (at cryo temps) above 100% of the Maximum Expected Operating Pressure (MEOP) for flight… pic.twitter.com/ECBvYVXENG

— Dave Limp (@davill) November 5, 2026

The same tank was also pressurised to 150 percent of MEOP for 10 minutes. Blue Origin expects the GS3 tank to be the first composite LH2 tank flown in space.

Northstar: more thrust, less mass

In the same unveiling, Blue Origin introduced Northstar, a new LOX/LNG booster engine producing 715,000 pounds of thrust. It becomes the company’s second booster engine alongside BE-4, which powers New Glenn’s first stage and ULA’s Vulcan.

Our new booster engine, Northstar, was built from the ground up by a scrappy team focused on weight, cost, manufacturability, and performance. More than 65% of the engine is additively manufactured using our in-house 3D printing capability. Northstar can be assembled in less than… pic.twitter.com/6Gt1mnNrSY

Blue Origin says more than 65 percent of Northstar is produced through additive manufacturing. Compared with BE-4, the company claims a 30 percent mass reduction and a 50 percent cut in parts count, while thrust rises from 640,000 to 715,000 pounds-force.

Northstar Engine – Credit: Blue Origin

Manufacturing changes have also shortened production timelines. Final assembly is now described as taking less than a day.

The programme moved from approval to development testing in 11 months. Northstar keeps the liquefied natural gas-fuelled, oxygen-rich staged combustion cycle and single-shaft turbopump architecture used on BE-4.

What it means for New Glenn

GS3 and Northstar point to a New Glenn family that is no longer only a two-stage LEO and GTO workhorse. Direct GEO, multi-burn high-energy profiles and a booked 2028 cis-lunar flight give GS3 a clear near-term role, while Northstar adds a higher-thrust, lighter booster path beside the flying BE-4 fleet.

Northstar render – Credit: Blue Origin

Blue Origin still has to turn the tanking milestones and engine development testing into flight hardware.

For now, the company is putting hard numbers on paper: up to 14 tonnes to GEO and 20 tonnes to TLI on 9×4 with GS3, a government cis-lunar launch in 2028, BE-7 Isp above 460 seconds on the third stage, and a 715,000 lbf Northstar engine.

Blue Origin also noted that manufacturing advancements have significantly shortened production timelines, enabling assembly in less than a day.

(Featured Image: The New Glenn Launch Vehicle Family – Credit: Blue Origin)

Reported by NASASpaceflight. Reproduced unedited by Everything Space. View the original →