Rocket Labs Hungry Hippo completes testing

Date:
Wed, 02 Sep 2026 21:06:05 +0000

Description:
With Rocket Lab targeting to launch its Neutron vehicle by the end of this year, The post Rocket Labs Hungry Hippo completes testing appeared first on NASASpaceFlight.com .

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With Rocket Lab targeting to launch its Neutron vehicle by the end of this year, the company is rapidly clearing milestones in the vehicles development.

Neutrons Hungry Hippo fairing has completed all testing and integration of
key subsystems, meanwhile, the company has performed hundreds of Archimedes engine hot-fires in preparation for Neutrons debut. The company has also signed multiple contracts including one with the U.S. Space Forces Space Systems Command.



Following the success of its small-lift vehicle, Electron, Rocket Lab is developing its partially reusable Neutron vehicle. The medium-lift rocket features a radical design on its fairing halves, which are usually expended
or collected by vessels with other launchers. Engineers working on the Hungry Hippo fairings (Credit: Micah Pieczarka for NSF)

The companys innovative Hungry Hippo fairings are permanently attached to the first stage of Neutron, and open during flight to deploy the second stage. This concept completely removes the need for fairing recovery vessels as well as refurbishment needed after contact with the ocean upon splashdown. See
Also Rocket Lab Forum Section L2 Wallops Section NSF Store Click here to Join L2

On Aug. 27, Rocket Lab announced that the Hungry Hippo section of the vehicle had completed all its necessary testing before the first flight. The test campaign included the opening and closing of the halves in flight-like conditions.

Earlier in the month, the company reported that the fairing had received all its required subsystems, including its thermal protection, control surfaces, and avionics. The fairing has now been moved back to the hangar at the facility in Wallops awaiting Neutrons interstage.

Like Electron, Neutrons stages and fairings are primarily constructed from carbon fiber composite materials. Rocket Lab manufactures the vehicles large composite structures in-house, using a 90-ton Automated Fiber Placement machine. Rocket Lab provided this useful explainer of a Neutron mission profile during the Electron launch broadcast. pic.twitter.com/smF48K6A7r

NSF NASASpaceflight.com (@NASASpaceflight) September 2, 2026



The 43-meter (141-foot) rocket will deliver at least 13,000 kg to low-Earth orbit in a reusable configuration featuring propulsive first-stage landing on a specialized barge located downrange. Moreover, Rocket Lab claims the capability to launch 1,500 kg to Mars and Venus.

In addition to downrange landings, the first stage will be capable of return-to-launch-site landings. However, the company does not plan to recover any stages on the first flight, which will instead focus on data collection.

Neutrons first stage features nine oxygen-rich staged combustion Archimedes engines powered by methane (CH4) and liquid oxygen (LOX), a propellant combination also known as methalox. The vehicle will be capable of producing
a total of 6,450 kilonewtons (1,450,000 lbf) of thrust during liftoff.

Rocket Lab designed the second stage to hang inside Neutrons interstage, so the stages tanks are not required to carry the main flight loads, allowing
for a lighter construction. Neutrons upper stage will be propelled by a
single vacuum-optimized Archimedes engine, also powered by methalox.
Rendering of Rocket Labs Neutron in flight (Credit: Rocket Lab)

In another August announcement, Rocket Lab disclosed that its Archimedes engine had completed over 400 hot-fire tests. Control and durability have now been confirmed across flight hardware for all major engine components. The company also revealed that the first engines for the debut of Neutron are currently in production.

The vehicle will launch from Launch Complex 3 at the Mid-Atlantic Regional Spaceport (MARS) on Wallops Island in Virginia, which was completed in 2025. The launch site has a 30-foot launch mount, which masses over 700 tons and is operated by hydraulic systems. The complex also has 180,000-gallon LOX and liquefied natural gas (LNG) propellant farms and 45,000 gallons of stored liquid nitrogen. Additionally, the pad features an over 200-foot water supply tower, capable of storing over 200,000 gallons of water for launch
activities.

Rocket Lab intends to use the vehicle to launch satellite constellations, national security missions, and planetary exploration missions. That's a wrap on our latest checkouts for Neutron's reusable Hungry Hippo fairing The Hippo is now back inside its hangar where it will be integrated with Neutron's interstage once it arrives to the Eastern Shore. pic.twitter.com/XRaxFDuhud

Rocket Lab (@RocketLab) August 27, 2026



As well as preparing for its inaugural Neutron flight and launching its Electron vehicle at a high cadence, Rocket Lab has also signed multiple contracts recently for satellite development. The company stated it had been chosen as one of the partners for the U.S. Space Force Space Systems Commands Space Data Network (SDN).

The SDN is a next-generation military communications architecture, for which Rocket Lab will develop and test communications systems. Additionally, the company will perform an on-orbit demonstration of optical and network capabilities with one of its Photon satellites. Rocket Lab is proud to be selected as partner by @USSF_SSC to support the Space Data Network.

We're leveraging our advanced capabilities to support the program, including the design, testing, and demonstration of key technologies to enable seamless communication between https://t.co/LfSZxykgyD

Rocket Lab (@RocketLab) August 14, 2026



Viasat, a communications satellite company, also selected Rocket Lab to develop a geosynchronous satellite bus for the Space Systems Command that
will deliver Viasats Swarm 1 under the Protected Tactical SAT-Global program. The GEO bus will utilize Rocket Labs high-performance Lightning-GEO platform.

As Rocket Lab shifts from a small-sat pioneer to a medium-lift contender, the launch of Neutron will mark a key turning point for the company.

(Lead Image: Rocket Labs Hungry Hippo fairing during testing. Credit: Rocket Lab)



The post Rocket Labs Hungry Hippo completes testing appeared first on NASASpaceFlight.com .



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Link to news story:
https://www.nasaspaceflight.com/2026/09/rocket-lab-update/


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