For the first time, an Australian rocket will take aim at low-Earth orbit
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For the first time, an Australian rocket will take aim at low-Earth orbit
With its first launch, Gilmour Space is "looking for 10 to 20 seconds of stable flight."
Stephen Clark
–
May 14, 2025 3:33 pm
|
0
Gilmour's Eris rocket inside a hangar at the launch site in northeastern Australia.
Credit:
Gilmour Space
Gilmour's Eris rocket inside a hangar at the launch site in northeastern Australia.
Credit:
Gilmour Space
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Gilmour Space, a venture-backed startup based in Australia, is about to launch a small rocket from its privately owned spaceport on a remote stretch of the country's northeastern coastline.
It's the first time anyone has attempted to reach orbit with a rocket designed and built in Australia. Gilmour's three-stage rocket, named Eris, could launch at any time during a 10-hour window Thursday, local time. In the United States, the launch window runs from 5:30 pm EDT Wednesday until 3:30 am EDT Thursday.
The debut launch of Gilmour's Eris rocket is purely a test flight. Gilmour has tested the rocket's engines and rehearsed the countdown last year, loading propellant and getting within 10 seconds of launch. But Gilmour cautioned in a post on LinkedIn early Wednesday that "test launches are complex." Gilmour added on social media that "weather, systems checks, or technical issues may delay the flight—sometimes by hours, days, or longer."
Gilmour, based in Gold Coast, Australia, was founded in 2012 by two brothers—Adam and James Gilmour—who came to the space industry after careers in banking and marketing. Today, Gilmour employs more than 200 people, mostly engineers and technicians. Most are recent engineering graduates in their 20s, along with a handful of space industry veterans with experience at companies like Rocket Lab, Firefly Aerospace, Avio, and Airbus.
The company has raised approximately million, primarily from venture capital firms, to get the first Eris rocket to the launch pad. The funding also paid for construction of Bowen Orbital Spaceport, Gilmour's launch site in the Australian state of Queensland. Apart from launch vehicles, Gilmour is working on its own satellite platform, which could launch on Eris or foreign rockets.
Looking for stable flight
But Eris is the core of Gilmour's business. Built to haul small satellites to orbit, the rocket stands 82 feettall and has an unusual design for a modern launcher, with three stages, each powered by hybrid engines burning a proprietary solid fuel mixed with a liquid oxidizer.
Hybrid engines are an unconventional choice. They have a low thrust density, meaning they produce less thrust per unit area of the engine's nozzle. Effectively, hybrid engines produce relatively little thrust for their size. Hybrid rocket engines also burn fuel more slowly than traditional solid- or liquid-fueled rockets, making it difficult to reach high thrust levels.
Gilmour's Eris rocket stands on its launch pad in Queensland, Australia.
Credit:
Gilmour Space
There are some advantages to hybrid engines. They are less complexthan a liquid-fueled rocket engine, and unlike a solid rocket motor, hybrid engines can be throttled or turned off in the event of a problem. For these reasons, Virgin Galactic's commercial suborbital rocket plane uses a hybrid engine burning a rubber-based solid fuel and liquid nitrous oxide.
Gilmour's rocket uses hydrogen peroxide for an oxidizer. The company hasn't released details about the rocket's solid fuel, citing proprietary reasons. Four of Gilmour's Sirius engines power the first stage of the Eris rocket, collectively generating more than 100,000 pounds of thrust. A single Sirius engine is mounted on the second stage, and Eris' third stage is driven by a smaller liquid-fueled engine named Phoenix, also designed by Gilmour Space.
Like many launch startups, Gilmour is setting modest expectations for the inaugural flight of Eris. The first time Gilmour will ignite four of its Sirius engines at the same time will be in the final moments before liftoff.
"Eris is a first-of-its-kind rocket," Gilmour wrote on social media. "While it’s capable of reaching orbit, that’s not the expectation this time.This mission is all about gathering critical data to improve future flights."
Michelle Gilmour, the company's head of marketing and communications, told Ars the first milestone of the test flight "would simply be getting off the pad. Then, we’d be looking for 10 to 20 seconds of stable flight."
A “manageable” drop zone
If the rocket makes it that far, it will clear the coastline and head northeast, soaring over the Great Barrier Reef and the Coral Sea. This flight path raised concerns about environmental impacts to the Great Barrier Reef, but the government of Queensland determined the environmental risk "would likely be manageable" with drop zones for the first and second stages of the rocket outside the Great Barrier Reef World Heritage Area.
The Eris rocket will fly northeast from Bowen Orbital Spaceport over the Great Barrier Reef.
Credit:
Queensland Government
Australia's government approved a launch facility license for Gilmour Space in April of last year, and the Australian Space Agency granted a launch permit for the first flight of the Eris rocket in November. Australia's Civil Aviation Safety Authority gave Gilmour airspace approval in February. But then, Gilmour encountered more regulatory issues as a tropical cyclone churned off the coast of the launch site. The regulatory and weather delays abated, and the Australian Space Agency issued its final approval for Gilmour's launch last week.
This is all uncharted territory for not just Gilmour, but also Australia's government. Australia hosted a handful of satellite launches with US and British rockets from 1967 through 1971, but Gilmour's Eris is the first all-Australian launch vehicle designed for orbital flight.
The Eris rocket is capable of delivering about 670 poundsof mass into low-Earth orbit, a payload capacity roughly equivalent to Rocket Lab's Electron launch vehicle, which flies from New Zealand, home of the world's only other operational commercial spaceport in the Southern Hemisphere.
A perfect flight for the Eris rocket would see it reach an orbit around 120 mileshigh at an inclination of 33 degrees to the equator, according to Gilmour. Just in case, the company has placed a jar of Vegemite, a popular food spread in Australia, on Eris' third stage in a tongue-in-cheek nod to Aussie culture.
Stephen Clark
Space Reporter
Stephen Clark
Space Reporter
Stephen Clark is a space reporter at Ars Technica, covering private space companies and the world’s space agencies. Stephen writes about the nexus of technology, science, policy, and business on and off the planet.
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#first #time #australian #rocket #will
For the first time, an Australian rocket will take aim at low-Earth orbit
Eres tú
For the first time, an Australian rocket will take aim at low-Earth orbit
With its first launch, Gilmour Space is "looking for 10 to 20 seconds of stable flight."
Stephen Clark
–
May 14, 2025 3:33 pm
|
0
Gilmour's Eris rocket inside a hangar at the launch site in northeastern Australia.
Credit:
Gilmour Space
Gilmour's Eris rocket inside a hangar at the launch site in northeastern Australia.
Credit:
Gilmour Space
Story text
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Small
Standard
Large
Width
*
Standard
Wide
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Gilmour Space, a venture-backed startup based in Australia, is about to launch a small rocket from its privately owned spaceport on a remote stretch of the country's northeastern coastline.
It's the first time anyone has attempted to reach orbit with a rocket designed and built in Australia. Gilmour's three-stage rocket, named Eris, could launch at any time during a 10-hour window Thursday, local time. In the United States, the launch window runs from 5:30 pm EDT Wednesday until 3:30 am EDT Thursday.
The debut launch of Gilmour's Eris rocket is purely a test flight. Gilmour has tested the rocket's engines and rehearsed the countdown last year, loading propellant and getting within 10 seconds of launch. But Gilmour cautioned in a post on LinkedIn early Wednesday that "test launches are complex." Gilmour added on social media that "weather, systems checks, or technical issues may delay the flight—sometimes by hours, days, or longer."
Gilmour, based in Gold Coast, Australia, was founded in 2012 by two brothers—Adam and James Gilmour—who came to the space industry after careers in banking and marketing. Today, Gilmour employs more than 200 people, mostly engineers and technicians. Most are recent engineering graduates in their 20s, along with a handful of space industry veterans with experience at companies like Rocket Lab, Firefly Aerospace, Avio, and Airbus.
The company has raised approximately million, primarily from venture capital firms, to get the first Eris rocket to the launch pad. The funding also paid for construction of Bowen Orbital Spaceport, Gilmour's launch site in the Australian state of Queensland. Apart from launch vehicles, Gilmour is working on its own satellite platform, which could launch on Eris or foreign rockets.
Looking for stable flight
But Eris is the core of Gilmour's business. Built to haul small satellites to orbit, the rocket stands 82 feettall and has an unusual design for a modern launcher, with three stages, each powered by hybrid engines burning a proprietary solid fuel mixed with a liquid oxidizer.
Hybrid engines are an unconventional choice. They have a low thrust density, meaning they produce less thrust per unit area of the engine's nozzle. Effectively, hybrid engines produce relatively little thrust for their size. Hybrid rocket engines also burn fuel more slowly than traditional solid- or liquid-fueled rockets, making it difficult to reach high thrust levels.
Gilmour's Eris rocket stands on its launch pad in Queensland, Australia.
Credit:
Gilmour Space
There are some advantages to hybrid engines. They are less complexthan a liquid-fueled rocket engine, and unlike a solid rocket motor, hybrid engines can be throttled or turned off in the event of a problem. For these reasons, Virgin Galactic's commercial suborbital rocket plane uses a hybrid engine burning a rubber-based solid fuel and liquid nitrous oxide.
Gilmour's rocket uses hydrogen peroxide for an oxidizer. The company hasn't released details about the rocket's solid fuel, citing proprietary reasons. Four of Gilmour's Sirius engines power the first stage of the Eris rocket, collectively generating more than 100,000 pounds of thrust. A single Sirius engine is mounted on the second stage, and Eris' third stage is driven by a smaller liquid-fueled engine named Phoenix, also designed by Gilmour Space.
Like many launch startups, Gilmour is setting modest expectations for the inaugural flight of Eris. The first time Gilmour will ignite four of its Sirius engines at the same time will be in the final moments before liftoff.
"Eris is a first-of-its-kind rocket," Gilmour wrote on social media. "While it’s capable of reaching orbit, that’s not the expectation this time.This mission is all about gathering critical data to improve future flights."
Michelle Gilmour, the company's head of marketing and communications, told Ars the first milestone of the test flight "would simply be getting off the pad. Then, we’d be looking for 10 to 20 seconds of stable flight."
A “manageable” drop zone
If the rocket makes it that far, it will clear the coastline and head northeast, soaring over the Great Barrier Reef and the Coral Sea. This flight path raised concerns about environmental impacts to the Great Barrier Reef, but the government of Queensland determined the environmental risk "would likely be manageable" with drop zones for the first and second stages of the rocket outside the Great Barrier Reef World Heritage Area.
The Eris rocket will fly northeast from Bowen Orbital Spaceport over the Great Barrier Reef.
Credit:
Queensland Government
Australia's government approved a launch facility license for Gilmour Space in April of last year, and the Australian Space Agency granted a launch permit for the first flight of the Eris rocket in November. Australia's Civil Aviation Safety Authority gave Gilmour airspace approval in February. But then, Gilmour encountered more regulatory issues as a tropical cyclone churned off the coast of the launch site. The regulatory and weather delays abated, and the Australian Space Agency issued its final approval for Gilmour's launch last week.
This is all uncharted territory for not just Gilmour, but also Australia's government. Australia hosted a handful of satellite launches with US and British rockets from 1967 through 1971, but Gilmour's Eris is the first all-Australian launch vehicle designed for orbital flight.
The Eris rocket is capable of delivering about 670 poundsof mass into low-Earth orbit, a payload capacity roughly equivalent to Rocket Lab's Electron launch vehicle, which flies from New Zealand, home of the world's only other operational commercial spaceport in the Southern Hemisphere.
A perfect flight for the Eris rocket would see it reach an orbit around 120 mileshigh at an inclination of 33 degrees to the equator, according to Gilmour. Just in case, the company has placed a jar of Vegemite, a popular food spread in Australia, on Eris' third stage in a tongue-in-cheek nod to Aussie culture.
Stephen Clark
Space Reporter
Stephen Clark
Space Reporter
Stephen Clark is a space reporter at Ars Technica, covering private space companies and the world’s space agencies. Stephen writes about the nexus of technology, science, policy, and business on and off the planet.
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#first #time #australian #rocket #will
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