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Vulcan Centaur

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This article is about the American Vulcan Centaur launch vehicle by ULA. Not to be confused with the Russian Vulkan-Hercules concept launch vehicle or the European Vulcain rocket engine. For other uses, see Vulcan (disambiguation).

Vulcan Centaur
Vulcan Centaur in VC2S configuration ahead of its maiden flight
FunctionHeavy-lift launch vehicle
ManufacturerUnited Launch Alliance
Country of originUnited States
Cost per launchAbout US$100–200 million[1][2]
Size
Height61.6–67.3 m (202–221 ft)[3]
Diameter5.4 m (18 ft)[4]
Mass546,700 kg (1,205,300 lb)
Stages2
Capacity
Payload to LEO (28.7°)
Mass27,200 kg (60,000 lb)[5]
Payload to GTO (27.0°)
Mass15,300 kg (33,700 lb)[5]
Payload to GEO
Mass7,000 kg (15,000 lb)[5]
Payload to TLI
Mass12,100 kg (26,700 lb)[5]
Launch history
StatusOperational
Launch sites
Total launches1
Success(es)1
First flight8 January 2024[7]
Boosters – GEM-63XL
No. boosters0, 2, 4, or 6[8]
Height22.0 m (865 in)
Diameter1.62 m (63.7 in)
Empty mass4,521 kg (9,966 lb)
Gross mass53,030 kg (116,920 lb)
Propellant mass47,853 kg (105,497 lb)
Maximum thrust2,061 kN (463,249 lbf)
Specific impulse280.3 s (2.749 km/s)
Burn time87.3 seconds
PropellantAP / HTPB / Al
First stage – Vulcan
Diameter5.4 m (18 ft)
Powered by2 × BE-4
Maximum thrust4,900 kN (1,100,000 lbf)
PropellantCH4 / LOX
Second stage – Centaur V
Diameter5.4 m (18 ft)
Powered by2 × RL10[9]
Maximum thrust212 kN (48,000 lbf)[10]
Specific impulse453.8 s (4.450 km/s)[10]
PropellantLH2 / LOX
[edit on Wikidata]

Vulcan Centaur is a heavy-lift launch vehicle created and operated by United Launch Alliance (ULA). It is a two-stage-to-orbit launch vehicle consisting of the Vulcan first stage and the Centaur second stage. It replaces ULA's Atlas V and Delta IV rockets. It is principally designed for the National Security Space Launch (NSSL) program, which launches satellites for U.S. intelligence agencies and the Defense Department, but will also be used for commercial launches.

ULA began developing the Vulcan rocket in 2014, largely to compete with SpaceX's cheaper, partially reusable rockets and to comply with a Congressional requirement to stop using the Russian-made RD-180 engine that powers the Atlas V. The first flight of the Vulcan Centaur was initially slated for 2019, but was delayed multiple times by developmental problems with its BE-4 engine and the Centaur upper stage.[11] Vulcan Centaur launched for the first time on 8 January 2024 carrying Astrobotic Technology's Peregrine lunar lander, the first mission of NASA's Commercial Lunar Payload Services (CLPS) program.[12]

Description[edit]

The Vulcan Centaur uses technologies from ULA's Atlas V and Delta IV launch vehicles, plus newer gear for better performance and lower costs. The Vulcan first stage is the same size as the Delta family's Common Booster Core, allowing ULA to reuse manufacturing equipment.

It uses two BE-4 engines built by Blue Origin that burn liquid oxygen and liquid methane (liquefied natural gas).[13][14] Methane burns cleaner than the kerosene used on Atlas, spewing less particle pollution and making it more suitable for engine reuse. Compared to the liquid hydrogen used on Delta, it is denser and has a greater temperature range, allowing fuel tanks to be smaller and lighter.[15][16]

The second stage is the Centaur V, an improved version of the Centaur III used on the Atlas, which is powered by two RL10 engines built by Aerojet Rocketdyne, fueled by liquid hydrogen and liquid oxygen.[17] The first stage can be supplemented by up to six GEM 63XL solid rocket boosters built by Northrop Grumman.[8][18]

Vulcan Centaur offers heavy-lift capabilities in the footprint of a medium-lift launch vehicle. With a single core and six GEM boosters, the Vulcan Centaur can lift 27,200 kilograms (60,000 lb) to low Earth orbit (LEO).[19] That is much more than the 18,850 kg (41,560 lb) that the Atlas V could lift to LEO with a single core and five GEM boosters,[20] and nearly as much as the three-core Delta IV Heavy which could lift 28,790 kg (63,470 lb) to LEO.[21]

Vulcan has been designed to meet the requirements of the National Security Space Launch program and is designed to achieve human-rating certification to allow the launch of a vehicle such as the Boeing Starliner or Sierra Nevada Dream Chaser.[17][22][3]

Versions and configurations[edit]

ULA has four-character designations for the various Vulcan Centaur configurations. They start with VC for the Vulcan first stage and the Centaur upper stage. The third character is the number of SRBs attached to the Vulcan—0, 2, 4 or 6—and the fourth denotes the payload-fairing length: S for Standard (15.5 m (51 ft)) or L for Long (21.3 m (70 ft)).[23] For example, "VC6L" would represent a Vulcan first stage, a Centaur upper stage, six SRBs and a long-configuration fairing.[23] The most powerful Vulcan Centaur will have a Vulcan first stage, a Centaur upper stage with RL10CX engines with a nozzle extension and six SRBs.[24]

Capabilities[edit]

The payload capacity of Vulcan Centaur versions are:[25][24]

Version SRBs Payload mass to...
ISS[a] SSO[b] MEO[c] GEO[d] GTO[e] Molniya[f] TLI[g] TMI
Vulcan Centaur VC0 0 8,800 kg (19,400 lb) 7,900 kg (17,400 lb) 300 kg (660 lb) — 3,300 kg (7,300 lb) 2,500 kg (5,500 lb) 2,100 kg (4,600 lb) —
Vulcan Centaur VC2 2 16,300 kg (35,900 lb) 14,400 kg (31,700 lb) 3,800 kg (8,400 lb) 2,500 kg (5,500 lb) 8,300 kg (18,300 lb) 6,200 kg (13,700 lb) 6,200 kg (13,700 lb) 3,600 kg (7,900 lb)
Vulcan Centaur VC4 4 21,400 kg (47,200 lb) 18,500 kg (40,800 lb) 6,100 kg (13,400 lb) 4,800 kg (10,600 lb) 11,600 kg (25,600 lb) 8,900 kg (19,600 lb) 9,100 kg (20,100 lb) 6,000 kg (13,000 lb)
Vulcan Centaur VC6 6 25,600 kg (56,400 lb) 22,300 kg (49,200 lb) 7,900 kg (17,400 lb) 6,300 kg (13,900 lb) 14,400 kg (31,700 lb) 10,600 kg (23,400 lb) 11,300 kg (24,900 lb) 7,600 kg (16,800 lb)
Vulcan Centaur VC6 (upgrade) 6 26,900 kg (59,300 lb) TBA 8,600 kg (19,000 lb) 7,000 kg (15,000 lb) 15,300 kg (33,700 lb) TBA 12,100 kg (26,700 lb) 7,600 kg (16,800 lb)
Notes
  1. ^ 407 km (253 mi) circular orbit at 51.6° inclination
  2. ^ 555 km (345 mi) circular orbit at 98.75° inclination
  3. ^ 20,368 km (12,656 mi) circular orbit at 55° inclination
  4. ^ 36,101 km (22,432 mi) circular orbit at 0° inclination
  5. ^ 1,800 m/s delta-V with 185 km (115 mi) perigee and 35,786 km (22,236 mi) apogee orbit at 27° inclination
  6. ^ 1,203 km (748 mi) perigee and 39,170 km (24,340 mi) apogee orbit at 63.4° inclination
  7. ^ C3: -2 km2/sec2

These capabilities reflect NSSL requirements, plus room for growth.[5][26]

A Vulcan Centaur with six solid rocket boosters can put 27,200 kilograms into low Earth orbit, nearly as much as the three-core Delta IV Heavy.[27]

History[edit]

Background[edit]

ULA decided to develop the Vulcan Centaur in 2014 for two main reasons. First, its commercial and civil customers were flocking to SpaceX's cheaper Falcon 9 reusable launch vehicle, leaving ULA increasingly reliant on U.S. military and spy agency contracts.[28][29] Second, Russia's annexation of Crimea in 2014 heightened Congressional discomfort with the Pentagon's reliance on the Atlas V, which used the made-in-Russia RD-180 engine. In 2016, Congress would pass a law barring the military from procuring launch services based on the RD-180 engine after 2022.[30]

In September 2014, ULA announced that it had picked the BE-4 engine from Blue Origin and fueled by liquid oxygen (LOX) and liquid methane (CH4) to replace the RD-180 on a new first-stage booster. The engine was already in its third year of development, and ULA said it expected the new stage and engine to start flying as soon as 2019.[31] Two of the 2,400-kilonewton (550,000 lbf)-thrust BE-4 engines were to be used on a new launch vehicle booster.[32][33][31]

A month later, ULA restructured company processes and its workforce to reduce costs. The company said that the successor to Atlas V would blend existing Atlas V and Delta IV with a goal of halving the cost of the Atlas V rocket.[29]

Announcement[edit]

In 2015, ULA announced the Vulcan rocket and a proposing to incrementally replace existing vehicles with it.[34] Vulcan deployment was expected to begin with a new first stage that was based on the Delta IV's fuselage diameter and production process, and initially expected to use two BE-4 engines or the AR1 as an alternative. The second stage was to be the existing Centaur III, already used on Atlas V. A later upgrade, the Advanced Cryogenic Evolved Stage (ACES), was planned to be introduced a few years after Vulcan's first flight.[34] ULA also revealed a design concept for reuse of the Vulcan booster engines, thrust structure and first stage avionics, which could be detached as a module from the propellant tanks after booster engine cutoff; the module would re-enter the atmosphere behind an inflatable heat shield.[35]

Funding[edit]

Through the first several years, the ULA board of directors made quarterly funding commitments to Vulcan Centaur development.[36] As of October 2018, the US government had committed about $1.2 billion in a public–private partnership to Vulcan Centaur development, with plans for more once ULA concluded a National Security Space Launch contract.[37]

By March 2016, the United States Air Force (USAF) had committed up to $202 million for Vulcan development. ULA had not yet estimated the total cost of development but CEO Tory Bruno said that "new rockets typically cost $2 billion, including $1 billion for the main engine".[36] In March 2018, Bruno said the Vulcan-Centaur had been "75% privately funded" up to that point.[quantify][38] In October 2018, following a request for proposals and technical evaluation, ULA was awarded $967 million to develop a prototype Vulcan launch system as part of the National Security Space Launch program.[37]

Development, production, and testing[edit]

In September 2015, it was announced BE-4 rocket engine production would be expanded to allow more testing.[39] The following January, ULA was designing two versions of the Vulcan first stage; the BE-4 version has a 5.4 m (18 ft) diameter to support the use of the less dense methane fuel.[14] In late 2017, the upper stage was changed to the larger and heavier Centaur V, and the launch vehicle was renamed Vulcan Centaur.[38] In May 2018, ULA announced the selection of Aerojet Rocketdyne's RL10 engine for the Vulcan Centaur upper stage.[40] That September, ULA announced the selection of the Blue Origin BE-4 engine for Vulcan's first stage.[41][42] In October, the USAF released an NSSL launch service agreement with new requirements, delaying Vulcan's initial launch to April 2021, after an earlier postponement to 2020.[43][44][45]

In August 2019, the parts of Vulcan's mobile launcher platform (MLP) were transported[46] to the Spaceflight Processing Operations Center (SPOC) near SLC-40 and SLC-41, Cape Canaveral, Florida. The MLP was fabricated in eight sections and moves at 3 mph (4.8 km/h) on rail bogies, standing 183 ft (56 m) tall.[47] In February 2021, ULA shipped the first completed Vulcan core booster to Florida for pathfinder tests ahead of the Vulcan's debut launch.[48] Testing continued proceeded with the pathfinder booster throughout that year.[49][50]

In August 2019, ULA said Vulcan Centaur would first fly in early 2021, carrying Astrobotic Technology's Peregrine lunar lander.[51][52][33]By December 2020, the launch had been delayed to 2022 because of technical problems with the BE-4 main engine.[53][54] In June 2021, Astrobotic said Peregrine would not be ready on time due to the COVID-19 pandemic, delaying the mission and Vulcan Centaur's first launch; further Peregrine delays put the launch of Vulcan into 2023.[55][56][57] In March 2023, a Centaur V test stage failed during a test sequence. To fix the problem, ULA changed the structure of the stage and built a new Centaur for Vulcan Centaur's maiden flight.[58] In October 2023, ULA announced they aimed to launch Vulcan Centaur by year's end.[59]

Certification flights[edit]

Launch of the Peregrine lunar lander on Vulcan Centaur's first flight

On 8 January 2024, Vulcan lifted off for the first time. The flight used the VC2S configuration, with two solid rocket boosters and a standard-length fairing. A 4-minute trans-lunar injection burn followed by payload separation put the Peregrine lander on a trajectory to the Moon. One hour and 18 minutes into the flight, the Centaur upper stage fired for a third time, sending it into a heliocentric orbit to test how it would behave in long missions, such as those required to send payloads to geostationary orbit.[12][60]

A failure in the Peregrine's propulsion system shortly after separation prevented it from landing on the Moon; Astrobotic said the Vulcan Centaur rocket performed without problems.[61]

On 14 August 2019, ULA won a commercial competition when it was announced the second Vulcan certification flight would be named SNC Demo-1, the first of seven Dream Chaser CRS-2 flights under NASA's Commercial Resupply Services program. They will use the four-SRB VC4 configuration.[62] The SNC Demo-1 was scheduled for launch no earlier than April 2024.[63]

After Vulcan Centaur's second certification mission, the rocket will be qualified for use on U.S. military missions.[64] As of August 2020, Vulcan was to launch ULA's awarded 60% share of National Security Space Launch payloads from 2022 to 2027,[65] but delays occurred. The Space Force's USSF-51 launch in late 2022 was be the first national security classified mission, but in May 2021 the spacecraft was reassigned to an Atlas V to "mitigate schedule risk associated with Vulcan Centaur non-recurring design validation".[66] For similar reasons, the Kuiper Systems prototype flight was moved to an Atlas V rocket.[67]

After Vulcan's first launch in January 2024, developmental delays with the Dream Chaser led ULA to contemplate replacing it with a mass simulator so Vulcan could move ahead with the certification required by its Air Force contract.[68] Bloomberg News reported in May 2024 that United Launch Alliance was accruing financial penalties due to delays in the military launch contracts.[69] On 10 May, Air Force Assistant Secretary Frank Calvelli wrote to Boeing and Lockheed executives. "I am growing concerned with ULA's ability to scale manufacturing of its Vulcan rocket and scale its launch cadence to meet our needs", Calvelli wrote in the letter, a copy of which was obtained by the Washington Post. "Currently there is military satellite capability sitting on the ground due to Vulcan delays."[70] In June 2024, Bruno announced that Vulcan would make its second flight in September with an “inert payload” plus some “experiments and demonstrations” to help develop future technology for the Centaur upper stage.[71]

Potential upgrades[edit]

Since 2015, ULA has spoken of several technologies that would improve the Vulcan launch vehicle's capabilities. These include first-stage improvements to make the most expensive components potentially reusable and second-stage improvements to allow the rocket to operate for months in Earth-orbit cislunar space.[72]

Long-endurance upper stages[edit]

Main article: Advanced Cryogenic Evolved Stage

The ACES upper stage—fueled with liquid oxygen (LOX) and liquid hydrogen (LH2) and powered by up to four rocket engines with the engine type yet to be selected—was a conceptual upgrade to Vulcan's upper stage at the time of the announcement in 2015. This stage could be upgraded to include Integrated Vehicle Fluids technology that would allow the upper stage to function in orbit for weeks instead of hours. The ACES upper stage was cancelled in September 2020[34][73], and ULA said the Vulcan second stage would now be the Centaur V upper stage: a larger, more powerful version of the Dual Engine Centaur upper stage used by the Atlas V N22.[17][72] A senior executive at ULA said the Centaur V design was also heavily influenced by ACES.[74][27]

However, ULA said in 2021 that it is working to add more value to upper stages by having them perform tasks such as operating as space tugs. CEO Tory Bruno says ULA is working on upper stages with hundreds of times the endurance of those currently in use.[74]

SMART reuse[edit]

A method of main engine reuse called Sensible Modular Autonomous Return Technology (SMART) is a proposed upgrade for Vulcan Centaur. In the concept, the booster engines, avionics, and thrust structure detach as a module from the propellant tanks after booster engine cutoff. The engine module then falls through the atmosphere protected by an inflatable heat shield. After parachute deployment, the engine section splashes down, using the heatshield as a raft.[75] ULA estimated this technology could reduce the cost of the first stage propulsion by 90%, and 65% of the total first-stage cost.[35][75] Although SMART reuse was not initially funded for development,[72] from 2021 the higher launch cadence required to launch the Project Kuiper megaconstellation provided support for the concept's business case.[76] Prior to 2022, ULA intended to catch the engine section using a helicopter.[75]

Vulcan Heavy[edit]

In September 2020, ULA announced that they were carefully studying a "Vulcan Heavy" variant with three booster cores. Speculation about a new variant had been rampant for months after an image of a model of that version popped on social media. ULA CEO Tory Bruno later tweeted a clearer image of the model and said it was the subject of ongoing study.[77][78][needs update]

Vulcan Centaur launches[edit]

This section is transcluded from List of Vulcan launches (2020–29). (edit | history)

2024[edit]

Flight No. Date / time (UTC) Rocket,
configuration 		Launch site Payload Payload mass Orbit Customer Launch
outcome
1 8 January 2024,
07:18 		Vulcan Centaur VC2S CCSFS, SLC-41 Peregrine lander 1,283 kg (2,829 lb) TLI Astrobotic Technology Success[79]
Enterprise (space burial) Heliocentric Celestis
Maiden flight of Vulcan Centaur. Vulcan Certification-1 mission. Payload from Celestis, demonstrated engine restart capability of the Centaur upper stage delivering multiple payloads to different orbits. The Peregrine payload failed in transit to the Moon, precluding a landing attempt, due to reasons unrelated to the launch vehicle.[80]

See also[edit]

References[edit]

  1. ^ Clark, Stephen. "ULA needs commercial customers to close Vulcan rocket business case". Spaceflight Now. Archived from the original on 5 June 2020. Retrieved 22 April 2015.
  2. ^ Shalal, Andrea; Klotz, Irene (13 April 2015). "'Vulcan' rocket launch in 2019 may end U.S. dependence on Russia". Reuters. Archived from the original on 5 June 2020. Retrieved 13 April 2015.
  3. ^ a b "Vulcan Centaur Cutaway Poster" (PDF). United Launch Alliance. November 2019. Archived (PDF) from the original on 22 December 2022. Retrieved 14 April 2020.
  4. ^ Peller, Mark. "United Launch Alliance" (PDF). Archived from the original (PDF) on 12 April 2016. Retrieved 30 March 2016.
  5. ^ a b c d e "Vulcan". United Launch Alliance. Archived from the original on 9 May 2022. Retrieved 25 January 2023.
  6. ^ Clark, Stephen (12 October 2015). "ULA selects launch pads for new Vulcan rocket". Spaceflight Now. Archived from the original on 14 October 2015. Retrieved 12 October 2015.
  7. ^ Robinson-Smith, Will (21 December 2023). "ULA stacks Vulcan rocket for the first time ahead of Jan. 8 debut launch". Spaceflight Now. Archived from the original on 22 December 2023. Retrieved 22 December 2023.
  8. ^ a b @ToryBruno (1 July 2019). "Vulcan is configurable with 0 to 6 SRBs. 2 fairing lengths, the longer, 70 ft fairing having a massive 11,000 cuft (317 cu-m) payload volume" (Tweet) – via Twitter.
  9. ^ "United Launch Alliance Selects Aerojet Rocketdyne's RL10 Engine". ULA. 11 May 2018. Archived from the original on 12 May 2018. Retrieved 13 May 2018.
  10. ^ a b "Aerojet Rocketdyne RL10 Propulsion System" (PDF). Aerojet Rocketdyne. Archived (PDF) from the original on 29 June 2019. Retrieved 29 June 2019.
  11. ^ Eric Berger (5 January 2024). "As Vulcan nears debut, it's not clear whether ULA will live long and prosper". Ars Technica. Archived from the original on 6 January 2024. Retrieved 8 January 2024.
  12. ^ a b Jeff Foust (8 January 2024). "Vulcan Centaur launches Peregrine lunar lander on inaugural mission". Spacenews. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  13. ^ Clark, Stephen (21 May 2021). "United Launch Alliance nears first fueling test on Vulcan rocket". Space Flight Now. Retrieved 8 June 2021.
  14. ^ a b de Selding, Peter B. (16 March 2016). "ULA intends to lower its costs, and raise its cool, to compete with SpaceX". SpaceNews. Archived from the original on 17 March 2016. Retrieved 19 March 2016. Methane rocket has a lower density so we have a 5.4 meter design outside diameter, while drop back to the Atlas V size for the kerosene AR1 version.
  15. ^ Thunnissen, Daniel P.; Guernsey, C. S.; Baker, R. S.; Miyake, R. N. (2004). "Advanced Space Storable Propellants for Outer Planet Exploration" (PDF). American Institute of Aeronautics and Astronautics (4–0799): 28. Archived from the original (PDF) on 10 March 2016.
  16. ^ "Blue Origin BE-4 Engine". Archived from the original on 1 October 2021. Retrieved 14 June 2019. We chose LNG because it is highly efficient, low cost and widely available. Unlike kerosene, LNG can be used to self-pressurize its tank. Known as autogenous repressurization, this eliminates the need for costly and complex systems that draw on Earth's scarce helium reserves. LNG also possesses clean combustion characteristics even at low throttle, simplifying engine reuse compared to kerosene fuels.
  17. ^ a b c Foust, Jeff (11 September 2020). "ULA studying long-term upgrades to Vulcan". Archived from the original on 8 January 2024. Retrieved 4 March 2021. "ACES work has its fingerprints in our new version of Centaur, the Centaur 5 we're fielding with Vulcan. Those studies five, eight years ago certainly served us well, and it put us on a good path forward here for the evolution of our upper stages. We will continue to evolve our upper stage to meet the needs of the market going forward".
  18. ^ Jason Rhian (23 September 2015). "ULA selects Orbital ATK's GEM 63/63 XL SRBs for Atlas V and Vulcan boosters". Spaceflight Insider. Archived from the original on 11 January 2016. Retrieved 25 September 2015.
  19. ^ Cite error: The named reference ULA_tech_sheet2 was invoked but never defined (see the help page).
  20. ^ "Atlas V". United Launch Alliance. Retrieved 10 December 2022.
  21. ^ "Delta IV Launch Services User's Guide – June 2013" (PDF). United Launch Alliance. 4 June 2013. pp. 2–10, 5–3. Archived from the original (PDF) on 14 October 2013. Retrieved 31 October 2020.
  22. ^ Bruno, Tory [@torybruno] (30 August 2016). "@A_M_Swallow @ULA_ACES We intend to human rate Vulcan/ACES" (Tweet). Retrieved 30 August 2016 – via Twitter.
  23. ^ a b "Vulcan Centaur". ulalaunch.com. Archived from the original on 25 February 2021. Retrieved 3 March 2021.
  24. ^ a b "Vulcan Centaur Cutaway Poster" (PDF). ULA. Archived (PDF) from the original on 22 December 2022. Retrieved 25 September 2019.
  25. ^ "Vulcan Launch Systems User's Guide" (PDF). October 2023. Archived (PDF) from the original on 16 April 2024.
  26. ^ Space and Missile Systems (5 October 2018). "EELV LSA RFP OTA". Archived from the original on 3 February 2019. Retrieved 22 June 2019. table 10 of page 27
  27. ^ a b Foust, Jeff (11 September 2020). "ULA studying long-term upgrades to Vulcan". Space News. Archived from the original on 8 January 2024. Retrieved 7 July 2021.
  28. ^ Shalal, Andrea (21 May 2015). "Lockheed-Boeing rocket venture needs commercial orders to survive". Yahoo! News. Archived from the original on 23 July 2015.
  29. ^ a b Avery, Greg (16 October 2014). "ULA plans new rocket, restructuring to cut launch costs in half". Denver Business Journal. Archived from the original on 15 March 2017. Retrieved 14 November 2014. Cite error: The named reference "dbj20141016" was defined multiple times with different content (see the help page).
  30. ^ Erwin, Sandra (19 August 2021). "National security launch in transition as Space Force waits for Vulcan". Space News. Retrieved 16 June 2024.
  31. ^ a b Fleischauer, Eric (7 February 2015). "ULA's CEO talks challenges, engine plant plans for Decatur". Decatur Daily. Archived from the original on 12 June 2017. Retrieved 17 April 2015.
  32. ^ Ferster, Warren (17 September 2014). "ULA To Invest in Blue Origin Engine as RD-180 Replacement". SpaceNews. Archived from the original on 18 September 2014. Retrieved 17 April 2015.
  33. ^ a b Neal, Mihir (8 June 2020). "Vulcan on track as ULA eyes early – 2021 test flight to the Moon". Archived from the original on 9 June 2020. Retrieved 9 June 2020.
  34. ^ a b c Gruss, Mike (13 April 2015). "ULA's Vulcan Rocket To be Rolled out in Stages". SpaceNews. Retrieved 17 April 2015.
  35. ^ a b Ray, Justin (14 April 2015). "ULA chief explains reusability and innovation of new rocket". Spaceflight Now. Archived from the original on 17 April 2015. Retrieved 17 April 2015.
  36. ^ a b Gruss, Mike (10 March 2016). "ULA's parent companies still support Vulcan ... with caution". SpaceNews. Archived from the original on 8 January 2024. Retrieved 10 March 2016.
  37. ^ a b Erwin, Sandra (10 October 2018). "Air Force awards launch vehicle development contracts to Blue Origin, Northrop Grumman, ULA". SpaceNews. Archived from the original on 11 October 2018. Retrieved 28 July 2020.
  38. ^ a b Erwin, Sandra (25 March 2018). "Air Force stakes future on privately funded launch vehicles. Will the gamble pay off?". SpaceNews. Archived from the original on 21 August 2015. Retrieved 24 June 2018.
  39. ^ "Boeing, Lockheed Differ on Whether to Sell Rocket Joint Venture". THE Wall Street Journal. 10 September 2015. Archived from the original on 15 April 2017. Retrieved 12 September 2015.
  40. ^ Tribou, Richard (11 May 2018). "ULA chooses Aerojet Rocketdyne over Blue Origin for Vulcan's upper stage engine". Orlando Sentinel. Archived from the original on 13 May 2018. Retrieved 13 May 2018.
  41. ^ "United Launch Alliance Building Rocket of the Future with Industry-Leading Strategic Partnerships – ULA Selects Blue Origin Advanced Booster Engine for Vulcan Centaur Rocket System" (Press release). United Launch Alliance. 27 September 2018. Archived from the original on 6 October 2018. Retrieved 5 October 2018.
  42. ^ Johnson, Eric M.; Roulette, Joey (27 September 2018). "Jeff Bezos' Blue Origin to supply engines for Vulcan rocket". Reuters. Archived from the original on 28 September 2018. Retrieved 28 September 2018.
  43. ^ Foust, Jeff (25 October 2018). "ULA now planning first launch of Vulcan in 2021". SpaceNews. Archived from the original on 8 January 2024. Retrieved 11 November 2018.
  44. ^ @jeff_foust (18 January 2018). "Tom Tshudy, ULA: with Vulcan we plan to maintain reliability and on-time performance of our existing rockets, but at a very affordable price. First launch mid-2020" (Tweet) – via Twitter.
  45. ^ Foust, Jeff (25 October 2018). "ULA now planning first launch of Vulcan in 2021". Space News. Archived from the original on 8 January 2024. Retrieved 28 January 2023.
  46. ^ @ToryBruno (6 August 2019). "Mighty Atlas is not the only thing rolling at the Cape today. Check the new Vulcan MLP arrival" (Tweet) – via Twitter.
  47. ^ @ULAlaunch (6 August 2019). "The MLP will transport #VulcanCentaur Vertical Integration Facility to SLC-41 using heritage undercarriage dollies used for Titan III, Titan IV and #AtlasV and will move at 3 mph. #VulcanCentaur" (Tweet) – via Twitter.
  48. ^ "Three rockets depart factory aboard RocketShip". United Launch Alliance. 4 February 2021. Archived from the original on 5 February 2021. Retrieved 6 February 2021.
  49. ^ "Vulcan: Pathfinder fueling tests planned". blog.ulalaunch.com. Archived from the original on 7 April 2022. Retrieved 11 April 2022.
  50. ^ "Vulcan: First demonstration of launch day completed". blog.ulalaunch.com. Archived from the original on 14 April 2022. Retrieved 24 April 2022.
  51. ^ Chow, Denise (4 February 2023). "Bigger, faster, farther: A batch of new rockets is set to blast into space this year". NBC News. Archived from the original on 4 February 2023. Retrieved 14 February 2023.
  52. ^ "Astrobotic Selects United Launch Alliance Vulcan Centaur Rocket to Launch its First Mission to the Moon". ULA Launch. 19 August 2019. Archived from the original on 19 August 2019. Retrieved 19 August 2019.
  53. ^ Bezos' Blue Origin to deliver first flight-ready rocket engines next summer Archived 22 December 2020 at the Wayback Machine, Reuters, 17 December 2020, accessed 20 December 2020.
  54. ^ Weapon Systems Annual Assessment (PDF) (Report). US Government Accountability Office (GAO). 8 June 2021. p. 106. GAO-21-222. Archived (PDF) from the original on 24 June 2021. Retrieved 23 June 2021. ...a U.S. produced rocket engine under development for ULA's Vulcan launch vehicle is experiencing technical challenges related to the igniter and booster capabilities required and may not be qualified in time to support first launches beginning in 2021.
  55. ^ Irene Klotz [@Free_Space] (18 June 2021). "Debut launch of @ulalaunch Vulcan slipping to 2022 as customer @astrobotic needs more time to prep Peregrine lunar lander. "Covid presented a lot of problems for the entire space supply chain," CEO John Thornton tells @aviationweek "We're just doing the best we can."" (Tweet) – via Twitter.
  56. ^ Kanayama, Lee (9 May 2022). "As Centaur turns 60 years old, ULA prepares to evolve Centaur V". NASASpaceFlight.com. Archived from the original on 1 August 2023. Retrieved 29 May 2022.
  57. ^ Roulette, Joey (10 October 2022). "United Launch Alliance's debut Vulcan mission slips to 2023 -CEO". Reuters. Archived from the original on 10 October 2022. Retrieved 11 October 2022.
  58. ^ Foust, Jeff (24 June 2023). "First Vulcan launch further delayed for Centaur modifications". Spacenews. Archived from the original on 8 January 2024. Retrieved 24 June 2023.
  59. ^ Foust, Jeff (24 October 2023). "ULA sets Christmas Eve launch date for first Vulcan Centaur". SpaceNews. Archived from the original on 8 January 2024. Retrieved 24 October 2023.
  60. ^ McCrea, Aaron (8 January 2024). "Vulcan successfully launches Peregrine lunar lander on inaugural flight". NASASpaceFlight. Archived from the original on 8 January 2024. Retrieved 8 January 2024.
  61. ^ "Update #8 for Peregrine Mission One". Astrobotic. 9 January 2024. Archived from the original on 12 January 2024. Retrieved 12 January 2024.
  62. ^ "SNC Selects ULA for Dream Chaser® Spacecraft Launches: NASA Missions to Begin in 2021". ULA Launch. 14 August 2019. Archived from the original on 14 August 2019. Retrieved 14 August 2019.
  63. ^ "ULA Sets Dec. 24 As Target Date For Vulcan's Debut". Aviation Week Network (aviationweek.com). Archived from the original on 28 December 2023. Retrieved 11 January 2024.
  64. ^ Jeff Foust (5 January 2024). "Vulcan on the pad for its first launch". Spacenews. Retrieved 8 January 2024.
  65. ^ "Contracts for August 7, 2020". U.S. DEPARTMENT OF DEFENSE. Archived from the original on 20 September 2020. Retrieved 9 August 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  66. ^ Erwin, Sandra (20 May 2021). "With ULA's new rocket Vulcan behind schedule, Space Force agrees to let Atlas 5 fill in". SpaceNews. Archived from the original on 8 January 2024. Retrieved 22 May 2021.
  67. ^ Clark, Stephen (7 August 2023). "Amazon shifts launch of its first Internet satellites to Atlas V rocket". Ars Technica. Archived from the original on 7 August 2023. Retrieved 7 August 2023.
  68. ^ Erwin, Sandra (13 May 2024). "ULA could fly dummy payload on next Vulcan launch if Dream Chaser is delayed". SpaceNews. Retrieved 14 May 2024.
  69. ^ "Lockheed-Boeing Alliance Hit With US Fine for Launch Delays". www.bloomberg.com. Retrieved 15 May 2024.
  70. ^ Davenport, Christian (13 May 2024). "Pentagon worried its primary satellite launcher can't keep pace". Washington Post. ISSN 0190-8286. Retrieved 28 June 2024.
  71. ^ Decker, Audrey (26 June 2024). "ULA owners add 'review team' after Pentagon airs concerns about launch schedule". Defense One. Retrieved 28 June 2024.
  72. ^ a b c Henry, Caleb (20 November 2019). "ULA gets vague on Vulcan upgrade timeline". SpaceNews. Archived from the original on 8 January 2024. Retrieved 20 June 2020.
  73. ^ "America, meet Vulcan, your next United Launch Alliance rocket". Denver Post. 13 April 2015. Archived from the original on 17 April 2015. Retrieved 17 April 2015.
  74. ^ a b Erwin, Sandra (7 April 2021). "Bruno: The next big thing for ULA is a long-endurance upper stage". Space News. Archived from the original on 8 January 2024. Retrieved 7 July 2021.
  75. ^ a b c Klotz, Irene (20 July 2022). "ULA Refines Plan To Reuse Vulcan Rocket Engines". Aviation Week. Archived from the original on 21 July 2022. Retrieved 21 July 2022.
  76. ^ "The Space Review: A megaconstellation megadeal". www.thespacereview.com. Archived from the original on 14 April 2022. Retrieved 8 June 2022.
  77. ^ Bruno, Tory [@torybruno] (20 July 2020). "By demand of the Internet, here is the uncropped picture of the #MarsPerseverance flip flops. Just a model. Related to a routine, ongoing trade study. Nothing more" (Tweet) – via Twitter.
  78. ^ Foust, Jeff (11 September 2020). "ULA studying long-term upgrades to Vulcan". SpaceNews. Archived from the original on 8 January 2024. Retrieved 30 September 2020.
  79. ^ McCrea, Aaron (8 January 2024). "Vulcan successfully launches Peregrine lunar lander on inaugural flight". NASASpaceFlight. Retrieved 8 January 2024.
  80. ^ "The first US Moon landing in more than 50 years has hit a major hurdle after a 'critical' fuel leak". ABC News. 9 January 2024. Retrieved 9 January 2024.

External links[edit]

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