Exploration Upper Stage: Difference between revisions
No edit summary Tags: Mobile edit Mobile app edit iOS app edit |
No edit summary Tags: Mobile edit Mobile app edit iOS app edit |
||
Line 5: | Line 5: | ||
| name = Exploration Upper Stage |
| name = Exploration Upper Stage |
||
| image = Exploration Upper Stage 2020 Design.png |
| image = Exploration Upper Stage 2020 Design.png |
||
| caption = 2020 |
| caption = 2020 design of the Exploration Upper Stage |
||
| image_size = 150px |
| image_size = 150px |
||
Revision as of 06:06, 18 May 2023
![]() 2020 design of the Exploration Upper Stage | |
Manufacturer | Boeing[1] |
---|---|
Country of origin | Vereinigte Staaten |
Used on | SLS Block 1B and Block 2[2] |
General characteristics | |
Height | no more than 18 m (59 ft) |
Diameter | 8.4 m (28 ft) |
Propellant mass | 278,000 lb (126,000 kg)[3] |
Empty mass | 31,110 lb (14,110 kg)[4] |
Engine details | |
Powered by | 4 RL10C-3[5] |
Maximum thrust | 433.1 kN (97,360 lbf) |
Specific impulse | 460.1 seconds (vacuum) |
Propellant | LOX / LH2 |
The Exploration Upper Stage (EUS) is a rocket stage under development that will be used for future flights of NASA's Space Launch System (SLS). Used on SLS Block 1B and Block 2, it will replace the SLS Block 1's Interim Cryogenic Propulsion Stage. The will be powered by four RL10C-3 engines burning liquid oxygen and liquid hydrogen to produce a total thrust of 433.1 kN (97,360 lbf). The EUS is expected to first fly on Artemis 4 in 2028.[6]
Development
The Block 1 configuration of SLS has a core stage powered by four RS-25 engines, two Space Shuttle-derived five-segment solid rocket boosters, and an Interim Cryogenic Propulsion Stage (ICPS) upper stage.[7][8]
NASA will develop the EUS to increase SLS performance for trans-lunar injection beyond Block 1 specifications. The improved upper stage was originally named the Dual Use Upper Stage (DUUS, pronounced "duce")[9], but was later renamed the Exploration Upper Stage (EUS) due to DUUS sounding like a profanity in Japanese.[10]
In 2014, NASA announced that it would proceed with development of Block 1B with the EUS[11] and would use it on EM-2.[12] In April 2016, it was reported that NASA has chosen to use a design based on four RL10-C3 engines for the EUS,[5] and in October 2016 NASA confirmed they had ordered 10 of the engines.[13]
In 2018, it was decided to optimise EUS for payload to lunar missions, by using smaller tanks.[14]
By February 2020, the development contract for EUS had been delayed, and NASA was planning to use ICPS for the first three launches of SLS.[15]
Boeing announced on 21 December 2020 that the Exploration Upper Stage (EUS) of the SLS completed a critical design review (CDR) with NASA. That review confirmed the design of the EUS, allowing Boeing to proceed with development of the stage, including hardware fabrication.[16]
In March 2022, Boeing revealed plans for an all-composite variant of the EUS, as well as the successful results of pressure tests done on a prototype. The variant was projected to save enough mass to increase the SLS's trans-lunar injection performance by 30 percent.[17]
Funding history[needs update]
Fiscal year | Nominal
(millions) |
In 2021[18](millions) |
---|---|---|
2016 | $77.0 | $84.8 |
2017 | $300.0[19] | $324.3 |
2018 | $300.0[20] | $316.5 |
2019 | $150.0[21] | $155.1 |
2020 | $300.0 | $303.9 |
2021 | $400.0[note 1] | $400.0 |
Total: 2016–2021 | $1,527.0 | $1,584.6 |
Cost concerns and alternatives
Due to the possible cost of EUS (about US$800 million each), NASA invited proposals for alternatives, but in May 2019 rejected Blue Origin's proposal.[22] NASA ordered eight EUSs from Boeing.[22]
See also
Notes
- ^ The FY2021 spending plan indicates that this is for "Block 1B (non-add) (including EUS)"
References
- ^ "NASA, Boeing Finalize US$2.8 billion SLS Core Stage Contract". SpaceNews. 4 July 2014. Archived from the original on 27 July 2014. Retrieved 25 July 2014.
- ^ "Space Launch System Fact Sheet" (PDF). NASA. Retrieved 16 May 2023.
- ^ |https://arc.aiaa.org/doi/pdf/10.2514/6.2018-4639
- ^ |https://arc.aiaa.org/doi/pdf/10.2514/6.2018-4639
- ^ a b "RL10 Engine". Aerojet Rocketdyne. Archived from the original on 7 November 2021. Retrieved 18 November 2021.
- ^ Foust, Jeff (30 October 2022). "Lunar landing restored for Artemis 4 mission". SpaceNews. Retrieved 31 October 2022.
- ^ "SLS". Gunter's Space Page. Retrieved 25 July 2014.
- ^ "Space Launch System Data Sheet". SpaceLaunchReport.com. Retrieved 25 July 2014.
- ^ "SLS prepares for PDR – Evolution eyes Dual-Use Upper Stage". NASASpaceflight.com. June 2013. Retrieved 25 July 2014.
- ^ Bergin, Chris (28 March 2014). "SLS positioning for ARRM and Europa missions". NASASpaceflight.com. Retrieved 8 November 2014.
- ^ Bergin, Chris (30 July 2012). "Wind Tunnel testing conducted on SLS configurations, including Block 1B". NASASpaceFlight.com. Retrieved 12 March 2015.
- ^ "NASA confirms EUS for SLS Block IB design and EM-2 flight". NASASpaceflight.com. 6 June 2014. Retrieved 25 July 2014.
- ^ "Proven Engine Packs Big, In-Space Punch for NASA's SLS Rocket". NASA. 21 October 2016. Retrieved 18 November 2021.
- ^ NASA completes Exploration Upper Stage CDR, focuses new office on SLS Block 1B development. Feb 2021.
- ^ Upper Stage RL10s arrive at Stennis for upcoming SLS launches. February 2020.
- ^ "SLS Exploration Upper Stage passes review". SpaceNews. 22 December 2020. Retrieved 22 December 2020.
- ^ Gebhardt, Chris (5 March 2022). "With all-composite cryogenic tank, Boeing eyes mass-reducing space, aviation applications". Archived from the original on 7 March 2022. Retrieved 18 May 2023.
- ^ "NASA FY20 Inflation Tables – to be utilized in FY21". NASA. p. Inflation Table. Retrieved 11 October 2021.
This article incorporates text from this source, which is in the public domain.
- ^ "NASA outlines plan for 2024 lunar landing". SpaceNews. 1 May 2019. Archived from the original on 30 September 2021. Retrieved 15 May 2019.
- ^ Berger, Eric (20 May 2019). "NASA's full Artemis plan revealed: 37 launches and a lunar outpost". Ars Technica. Archived from the original on 23 May 2019. Retrieved 20 May 2019.
- ^ Sloss, Philip (18 December 2019). "Amid competing priorities, Boeing redesigns NASA SLS Exploration Upper Stage". NASASpaceFlight.com. Archived from the original on 7 August 2020. Retrieved 25 July 2020.
- ^ a b NASA rejects Blue Origin's offer of a cheaper upper stage for the SLS rocket May 2019