Summary
Archimedes is a liquid-fuel rocket engine burning liquid oxygen and liquid methane in an oxidizer-rich staged combustion cycle.[2][3] It is designed by aerospace company Rocket Lab for its Neutron rocket.[1][2]
| Country of origin | United States New Zealand |
|---|---|
| Designer | Rocket Lab |
| Manufacturer | Rocket Lab |
| Application | First- and second-stage engine [1] |
| Status | In development |
| Liquid-fuel engine | |
| Propellant | LOX / liquid methane[1] |
| Cycle | ORSC[2][3] |
| Configuration | |
| Chamber | 1 |
| Performance | |
| Thrust, vacuum | 200,000 lbf (890 kN) (Vacuum version)[2] |
| Thrust, sea-level | 165,000 lbf (730 kN) [2] |
| Throttle range | 100% - 50% |
| Specific impulse, vacuum | 329s (SL) 365s (Vac version)[2] |
| Burn time | multiple[3] |
| Used in | |
| Neutron | |
| References | |
| References | [2][3] |
History edit
Archimedes was presented on December 2, 2021, in a webcast by Rocket Lab CEO Peter Beck.[4] It was presented as a fully reusable, gas generator engine using LOX and methane as propellant, a departure from the company's previous Rutherford, which is electrically pump fed. He then stated that it had a thrust of 1 MN (220,000 lbf) and 320 seconds of specific impulse. The same day, the Neutron page on Rocket Lab's website was updated specifying the thrust of the seven Archimedes used on the first stage as 5,960 kN (1,340,000 lbf) at sea level and a maximum thrust of 7,530 kN (1,690,000 lbf) and the upper stage's single vacuum optimized Archimedes at 1,110 kN (250,000 lbf). It is expected to have its first hot-fire test during 2022.[5]
In an interview published on CNBC website, Mr. Beck stated that Archimedes would be manufactured in New Zealand and its very simple design had "all the things you want when you have to build an engine that can be reused over and over again.”[6] In the September 21st, 2022 Investor Day Presentation, the engine design had changed to an oxidizer-rich staged combustion cycle.[2] The presentation stated that the sea level version would have a maximum thrust of 730 kN (160,000 lbf) with an isp of 329s and would be able to throttle to a 50% of maximum thrust.
Meanwhile, the vacuum optimized version, would have a maximum thrust of 890 kN (200,000 lbf), an isp of 367s and the same throttling capabilities of 50% of maximum thrust.[2][3] It was also implied, but not confirmed, that the engine would be built in the Virginia, USA factory. It was disclosed they would use the Stennis Space Center A-3 Test stand for development testing. They expected to start preburner testing in that or following quarter, hopefully starting full engine testing at Stennis before 2023 ends, and hoped to be able to launch in 2024.[3]
Design edit
Archimedes is presented as a highly reusable liquid-propellant engine using methane and liquid oxygen in an oxidizer-rich staged combustion cycle.[2][3] There are both sea-level and vacuum variants. The engine is mostly 3D printed,[7] with some of the biggest 3D printers in the world. The rationale for the cycle change from the original gas generator was that they could not get the performance they needed through all the throttle points that a reusable rocket needs, without pushing the turbine temperature and other factors beyond their preset limits. By changing to the higher performing cycle but with lower performance requirements, they were able to lower temperatures and other stress factors and increase margins everywhere, making reusability much more attainable.[3]
See also edit
References edit
- ^ a b c "Neutron Rocket Lab". Rocket Lab. 2021-12-02. Archived from the original on 2021-12-02. Retrieved 2021-12-02.
- ^ a b c d e f g h i j "2022 Inverstor Day and Neutron Update" (PDF). Rocket Lab. 2022-09-21. Archived from the original (PDF) on 2022-09-22. Retrieved 2022-09-22.
- ^ a b c d e f g h Rocket Lab 2022 Investor Day & Neutron Update (YouTube video). Rocket Lab. 2022-09-21. Retrieved 2022-09-22.
- ^ Neutron Rocket - Major Development Update (YouTube video). Rocket Lab. 2021-12-02. Retrieved 2021-12-02.
- ^ Gebhardt, Chris (2021-12-02). "Neutron switches to methane/oxygen, 1 Meganewton Archimedes engine revealed". NASA SpaceFlight. Archived from the original on 2021-12-02. Retrieved 2021-12-02.
- ^ Sheetz, Michael (2021-12-02). "Neutron Rocket Lab". CNBC. Archived from the original on 2021-12-02. Retrieved 2021-12-02.
- ^ "With Senior Advisor to Californian Governor Gavin Newsom, Dee Dee Myers and Rocket Lab 's Peter Beck at Rocket Lab's Long Beach facility. Had a thorough discussion about more opportunities for business between New Zealand and California & how much better we are working together". 12 April 2024.
External links edit
- Rocket Lab Neutron Rocket