Subj : LandSpace tries to close the methane race in second ZhuQue-2 launch To : All From : NasaSpaceFlight Date : Tue Jul 11 2023 20:45:03 LandSpace tries to close the methane race in second ZhuQue-2 launch Date: Tue, 11 Jul 2023 19:34:10 +0000 Description: LandSpace plans to launch its methane-based ZhuQue-2 rocket on Wednesday. According to notice to airmen, The post LandSpace tries to close the methane race in second ZhuQue-2 launch appeared first on NASASpaceFlight.com . FULL STORY ====================================================================== LandSpace plans to launch its methane-based ZhuQue-2 rocket on Wednesday. According to notice to airmen, the launch window will open at 00:53 AM UTC and stay open until 03:14 AM UTC. This will be the rockets second launch after its failed maiden flight in December 2022. Based on the first flight, the company will likely target liftoff around 01:00 AM UTC, just after the windows opening. The ZhuQue-2roc ket ZhuQue-2 (Redbird 2 in English) is a rocket designed by the Chinese private company LandSpace. It stands 49.5 meters tall with a rocket body diameter of 3.35 meters. The medium-sized launch vehicle has a carrying capacity of up to six tons into a 200-kilometer low-Earth orbit and up to four tons into a 500-kilometer Sun-synchronous orbit (SSO). One focus of the development of ZhuQue-2 was green and economically viable methane. According to the LandSpace website, the price of propellant was reduced by 50-90%, comparable to similar Chinese launchers. Furthermore, methane allows for a non-toxic, less-polluting, and more modern approach to fuel the rocket, compared to the hypergolics of the early Chang Zheng family. ZQ-2 on the pad. (Credit: LandSpace) Also, ZhuQue-2 utilizes standardization and generalization across the whole rocket. The rocket is made out of off-the-shelf parts when possible, and with that, LandSpace could reduce the cost of the whole stack even further. The first stage, which features the rockets characteristic red bird, is powered by four TQ-12 liquid methane-liquid oxygen (methalox) engines. These are Chinas first methane engines used on a launch vehicle. They are gas generator open-cycle engines, which are simpler than other new methalox engines, such as SpaceXs Raptor or Blue Origins BE-4. When combined, four TQ-12 engines are referred to as a TQ-13 engine pack. See Also Zhuque-2 Updates China Forum Section L2 Resources Click here to Join L2 At liftoff, these engines produce a thrust of 268 tons. The whole stack has a mass of 219 tons, which brings the overall thrust-to-weight ratio to 1.22. The engines have a nozzle diameter of 1.5 meters and operate on a mixture ratio of 3.5 parts oxygen to methane by mass. The specific impulse at sea level is 284.5 seconds. The engines were initially fired in May 2019 in preparation to certify them for the maiden flight. Down the line, LandSpace plans to develop this engine into the TQ-12A, providing improved thrust, specific impulse, and mass efficiency. In the second stage, the rocket still features a TQ-12 engine, assisted by four TQ-11 vernier engines. This will change in one of the upcoming flights with the upgrade to the TQ-15A engine, providing gimbal capabilities and deleting the vernier engines. Four TQ-12 engines at the bottom of ZQ-2. (Credit: LandSpace) After the second stage burn is done, the final insertion burn will only be done by the TQ-11 vernier engines. While the main chamber shuts down, the four verniers will bring the rocket into the final orbit using a more precise thrust. The first stage of the rocket will also feature reusability in the future. While this is not a topic that LandSpace has detailed so far, it was confirmed that the first stage TQ-12A engine will be built with multiple relights in mind, which is required for a reusable first stage if the company desires to land it propulsively. Leading up to launch The first signs of an imminent launch campaign were sightings by Harry Stranger, who used satellite imagery to see that the pathfinder rocket was back on LandSpaces Launch Site 96. This ZhuQue-2 pathfinder was used in the past for fit checks of the transporter and pad and hinted at a return of the rocket shortly. https://twitter.com/Cosmic_Penguin/status/1657033103771041792 In mid-May, LandSpace showed pictures of the rockets 3,700-kilometer journey through China to the pad. This transport is also why the common diameter of Chinese rockets, including ZhuQue-2, is about 3.5 meters. Anything bigger than that would limit the rockets ability to be transported on roads and trains. After an initial rollout was spotted in early June, the rocket was soon rolled back to the hangar, presumably because of a second stage release pin malfunction during the third full pre-launch test. High resolution satellite imagery taken on 2023-07-09 at 00:36:51 UTC shows Landspace's Zhuque-2 flight 2 rocket standing vertical on its launch pad at Jiuquan SLC. As always I've uploaded the full image to @Soar_Earth for interactive browsing: https://t.co/GO42tZOruo pic.twitter.com/BesbsezaOh Harry Stranger (@Harry__Stranger) July 9, 2023 LandSpace then confirmed the rollout and raising of the rocket in a video posted on Chinese social media at the beginning of July. Since then, the vehicle has been sitting vertically on Launch Site 96 at the Jiuquan Satellite Launch Center in China. ZhuQue-2s second flight payloads So far, the payload for this launch is currently unknown. It is unclear if LandSpace got another payload on this rocket after the initial maiden flight or if they are flying a dummy payload for this mission. Regardless, the payload fairing is on top of the rocket so that the rocket will fly in a comparable configuration to a normal operational flight. This missions mission patch also focuses on the rocket and gives no clues about a potential payload. On the rockets site, the flights motto bringing green energy to life has been released. ZQ-2s maiden flight failure ZQ-2 lifts off for the first time. (Credit: LandSpace) In an investigation report months ago, LandSpace detailed the problems of the first flight. A liquid oxygen (LOX) pump low-pressure outer casting for the second stage vernier engine broke under impact force from the second stage main engine shutdown. During that moment, the rocket was already traveling at five kilometers per second according to telemetry shown on Chinese social media. With that, it lacked about two kilometers per second to reach orbit successfully. This was during the event in which the second stage would shut down and let the four verniers take the rest of the flight. During this time, a connection at the LOX inlet pipe broke, which was not properly designed for the shutdown. LandSpace conducted a series of ground tests, reinforcing the failures culprit. This will be the last flight of the TQ-12 upper-stage combination. After flight two, the enhanced TQ-15A will take over, eliminating the problem. The first stage on the maiden flight, including the four TQ-12 engines, performed flawlessly. The methane race to orbit So far, no methane-based rocket has reached orbit. After ZhuQue-2 failed the first attempt in late 2022, both Starship and Relativity Spaces Terran-1 did not complete their mission profiles for their maiden launch. Currently, Starship, ULAs Vulcan, and ZQ-2 by LandSpace are still in the race, as Relativity Space will no longer pursue Terran-1 operations. Other methane rockets, such as Blue Origins New Glenn and Terran-R by Relativity Space, are not expected to fly anytime soon. Due to chemistry and engineering challenges, methane rockets have not been strongly considered throughout spaceflight history. But with green propellants and reusability being more in focus, methane suddenly shows advantages over traditional fuels. A BE-4 engine by Blue Origin fired on a test stand. (Credit: Blue Origin) One of the main challenges of methane is combustion stability, as the boiling point of methane is very close to that of its oxidizer. Hence, the state of matter that both the oxygen and methane molecules are in during the combustion is less evident than it is with hydrogen or rocket propellant 1 (RP-1). This can lead to instability in the pre-burners and main chambers. Another important factor is the increasingly economical race to build cheaper rockets. Methane is the cheapest of the three more traditional fuels, beating RP-1 and hydrogen. Especially with reusable rockets, fuel cost is a much more important factor in the overall economy. Reducing fuel prices can bring huge advantages. One final advantage of methane over RP-1 is that it lacks the problem of coking. Since RP-1 does not burn clean, it leaves other substances behind that get stuck on the nozzle and can clog the engine plumbing over time. While this has not been a problem with only once-used rockets, it can be a challenge for reusable rockets of the future. The company LandSpace LandSpace was founded in June 2015, and its first developed rocket was the ZhuQue-1. The rocket was planned to be a three-stage solid-propellant rocket and performed its maiden flight in October 2018. After this flight, the company entirely moved to develop ZhuQue-2, their medium-lift carrier rocket. Rumors about LandSpaces difficult financial situation have appeared in the last few weeks. Hence, the flight of ZhuQue-2 could become an important milestone in the companys future, as they could aspire to absorb the market of medium-sized SSO payloads currently covered by early-generation Chang Zheng rockets. (Lead image: ZQ-2 flight 2 on the pad. Credit: LandSpace) The post LandSpace tries to close the methane race in second ZhuQue-2 launch appeared first on NASASpaceFlight.com . ====================================================================== Link to news story: https://www.nasaspaceflight.com/2023/07/zhuque-2-launch2/ --- Mystic BBS v1.12 A47 (Linux/64) * Origin: tqwNet Science News (1337:1/100) .