All layouts of the solid boosters are symmetrical. The second digit indicates the number of SRB-3 solid rocket boosters attached to the base of the rocket, and can be "0", "2" or "4". The first digit represents the number of LE-9 engines on the main stage, either "2" or "3".
H3 CAR PLUS
Variants Įach H3 booster configuration has a two-digit plus letter designation that indicates the features of that configuration. The propellant mass of the second stage is 23 metric tons. The second stage is powered by a single engine which is an improved LE-5B. The fuel and oxidizer mass of the first stage is 225 metric tons. The first stage is powered by two or three LE-9 engines which uses an expander bleed cycle design similar to the LE-5B engine. The first stage uses liquid oxygen and liquid hydrogen as propellants and carries zero, two or four strap-on solid rocket boosters (SRBs) (derived from SRB-A) using polybutadiene fuel. The H3 Launch Vehicle is a two-stage launch vehicle. On 21 January 2022, the launch of the first H3 was rescheduled to 2022 or later, citing technical problems regarding the first stage engine. In earlier plans, the first H3 was to be launched in fiscal year 2020 in the H3-30 configuration (which lacks solid-rocket boosters), and in a later configuration with boosters in FY2021. In August 2018, the first tests of the solid rocket boosters were carried out. įiring tests of the LE-9 first-stage engine began in April 2017. However, it is physically difficult for an expander bleed cycle engine to generate large thrust, so the development of the LE-9 engine with a thrust of 1,471 kN (331,000 lb f) is the most challenging and important development element. The expander bleed cycle used in the LE-9 engine is a highly reliable combustion method that Japan has put into practical use for the LE-5A/ B engine. The newly developed LE-9 engine is the most important factor in achieving cost reduction, improved safety and increased thrust. The main emphasis in design is cost reduction, with planned launch costs for customers in the range of US$50-65 million. JAXA and Mitsubishi Heavy Industries were in charge of preliminary design, the readiness of ground facilities, development of new technologies for the H3, and manufacturing. The H3 was designed with cheaper engines compared to the H-IIA, so that manufacturing the new launch vehicle would be faster, less risky, and more cost-effective. The H3 Launch Vehicle is being jointly developed by JAXA and Mitsubishi Heavy Industries (MHI) to launch a wide variety of commercial satellites. The development of the H3 was authorized by the Japanese government on. The first H3 is planned to be launched in 2022 or later. The H3-24 variant will deliver more than 6,000 kg (13,000 lb) of payload to lunar transfer orbit (TLI). Īs of July 2015, the minimum configuration is to carry a payload of up to 4,000 kg (8,800 lb) into Sun-synchronous orbit (SSO) for about 5 billion yen, and the maximum configuration is to carry more than 6,500 kg (14,300 lb) into geostationary transfer orbit (GTO). The H3 is the world's first rocket to use an expander bleed cycle for the first stage engine. Mitsubishi Heavy Industries (MHI) and JAXA are responsible for the design, manufacture, and operation of the H3. H3 launch vehicles are liquid-propellant rockets with strap-on solid rocket boosters and are planned to be launched from Tanegashima Space Center in Japan. The H3 Launch Vehicle is an expendable launch system in development in Japan.
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