Long March 4B

Long March 4B is a China-developed launch vehicle used for launching satellites and other spacecraft into low Earth orbit and sun-synchronous orbit. The Long March 4B is a member of the Long March rocket family, which has been used for numerous space missions including the Tiangong space station and the Chang'e 4 lunar mission. The China National Space Administration (CNSA) and the China Academy of Launch Vehicle Technology (CALT) have been involved in the development and operation of the Long March 4B. The Long March 4B has been launched from the Taiyuan Satellite Launch Center and the Jiuquan Satellite Launch Center.

Introduction

The Long March 4B is a three-stage launch vehicle that uses a combination of liquid-fueled rocket engines and solid rocket boosters to achieve orbit. The Long March 4B is capable of launching payloads of up to 2,800 kilograms into low Earth orbit and 1,500 kilograms into sun-synchronous orbit. The China National Space Administration (CNSA) has used the Long March 4B to launch numerous satellites and spacecraft, including the Fengyun weather satellites, the ZY-1 Earth observation satellite, and the Shijian spacecraft. The Long March 4B has also been used to launch international space missions, such as the Sino-Brazilian Earth Resources Satellite (CBERS) program, which is a collaboration between China and Brazil.

Design and Development

The Long March 4B was developed by the China Academy of Launch Vehicle Technology (CALT) and is based on the Long March 4 launch vehicle. The Long March 4B uses a YF-21B rocket engine in its first stage, which is powered by unsymmetrical dimethylhydrazine (UDMH) and nitrogen tetroxide (NTO). The second stage uses a YF-24B rocket engine, which is also powered by UDMH and NTO. The third stage uses a YF-40 rocket engine, which is powered by UDMH and NTO. The Long March 4B also uses a solid rocket booster to provide additional thrust during launch. The Long March 4B has undergone several upgrades and improvements, including the development of a new fairing and a more efficient guidance system. The China Aerospace Science and Technology Corporation (CASC) has been involved in the development and production of the Long March 4B.

Launch History

The Long March 4B has been launched numerous times since its maiden flight in 1999. The Long March 4B has been launched from the Taiyuan Satellite Launch Center and the Jiuquan Satellite Launch Center. The Long March 4B has been used to launch a variety of satellites and spacecraft, including the Fengyun weather satellites, the ZY-1 Earth observation satellite, and the Shijian spacecraft. The Long March 4B has also been used to launch international space missions, such as the Sino-Brazilian Earth Resources Satellite (CBERS) program. The China National Space Administration (CNSA) has worked with other space agencies, such as the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA), to launch joint space missions. The Long March 4B has been launched in conjunction with other launch vehicles, such as the Ariane 5 and the Atlas V.

Vehicle Specifications

The Long March 4B has a height of 45.8 meters and a diameter of 3.35 meters. The Long March 4B has a mass of 248,000 kilograms and is capable of launching payloads of up to 2,800 kilograms into low Earth orbit and 1,500 kilograms into sun-synchronous orbit. The Long March 4B uses a combination of liquid-fueled rocket engines and solid rocket boosters to achieve orbit. The Long March 4B has a thrust of 3,256 kilonewtons and a specific impulse of 300 seconds. The Long March 4B is guided by a inertial guidance system and uses a radio command system for telemetry and command. The China Academy of Launch Vehicle Technology (CALT) has developed the Long March 4B in collaboration with other institutions, such as the Harbin Institute of Technology and the Beijing University of Aeronautics and Astronautics.

Notable Missions

The Long March 4B has been used to launch numerous notable missions, including the Fengyun weather satellites, the ZY-1 Earth observation satellite, and the Shijian spacecraft. The Long March 4B has also been used to launch international space missions, such as the Sino-Brazilian Earth Resources Satellite (CBERS) program. The Long March 4B has been used to launch satellites for the Chinese Academy of Sciences, the China Meteorological Administration, and the State Oceanic Administration. The Long March 4B has also been used to launch spacecraft for the European Space Agency (ESA) and the National Aeronautics and Space Administration (NASA). The China National Space Administration (CNSA) has worked with other space agencies to launch joint space missions, such as the Double Star mission, which was a collaboration between China and the European Space Agency (ESA). The Long March 4B has been launched in conjunction with other launch vehicles, such as the Ariane 5 and the Atlas V, to launch satellites and spacecraft for international space missions.

Category:Spaceflight