Chang Zheng 3B / E launches ChinaSat 6D

China has successfully introduced the ChinaSat 6D satellite to geostationary transfer orbit via its Chang Zheng 3B / E rocket. The launch will begin at 12:05 UTC (20:05 local time) from Launch Complex 2 at the Xichang Satellite Launch Center.

The ChinaSat 6D satellite, also known as Zhongxing 6D, has been put into orbit by the China Academy of Launch Vehicle Technology (CALT). of the Chang Zheng 3B / E (CZ-3B / E) – or Long March 3B / E – rocket is the most powerful of the Chang Zheng 3 series of rockets used by China for most of its geostationary satellite launches.

ChinaSat 6D was developed by the state -owned China Academy of Space Technology and operated by China Satcom. Equipped with 25 C-band transponders, the satellite will provide users in China with high-bit rate uplink and downlink reliability for radio and television from its base at a longitude of 125 degrees East.

The satellite is used by two main types of solar panels that carry batteries on the ship. It is expected to be completed in about 15 years.

After being launched into geostationary transfer orbit (GTO), he will spend the first few months elevating himself to geostationary orbit (GEO) and testing in orbit.

ChinaSat 6D is in attendance (credit: China Satcom)

ChinaSat 6D will replace the ChinaSat 6A satellite, which was launched in September 2010 and was first seen as SinoSat-6. ChinaSat 6A is expected to remain in service until 2025; however, the life of the offender was shortened with its helium reduction system and required that a replacement be released sooner than planned.

Starting Friday will be the first to offer a new satellite for the constellation ChinaSat from the ChinaSat 6C spacecraft, launched on 3 September 2019, on a CZ-3B / E.

The Chang Zheng 3B / E is a new version of the three-level Chang Zheng 3B, with expansions with a larger and more powerful front-end and increased side boosters. The first platform was 24.76 meters long and 3.35 meters in diameter and was equipped with four YF-21C engines.

The YF-21C is a new version of the original YF-20C engine. An open engine that burns hypergolic propellants: unsymmetrical dimethylhydrazine (UDMH) propellant depleted by dinitrogen tetroxide (N2O4). Each engine emits about 740 kN of impact on the surface with a precision (isp) – a measure of its accuracy – of 259 seconds. In one fell swoop, the engines were able to deliver 820 kN of fuel with an isp of 289 seconds. To navigate the first level, each machine can gimbal at ten degrees.

Chang Zheng 3B before the merger (credit: Xie Qiyong)

Attached to the first level are four water pumps, each 16.1 meters long and 2.25 meters in diameter. A single YF -25 engine – a power of the YF -20 engine modified for the use of boosters – boosts each of the boosters, providing 740 kN of fuel for each. this booster with a specific focus of 260 seconds on the surface.

With the first two stages and four boosters firing the lift, the Chang Zheng 3B / E was boosted upwards by 5,920 kN of firing.

The second floor of Chang Zheng 3B / E is 12.92 meters long and 3.35 meters in diameter. Running together on N2O4 and UDMH, this stage is equipped with a single YF-24E engine assembly. This is equipped with one YF-22E main engine and four YF-23E vernier engines for roll, pitch, and yaw power.

The YF-22E is a powerful YF-20, producing about 820 kN of tank and the Vernier thrusters produce 47 kN of each.

To allow it to reach geostationary orbit, the CZ-3B / E uses a third process of hydrogen (LH2) and water oxygen (LOX). It is 12.38 meters long and 3.0 meters in diameter. Equipped with YF-75 open-cycle engines, the platform produces about 170 kN of fuel with 438 seconds of ISP and can burn up to 478 seconds.

CZ-3B on stage in Xichang before Friday’s mission (credit: Xie Qiyong)

The Chang Zheng 3B and 3B / E can fly in a four-phase system with a high level of hypergolic-propellant YZ-1. This can be used to create orbit circularization that directly inserts the satellites into their working orbit and was first used on missions carrying Beidou navigation satellites.

The launch of the ChinaSat 6D is the first of two China will make rapid progress, with another rocket – perhaps more than a Chang Zheng 4C – scheduled to be launched from the Taiyuan Satellite Launch Center at about 18 p.m. : 15 UTC.

(Photo credit: Chang Zheng 3B leaves Xichang)

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