Overview
The Long March 2D (Chinese: 长征 2D, pinyin: Chángzhēng 2D), also designated CZ‑2D, is a two‑stage, liquid‑propellant orbital launch vehicle developed by the China Academy of Launch Vehicle Technology (CALT). It belongs to the Long March family of rockets and is primarily used to place payloads into low‑Earth orbit (LEO) and Sun‑synchronous orbit (SSO). All launches have been conducted from Launch Area 2 at the Jiuquan Satellite Launch Center (JSLC) in the Gobi Desert.
Development and Service History
- First flight: 2 September 1992.
- Operational status: Active; the vehicle has been employed for a wide range of scientific, commercial, and governmental satellites.
- Number of launches (as of 2023): Over 80, with a success rate exceeding 95 %.
Technical Description
| Parameter | Details |
|---|---|
| Configuration | Two‑stage launch vehicle; no strap‑on solid boosters. |
| First stage | Four YF‑20 engines (each ~67 kN thrust), burning nitrogen tetroxide (N₂O₄) and unsymmetrical dimethylhydrazine (UDMH). |
| Second stage | Single YF‑22 engine, also using N₂O₄/UDMH. |
| Length | Approximately 31.4 m (103 ft). |
| Diameter | 3.35 m (11 ft). |
| Launch mass | Roughly 203 t (447 000 lb). |
| Payload capacity | • ~3 500 kg to a 700 km circular LEO. • ~2 000 kg to an 800 km Sun‑synchronous orbit. |
| Guidance | Inertial guidance system with optional satellite‑based augmentation for precise orbit insertion. |
| Fairing | Standard 3.35 m diameter payload fairing; compatible with a wide range of satellite bus sizes. |
Launch Record Highlights
- Early missions (1990s): Deployment of Earth‑observation and remote‑sensing satellites for the Chinese government.
- 2000s–2010s: Increased commercial usage, including launches for international customers (e.g., remote‑sensing constellations).
- Recent missions (2020–2023): Continued placement of scientific payloads, small‑satellite clusters, and technology demonstrators into SSO and LEO.
Operational Use
The Long March 2D is favored for missions requiring moderate payload mass to LEO/SSO with a reliable, cost‑effective launch solution. Its exclusive use of hypergolic propellants simplifies ground operations and provides a stable ignition profile for multiple restarts during the second‑stage flight, supporting precise orbital insertion.
Reliability and Significance
With a launch record of more than 80 flights and a high success ratio, the Long March 2D is regarded as one of the most dependable members of the Long March family. Its performance has contributed substantially to China’s capability to field large numbers of Earth‑observation satellites and to offer competitive launch services for regional and international satellite operators.
