Long March 1D^[1][2][3][4]

Function	Orbitallaunch vehicle
Manufacturer	CALT
Country of origin	China
Size
Height	28.22 m (92.6 ft)
Diameter	2.25 m (7.4 ft)
Mass	81,650 kg (180,010 lb)
Stages	3
Capacity
Payload toLEO
Mass	930 kg (2,050 lb)
Associated rockets
Family	Long March 1
Comparable	Mu 1-3-4
Launch history
Status	Retired
Launch sites	TaiyuanLC-1
Total launches	3
Success(es)	2
Failure(s)	1
First flight	1 June 1995
Last flight	3 January 2002
Carries passengers or cargo	reentry vehicle tests
First stage
Height	18.20 m (59.7 ft)
Diameter	2.25 m (7.4 ft)
Empty mass	4,100 kg (9,000 lb)
Gross mass	65,000 kg (143,000 lb)
Propellant mass	61,100 kg (134,700 lb)
Powered by	1YF-2B (4 xYF-1B)[5]
Maximum thrust	SL: 1,101.2 kN (247,600 lbf) Vac: 1,214.4 kN (273,000 lbf)
Specific impulse	SL: 242.5 seconds (2.378 km/s) Vac: 267.4 seconds (2.622 km/s)
Burn time	131.5 seconds
Propellant	UDMH/N2O4
Second stage
Height	6.04 m (19.8 ft)
Diameter	2.25 m (7.4 ft)
Empty mass	1,620 kg (3,570 lb)
Gross mass	14,000 kg (31,000 lb)
Propellant mass	12,380 kg (27,290 lb)
Powered by	2YF-40[5]
Maximum thrust	98.1 kN (22,100 lbf)
Specific impulse	295.2 seconds (2.895 km/s)
Burn time	365 seconds
Propellant	UDMH/N2O4
Third stage
Height	1.7 m (5.6 ft)
Diameter	2.05 m (6.7 ft)
Empty mass	665 kg (1,466 lb)
Gross mass	1,315 kg (2,899 lb)
Propellant mass	Main: 650 kg (1,430 lb) RCS: 147 kg (324 lb)
Powered by	Main:FG-36SRM RCS: DaFY2-1monopropellant thrusters[5]
Maximum thrust	44 kN (9,900 lbf)
Specific impulse	289 seconds (2.83 km/s)
Burn time	43 seconds
Propellant	Main:HTPB/AP RCS:hydrazine
[edit on Wikidata]

TheLong March 1D was a member of China'sLong March rocket family. During the 1990sCALT developed an improved version of theDF-4 to test thereentry vehicle warheads of theDF-31.^[6][7][8] They took advantage of this development and offered it as theLong March 1D for commercial application. The modifications included:

• AnDF-4 improved first stage, which used the new version of theYF-2B, and switched propellants toUDMH/N₂O₄ for improved performance.
• The replacement of the DF-4 second stage motorYF-3A. The proposed replacement was theLong March 4 third stage engine, theYF-40.
• A new inline inter-stage would replace the existing tapered connector between the second and third stages, which allowed for an additional 70 cm diameter to be added to the third stage skirt. This would allow for the addition ofRCS to the third stage.
• A new third stage with a new motor, theFG-36 and an optional RCS.
• A new computer inertial guidance system which enabled the third stage to be 3-axis stabilised for added precision.^[1][3]

The new design did not have a good reception and was only used for reentry vehicle tests. It flew three suborbital missions fromTaiyuanLC-1 with two successes and a failure on the final mission. The first launch was on June 1, 1995 and the second one was in November 1997. The final and failed launch was on January 3, 2002.^[9][10][11]

• Data fromAerospace China magazine

• China Academy of Launch Vehicle Technology

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