Delta 4000

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Delta 4000
Delta 4925.jpg
Launch of a Delta 4925
Function Launch vehicle
Manufacturer McDonnell Douglas
Country of origin United States
Cost per launch US$34.22 million in 1985 (4925 variant)[1] (US$79.99 million in 2018)
Height 34 m (112 ft)
Diameter 2.44 m (8 ft 0 in)
Mass 200,740 kg (442,560 lb)
Stages 2 or 3
Payload to LEO 3,400 kg (7,500 lb)
Payload to GTO 1,200 kg (2,600 lb)
Associated rockets
Family Delta
Comparable Delta 5000, Delta II
Launch history
Status Retired
Launch sites Cape Canaveral SLC-17
Vandenberg AFB SLC-2W
Total launches 2
Successes 2
First flight 28 August 1989
Last flight 12 June 1990
Boosters – Castor 4A
No. boosters 9
Length 9.12 m (29.9 ft)
Diameter 1.02 m (3 ft 4 in)
Empty mass 1,529 kg (3,371 lb)
Gross mass 11,743 kg (25,889 lb)
Motor Solid
Thrust 478.3 kN (107,500 lbf)
Specific impulse
    • Sea level: 237 seconds
    • Vacuum: 266 seconds
Burn time 56 s
First stage – Thor/Delta ELT
Length 22.4 m (73 ft)
Diameter 2.44 m (8 ft 0 in)
Empty mass 4,059 kg (8,949 lb)
Gross mass 84,067 kg (185,336 lb)
Engines 1 MB-3
Thrust 760.6 kN (171,000 lbf)
Specific impulse
    • Sea level: 250 seconds
    • Vacuum: 285 seconds
Burn time 222 s
Fuel LOX / RP-1
Second stage – Delta K
Length 5.89 m (19.3 ft)
Diameter 2.44 m (8 ft 0 in)
Empty mass 950 kg (2,090 lb)
Gross mass 6,954 kg (15,331 lb)
Engines 1 AJ10-118K
Thrust 43.6 kN (9,800 lbf)
Specific impulse 319 s
Burn time 431 s
Fuel N
/Aerozine 50
Third stage – PAM-D (optional)
Length 2.03 m (6 ft 8 in)
Diameter 1.25 m (4 ft 1 in)
Empty mass 128 kg (282 lb)
Gross mass 2,137 kg (4,711 lb)
Motor Star 48B
Thrust 66 kN (15,000 lbf)
Specific impulse 286 s
Burn time 87 s

The Delta 4000 series was an American expendable launch system which was used to conduct two orbital launches in 1989 and 1990. It was a member of the Delta family of rockets. Although several variants were put forward, only the Delta 4925 was launched. The designations used a four digit numerical code to store information on the configuration of the rocket. It was built from a combination of spare parts left over from earlier Delta rockets, which were being retired, and parts from the Delta II 6000-series, which was just entering service.

The first stage was the MB-3-III powered Extended Long Tank Thor, previously flown on the 1000-series. Nine Castor-4A solid rocket boosters were attached to increase thrust at lift-off, replacing the less powerful Castor-4 boosters used on the 3000 series. The Delta-K was used as a second stage. A Star-48B PAM-D was used as a third stage, to boost payloads into geosynchronous transfer orbit.

Both Delta 4000 launches occurred from Launch Complex 17B at Cape Canaveral. The first launched Marco Polo 1 for BSkyB, and the second launched INSAT 1D for the Indian Space Research Organisation. Both were successful.


  • Wade, Mark. "Delta". Encyclopedia Astronautica. Archived from the original on 2008-07-24. Retrieved 2009-02-15.
  • Krebs, Gunter. "Thor family". Gunter's Space Page. Retrieved 2009-02-15.
  • Wade, Mark. "Delta 4000". Encyclopedia Astronautica. Retrieved 2018-09-08.
  1. ^ "Delta 4000". Retrieved September 8, 2018.
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