Delta 4000

{{about|the rocket designated Delta 4000 under the old designation system|the new system|Delta IV}}

{{Infobox Rocket

|image = Delta 4925.jpg

|caption = Launch of a Delta 4925

|name = Delta 4000

|function = Launch vehicle

|manufacturer = McDonnell Douglas

|country-origin = United States

|pcost =

|cpl = {{US$|34.22 million}} in 1985 (4925 variant){{cite web |url= http://www.astronautix.com/d/delta4000.html |archive-url= https://web.archive.org/web/20160916222512/http://www.astronautix.com/d/delta4000.html |url-status= dead |archive-date= September 16, 2016 |title= Delta 4000 |access-date= September 8, 2018}}

|alt-cpl = {{US$|79.99 million}} in 2018

|height = {{convert|34|m|abbr=on}}

|diameter = {{convert|2.44|m|abbr=on}}

|width =

|mass = {{convert|200,740|kg|abbr=on}}

|stages = 2 or 3

|capacities =

{{Infobox rocket/payload

|location = LEO

|kilos = {{convert|3,400|kg|abbr=on}}

}}

{{Infobox rocket/payload

|location = GTO

|kilos = {{convert|1,200|kg|abbr=on}}

}}

|family = Delta

|derivatives =

|comparable = Delta 5000, Delta II

|status = Retired

|sites = Cape Canaveral SLC-17
Vandenberg AFB SLC-2W

|launches = 2

|success = 2

|other_outcome =

|first = 28 August 1989

|last = 12 June 1990

|only =

|payloads =

|stagedata =

{{Infobox rocket/stage

|type = booster

|diff =

|stageno =

|name = Castor 4A

|number = 9

|length = {{convert|9.12|m|abbr=on}}

|diameter = {{convert|1.02|m|abbr=on}}

|width =

|empty = {{convert|1,529|kg|abbr=on}}

|gross = {{convert|11,743|kg|abbr=on}}

|propmass =

|engines = Solid

|solid = yes

|thrust = {{convert|478.3|kN|abbr=on}}

|total =

|SI = {{plainlist|

• Sea level: 237 seconds
• Vacuum: 266 seconds

}}

|burntime = 56 s

|propellant = Aluminum fuel, ammonium perchlorate oxidizer in an HTPB binder

}}

{{Infobox rocket/stage

|type = stage

|diff =

|stageno = First

|name = Thor/Delta ELT

|number =

|length = {{convert|22.4|m|abbr=on}}

|diameter = {{convert|2.44|m|abbr=on}}

|width =

|empty = {{convert|4,059|kg|abbr=on}}

|gross = {{convert|84,067|kg|abbr=on}}

|propmass =

|engines = 1 MB-3

|solid =

|thrust = {{convert|760.6|kN|abbr=on}}

|total =

|SI = {{plainlist|

• Sea level: 250 seconds
• Vacuum: 285 seconds

}}

|burntime = 222 s

|fuel = LOX / RP-1

}}

{{Infobox rocket/stage

|type = stage

|diff =

|stageno = Second

|name = Delta K

|number =

|length = {{convert|5.89|m|abbr=on}}

|diameter = {{convert|2.44|m|abbr=on}}

|width =

|empty = {{convert|950|kg|abbr=on}}

|gross = {{convert|6,954|kg|abbr=on}}

|propmass =

|engines = 1 AJ10-118K

|solid =

|thrust = {{convert|43.6|kN|abbr=on}}

|total =

|SI = 319 s

|burntime = 431 s

|fuel = {{N2O4}} /Aerozine 50

}}

{{Infobox rocket/stage

|type = stage

|diff =

|stageno = Third

|name = PAM-D (optional)

|number =

|length = {{convert|2.03|m|abbr=on}}

|diameter = {{convert|1.25|m|abbr=on}}

|width =

|empty = {{convert|128|kg|abbr=on}}

|gross = {{convert|2137|kg|abbr=on}}

|propmass =

|engines = Star 48B

|solid = yes

|thrust = {{convert|66|kN|abbr=on}}

|total =

|SI = 286 s

|burntime = 87 s

|propellant = Aluminum fuel, ammonium perchlorate oxidizer in an HTPB binder

}}

}}

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.{{Cite web |last=Krebs |first=Gunter |title=Delta-4925 |url=https://space.skyrocket.de/doc_lau_det/delta-4925.htm |access-date=2025-06-18 |website=Gunter's Space Page |language=en}} 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.