Titan IIIM

{{Short description|Planned American expendable launch vehicle}}

{{Infobox rocket

|name = Titan IIIM

|image = Dorian 10.jpg

|caption = Titan IIIM proposal

|function = Expendable launch system

|manufacturer = Martin Marietta

|country-origin = United States

|cpl = {{US$|22 million}} {{small|(1965)}}

|height = {{convert|39.0|m|ft|abbr=on}}

|diameter = {{convert|3.05|m|ft|abbr=on}}

|mass = {{convert|836560|kg|lb|abbr=on}}

|stages = 2

|family = Titan

|status = Cancelled

|sites = CCAFS LC-40
Vandenberg AFB SLC-6

|launches = 0

|capacities =

{{Infobox rocket/payload

|location = {{convert|185|km|mi|abbr=on}}

|kilos = {{convert|17000|kg|lb|abbr=on}}

}}

|stagedata =

{{Infobox rocket/stage

|type = booster

|name = UA1207

|number = 2

|length = {{convert|34.14|m|ft|abbr=on}}

|diameter = {{convert|3.05|m|ft|abbr=on}}

|empty = {{convert|51230|kg|lb|abbr=on}}

|gross = {{convert|319330|kg|lb|abbr=on}}

|engines = off

|solid = yes

|thrust = {{nowrap| {{convert|7116.999|kN|abbr=on}} }}

|SI = {{convert|272|isp|abbr=on}}

|burntime = 120 s

|fuel = Solid

}}

{{Infobox rocket/stage

|type = stage

|stageno = First

|name = Titan IIIB-1

|length = {{convert|23.99|m|ft|abbr=on}}

|diameter = {{convert|3.05|m|ft|abbr=on}}

|empty = {{convert|7000|kg|lb|-2|abbr=on}}

|gross = {{convert|139935|kg|lb|abbr=on}}

|engines = 2 × LR87-11

|thrust = {{convert|2413.191|kN|abbr=on}}

|SI = {{convert|302|isp|abbr=on}}

|burntime = 161 s

|fuel = A-50 / {{N2O4}}

}}

{{Infobox rocket/stage

|type = stage

|stageno = Second

|name = Titan IIIB-2

|length = {{convert|8.6|m|ft|1|abbr=on}}

|diameter = {{convert|3.05|m|ft|abbr=on}}

|empty = {{convert|2900|kg|lb|-2|abbr=on}}

|gross = {{convert|37560|kg|lb|abbr=on}}

|engines = 1 × LR91-11

|thrust = {{convert|460.314|kN|abbr=on}}

|SI = {{convert|316|isp|abbr=on}}

|burntime = 230 s

|fuel = A-50 / {{N2O4}}

}}

}}

The Titan IIIM was a planned American expendable launch system, intended to launch the Manned Orbiting Laboratory and other payloads. Development was cancelled in 1969. The stretched core stage was used on some versions of the Titan IIIB and the projected UA1207 solid booster rockets were eventually used on the Titan IV.{{cite web |url=http://www.astronautix.com/t/titan3m.html |archive-url=https://web.archive.org/web/20160820052106/http://www.astronautix.com/t/titan3m.html |url-status=dead |archive-date=August 20, 2016 |title=Titan 3M |work=Astronautix.com |access-date=25 June 2016}}{{cite book |chapter-url=https://books.google.com/books?id=c8PpO58QwowC&pg=PA376 |chapter=Military Gemini |title=Gemini: Steps to the Moon |publisher=Springer-Praxis |first=David J. |last=Shayler |date=2002 |isbn=1-85233-405-3}}