三角洲4號重型運載火箭

三角洲4號重型運載火箭 (Delta 9250H)為一次性（英语：Evolved Expendable Launch Vehicle）大型運載火箭，為三角洲4號系列運載火箭中最大者。本火箭由聯合發射聯盟生產，於2004年進行首次發射，2024年退役。 三角洲4號重型運載火箭使用兩枚公共助推核心(CBCs)液体火箭助推器代替其他三角洲4號運載火箭所使用的GEM-60（英语：Graphite-Epoxy Motor）固體燃料火箭。三枚公共助推核心於發射時為全推力運作，經過44秒後，中央的公共助推核心降低推力至55%，以節省燃料至助推器分離時。助推器推進至發射後242秒並分離，而中央公共助推核心則恢復全推力，並於助推器分離後86秒後，由第二節接續將衛星送入軌道。 ^A 自卡纳维拉尔角空军基地SLC-37B發射台發射 ^B 自范登堡空軍基地[[SLC-6]發射台發射] ^C 公共助推核心運作瑕疵，較預期軌道低 长征五号系列火箭 (使用中) 質子M型運載火箭 (使用中) 安加拉系列運載火箭 (使用中) 獵鷹重型運載火箭 (使用中) New Glenn（英语：New Glenn） (研製中) 亞利安5號運載火箭 (已退役) 土星1B號運載火箭 (已退役) 泰坦系列運載火箭 (已退役) 泰坦4號運載火箭 (已退役) ULA CEO Tory Bruno. Twitter. [12 February 2018]. （原始内容存档于2019-02-19）. Delta IV Heavy goes for about $350M. That’s current and future, after the retirement of both Delta IV Medium and Delta II.  Delta IV Heavy. Spaceflight 101. [July 26, 2014]. （原始内容存档于2014-12-13）.  Delta IV Payload Planner's Guide, June 2013 (PDF). United Launch Alliance. [July 26, 2014]. （原始内容 (PDF)存档于2014-07-10）.  Mission Status Center. SpaceflightNow. [July 26, 2014]. （原始内容存档于2018-10-07）. The ULA Delta 4-Heavy is currently the world’s largest rocket, providing the nation with reliable, proven, heavy lift capability for our country's national security payloads from both the east and west coasts.  Falcon Heavy, SpaceX’s Big New Rocket, Succeeds in Its First Test Launch. NYTimes. [Feb 6, 2018]. （原始内容存档于2018-02-16）. The Falcon Heavy is capable of lifting 140,000 pounds to low-Earth orbit, more than any other rocket today.  "Boeing Delta IV Heavy Achieves Major Test Objectives in First Flight" （页面存档备份，存于互联网档案馆）, Boeing, 2004, accessed March 22, 2012. Krebs, Gunter. Delta-4. Gunter's Space Page. [15 March 2018]. （原始内容存档于2014-10-17）.  Pietrobon, Steven. United States Military Manifest. 5 November 2018 [5 November 2018]. （原始内容存档于2019-05-20）.  Graham, William. ULA Delta IV-Heavy launch with NROL-71 realigns for Saturday. December 7, 2018 [December 7, 2018]. （原始内容存档于2018-12-09）.  Launch Schedule. Spaceflight Now. 27 October 2020 [31 October 2020]. （原始内容存档于2018-08-16）.  Launch Mission Execution Forecast. 45th Weather Squadron - Patrick Air Force Base. 30 October 2020 [31 October 2020]. （原始内容存档于2021-12-21）.  本文含有此來源中屬於公有领域的内容。 Harbaugh, Jennifer. The Great Escape: SLS Provides Power for Missions to the Moon. NASA. 2018-07-09 [2018-09-04]. （原始内容存档于2019-12-11）.  Vought, Russell T. Letter to the Chair and Vice Chair of the Senate Appropriations Committee with respect to 10 of the FY 2020 annual appropriations bills (PDF). whitehouse.gov: 7. [13 November 2019]. （原始内容存档 (PDF)于13 November 2019）. estimated cost of over US$2 billion per launch for the SLS once development is complete  Falcon Heavy. SpaceX. [2023-05-02]. （原始内容存档于2023-04-30）.  长征五号（CZ-5）. CNSA.  Mu, Xuequan. China's largest carrier rocket Long March-5 makes new flight. Xinhuanet.  khrunichev.ru.. Khrunichev State Research and Production Space Center.  Angara-5 to replace Proton.  Ralph, Eric. Russia quietly shelves development of sole SpaceX Falcon 9-competitive rocket.  Proton Launch System Mission Planner's Guide (PDF). International Launch Services. July 2009: Section 2. LV Performance.  United States Government Accountability Office. Surplus Missile Motors (PDF). August 2017.