Encyclopedia Astronautica
Delta IV Medium+ (4.2)



delt4m42.jpg
Delta 4 Med (4.2)
Delta IV Medium+ (4.2)
Credit: © Mark Wade
American orbital launch vehicle. As Delta 4 medium but with 2 x GEM-60 solid rocket boosters and a 4 m diameter payload fairing.

LEO Payload: 11,700 kg (25,700 lb) to a 185 km orbit at 28.50 degrees. Payload: 5,300 kg (11,600 lb) to a GTO, 27 deg. Launch Price $: 138.000 million in 2004 dollars.

Stage Data - Delta IV Medium+ (4.2)

  • Stage 0. 2 x GEM 60. Gross Mass: 33,798 kg (74,511 lb). Empty Mass: 3,849 kg (8,485 lb). Thrust (vac): 826.553 kN (185,817 lbf). Isp: 275 sec. Burn time: 90 sec. Isp(sl): 243 sec. Diameter: 1.52 m (4.98 ft). Span: 1.52 m (4.98 ft). Length: 53.00 m (173.00 ft). Propellants: Solid. No Engines: 1. Engine: GEM 60. Status: In production. Comments: 90.5 bar chamber pressure, 11.0 nozzle expansion ratio. Figures for TVC version. Fixed nozzle version is 599 kg lighter.
  • Stage 1. 1 x Delta RS-68. Gross Mass: 226,400 kg (499,100 lb). Empty Mass: 26,760 kg (58,990 lb). Thrust (vac): 3,312.755 kN (744,737 lbf). Isp: 420 sec. Burn time: 249 sec. Isp(sl): 365 sec. Diameter: 5.10 m (16.70 ft). Span: 5.10 m (16.70 ft). Length: 40.80 m (133.80 ft). Propellants: Lox/LH2. No Engines: 1. Engine: RS-68. Status: In production. Comments: Low cost expendable stage using lower performance engine. Used in Delta 4, Boeing EELV. Engine can be throttled to 60%.
  • Stage 2. 1 x Delta 4 - 2. Gross Mass: 24,170 kg (53,280 lb). Empty Mass: 2,850 kg (6,280 lb). Thrust (vac): 110.050 kN (24,740 lbf). Isp: 462 sec. Burn time: 850 sec. Diameter: 2.44 m (8.00 ft). Span: 4.00 m (13.10 ft). Length: 12.00 m (39.00 ft). Propellants: Lox/LH2. No Engines: 1. Engine: RL-10B-2. Status: In production. Comments: Delta 3 second stage with hydrogen tank stretch.

AKA: Delta 4M+(4,2).
Status: Active.
Gross mass: 292,732 kg (645,363 lb).
Payload: 11,700 kg (25,700 lb).
Height: 66.20 m (217.10 ft).
Diameter: 5.00 m (16.40 ft).
Thrust: 4,183.20 kN (940,421 lbf).
Apogee: 185 km (114 mi).
First Launch: 2002.11.20.
Last Launch: 2011.07.16.
Number: 8 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • HS 601 American communications satellite bus. First launch 1990.01.09. 3-axis unified ARC 22 N and one Marquardt 490 N bipropellant thrusters, Sun and Barnes Earth sensors and two 61 Nms 2-axis gimbaled momentum bias wheels. More...
  • Jumpseat-2 American military naval signals reconnaisance satellite. 2 launches, 2006.06.25 (USA 200) to 2008.03.13 (USA 200). More...

Associated Engines
  • GEM 46 Hercules solid rocket engine. 608.1 kN. Air-ignited versions have nozzle ratio of 24.8:1, specific impulse of 284 sec. Isp=274s. First flight 1998. More...
  • GEM 60 Hercules solid rocket engine. 851.5 kN. In production. Isp=275s. Used as strap-on boosters for Delta 3 , Delta IV Medium. First flight 2002. More...
  • RL-10B-2 Pratt and Whitney lox/lh2 rocket engine. 110 kN. In production. Isp=462s. Used on Delta 3 , Delta IV launch vehicles. First flight 1998. Extendable exit cone for increased specific impulse; electromechanical actuators replace hydraulic systems. More...
  • RS-68 Rocketdyne lox/lh2 rocket engine. 3312 kN. In production. Isp=420s. First new large liquid-fueled rocket engine developed in America in more than 25 years. Powered the Delta IV booster. First flight 2002. More...

See also
  • Delta IV The Delta IV was the world's first all-Lox/LH2 launch vehicle and represented the only all-new-technology launch vehicle developed in the United States since the 1970's. It was the winner of the bulk of the USAF EELV orders and was based on the all-new RS-68-powered Lox/LH2 cryogenic Common Booster Core (CBC). This could be used with new Delta cryogenic upper stages powered by the RL10 engine but unrelated to previous Centaur upper stages. More...

Associated Manufacturers and Agencies
  • Douglas American manufacturer of rockets, spacecraft, and rocket engines. Boeing Huntington Beach, Huntington Beach, CA, USA. More...

Associated Programs
  • Eutelsat EUTELSAT regional geostationary telecommunication satellite for European countries. Operated by the EUTELSAT organization. More...

Associated Launch Sites
  • Cape Canaveral America's largest launch center, used for all manned launches. Today only six of the 40 launch complexes built here remain in use. Located at or near Cape Canaveral are the Kennedy Space Center on Merritt Island, used by NASA for Saturn V and Space Shuttle launches; Patrick AFB on Cape Canaveral itself, operated the US Department of Defense and handling most other launches; the commercial Spaceport Florida; the air-launched launch vehicle and missile Drop Zone off Mayport, Florida, located at 29.00 N 79.00 W, and an offshore submarine-launched ballistic missile launch area. All of these take advantage of the extensive down-range tracking facilities that once extended from the Cape, through the Caribbean, South Atlantic, and to South Africa and the Indian Ocean. More...
  • Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...
  • Cape Canaveral LC37B Saturn I, Delta IV launch complex. Complexes 34 and 37 were designed to support NASA's Saturn I and Saturn IB program. Complex 37 was built in 1962, and it was occupied by NASA in January 1963. Complex 37 supported eight Saturn I and Saturn IB missions, including the first flight of an unmanned Apollo lunar module, between 29 January 1964 and 23 January 1968. Complexes 34 and 37 were mothballed in November 1971, and their service structures were scrapped in April 1972. NASA retained control of both complexes, and both sites became NASA tour stops. More...

Associated Stages
  • Delta 4 - 2 Lox/LH2 propellant rocket stage. Loaded/empty mass 24,170/2,850 kg. Thrust 110.05 kN. Vacuum specific impulse 462 seconds. Delta 3 second stage with hydrogen tank stretch. More...
  • Delta RS-68 Lox/LH2 propellant rocket stage. Loaded/empty mass 226,400/26,760 kg. Thrust 3,312.76 kN. Vacuum specific impulse 420 seconds. Low cost expendable stage using lower performance engine. Used in Delta 4, Boeing EELV. Engine can be throttled to 60%. More...
  • GEM 60 Solid propellant rocket stage. Loaded/empty mass 33,798/3,849 kg. Thrust 826.55 kN. Vacuum specific impulse 275 seconds. 90.5 bar chamber pressure, 11.0 nozzle expansion ratio. Figures for TVC version. Fixed nozzle version is 599 kg lighter. More...

Delta IV Medium+ (4.2) Chronology


2002 November 20 - . 22:39 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2). LV Configuration: Delta 4M+(4,2) D4-1 (293) 4240.
  • Eutelsat W5 - . Payload: W1A. Mass: 3,170 kg (6,980 lb). Nation: Europe. Agency: Eutelsat. Manufacturer: Cannes. Program: Eutelsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: Spacebus 3000. USAF Sat Cat: 27554 . COSPAR: 2002-051A. Apogee: 35,801 km (22,245 mi). Perigee: 35,788 km (22,237 mi). Inclination: 0.1000 deg. Period: 1,436.50 min. Maiden flight of the Delta 4 EELV booster, delayed due to development problems from January and November 2001, April 30, July 15, August 31, October 9, November 3, 16 and 19. EUTELSAT W5 was a European (EUTELSAT Consortium) geostationary communication spacecraft. EUTELSAT W5 was to provide voice, video, and Internet services to all countries in western Europe, central Asia, and the Indian subcontinent through its 24 Ku-band transponders after being parked over 70.5 E longitude. As of 2007 Mar 10 located at 70.55E drifting at 0.004W degrees per day.

2006 May 24 - . 22:11 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2). LV Configuration: Delta 4M+(4,2) D4-5 (315) 4240.
  • GOES-13 - . Mass: 3,199 kg (7,052 lb). Nation: USA. Agency: NOAA. Manufacturer: Boeing. Program: GOES. Class: Earth. Type: Weather satellite. Spacecraft: HS 601. USAF Sat Cat: 29155 . COSPAR: 2006-018A. Apogee: 35,791 km (22,239 mi). Perigee: 35,779 km (22,231 mi). Inclination: 0.5000 deg. Period: 1,436.00 min. GOES-13 carried weather imager and sounder instruments, a space environment monitor, and a soft X-ray solar imaging telescope. Mass was 1543 kg empty. It joined GOES 10 (operating as GOES-WEST), GOES 12 (operating as GOES-EAST) and GOES 11 (on standby, set to replace GOES-10 on June 27). As of 2007 Mar 11 located at 105.26W drifting at 0.008W degrees per day.

2006 June 25 - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC6. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2). LV Configuration: Delta 4M+(4,2) D4-6 (317) 4240.
  • USA 184 - . Payload: NRO L-22. Mass: 4,500 kg (9,900 lb). Nation: USA. Agency: NRO. Class: Military. Type: Electronic intelligence satellite. Spacecraft: Jumpseat-2. USAF Sat Cat: 29249 . COSPAR: 2006-027A. Secret payload for the National Reconnaissance Office. The intended orbit was thought to be a "Molniya" elliptical 12-hour orbit with an inclination of 63 degrees. American data relay and signals intelligence satellites have used this orbit in the past, notably the Jumpseat series of 1971-1983. A secondary payload was later confirmed to be the first SBIRS-HEO (Space-based Infrared System) sensor. SBIRS was the successor to the DSP (Defence Support Program), which provided early warning of missile launches. Also carried the NASA/Los Alamos TWINS-A magnetospheric research payload

2009 June 27 - . 22:51 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2). LV Configuration: Delta IV Medium+ (4.2) s/n D342.
  • GOES 14 - . Payload: GOES O. Mass: 3,210 kg (7,070 lb). Nation: USA. Agency: Martin. Program: GOES. Spacecraft: HS 601. USAF Sat Cat: 35491 . COSPAR: 2009-033A. Apogee: 35,788 km (22,237 mi). Perigee: 35,786 km (22,236 mi). Inclination: 0.5000 deg. Period: 1,436.10 min. Summary: Geostationary Operational Environmental Satellite..

2010 March 4 - . 23:57 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2). LV Configuration: Delta IV Medium+ (4.2) s/n D348.
  • GOES 15 - . Mass: 3,240 kg (7,140 lb). Nation: USA. Agency: Martin. Program: GOES. Class: Earth. Type: Weather satellite. Spacecraft: HS 601. USAF Sat Cat: 36411 . COSPAR: 2010-008A. Apogee: 35,803 km (22,246 mi). Perigee: 35,770 km (22,220 mi). Inclination: 0.3000 deg. Period: 1,436.10 min.

2010 May 28 - . 03:00 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2).
  • USA 213 - . Payload: Navstar 65 / GPS SVN 62 IIF SV-1. Nation: USA. Agency: Martin. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2F. USAF Sat Cat: 36585 . COSPAR: 2010-022A. Apogee: 20,225 km (12,567 mi). Perigee: 20,188 km (12,544 mi). Inclination: 55.0000 deg. Period: 719.00 min. Summary: First Block IIF Global Positioning System satellite. Supported the L1M and L2M military GPS channels, the L2C civilian channel and a new L5 civilian channel. Also included a nuclear explosion detection system..

2011 March 11 - . 23:38 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2).
  • USA 227 - . Payload: NROL-27. Nation: USA. Class: Communications. Type: Military communications satellite. Spacecraft: SDS-3. USAF Sat Cat: 37377 . COSPAR: 2011-011A. Summary: Probable classified Satellite Data System communications satellite inserted into geostationary orbit..

2011 July 16 - . 06:41 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (4.2).
  • USA 232 - . Payload: Navstar 66 / SVN 63 / GPSIIF-2. Nation: USA. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2F. USAF Sat Cat: 37753 . COSPAR: 2011-036A. Apogee: 20,188 km (12,544 mi). Perigee: 20,177 km (12,537 mi). Inclination: 55.0000 deg. Period: 718.00 min.

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