Encyclopedia Astronautica
Delta IV Medium+ (5.4)


American orbital launch vehicle. As Delta 4 medium but with 4 x GEM-60 solid rocket boosters and a 5 m diameter payload fairing.

LEO Payload: 13,600 kg (29,900 lb) to a 185 km orbit at 28.50 degrees. Payload: 6,120 kg (13,490 lb) to a GTO, 27 deg. Launch Price $: 160.000 million in 2004 dollars.

Stage Data - Delta IV Medium+ (5.4)

  • Stage 0. 4 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.

Status: In production.
Gross mass: 404,600 kg (891,900 lb).
Payload: 13,600 kg (29,900 lb).
Height: 77.20 m (253.20 ft).
Diameter: 5.00 m (16.40 ft).
Thrust: 5,860.00 kN (1,317,380 lbf).
Apogee: 185 km (114 mi).
First Launch: 2009.12.06.
Number: 1 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • HS 702 American communications satellite bus. Operational, first launched 1999.12.22. More...

Associated Engines
  • 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...
  • 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...
  • 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 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...
  • 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+ (5.4) Chronology


2009 December 6 - . 01:47 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC37B. Launch Pad: SLC37B. LV Family: Delta IV. Launch Vehicle: Delta IV Medium+ (5.4).
  • USA 211 - . Payload: WGS 3. Mass: 5,990 kg (13,200 lb). Nation: USA. Agency: Martin. Class: Communications. Type: Military communications satellite. Spacecraft: HS 702. USAF Sat Cat: 36108 . COSPAR: 2009-068A. Apogee: 64,827 km (40,281 mi). Perigee: 31,268 km (19,428 mi). Inclination: 0.6000 deg. Period: 2,106.00 min. Summary: US Army Wideband Global Satcom, carried X-band and Ka-band communications payloads..

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