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Delta 4M
Part of Delta IV Family
Delta IV Medium
Delta IV Medium
Credit: © Mark Wade
American orbital launch vehicle. Basic Delta-4 vehicle with no strap-ons, the core vehicle, and RL10B-1 upper stage with a 4 m diameter payload fairing. World's first all-cryogenic launch vehicle.

AKA: Delta IV Medium. Status: Active. First Launch: 2003-03-11. Last Launch: 2006-11-04. Number: 3 . Payload: 8,600 kg (18,900 lb). Thrust: 2,890.00 kN (649,690 lbf). Gross mass: 249,500 kg (550,000 lb). Height: 63.00 m (206.00 ft). Diameter: 5.00 m (16.40 ft). Apogee: 185 km (114 mi).

LEO Payload: 8,600 kg (18,900 lb) to a 185 km orbit at 28.50 degrees. Payload: 3,900 kg (8,500 lb) to a GTO, 27 deg. Launch Price $: 133.000 million in 2004 dollars.

Stage Data - Delta IV Medium

  • 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.


More at: Delta 4M.

Family: orbital launch vehicle. Country: USA. Engines: RL-10B-2, RS-68. Spacecraft: DSCS III, DMSP Block 5D-3. Projects: DMSP, DSCS. Launch Sites: Cape Canaveral, Vandenberg, Cape Canaveral LC37B, Vandenberg SLC6. Stages: Delta 4-2, Delta RS-68. Agency: Douglas.

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