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- Q249492 subject Q8372196.
- Q249492 abstract "The Delta IV Heavy (Delta 9250H) is an expendable heavy lift launch vehicle, the largest type of the Delta IV family, and the world's highest capacity rocket currently in operation. It was first launched in 2004.The Delta IV Heavy uses two additional Common Booster Cores as liquid rocket boosters instead of the GEM-60 solid rocket motors used by the Delta IV Medium+ versions. At lift off, all three cores operate at full thrust, and 44 seconds later the center core throttles down to 55% to conserve fuel until booster separation. The boosters burn out at 242 seconds after launch, and are separated as the core booster throttles back up to full thrust. The core burns out 86 seconds later, and the second stage completes the ascent to orbit.The first launch of the Delta IV Heavy in 2004 carried a boilerplate payload, and was a partial failure. Cavitation in the liquid oxygen propellant lines caused shutdown of both boosters 8 seconds early, and the core engine 9 seconds early; this resulted in a lower staging velocity for which the second stage was unable to compensate. The payload was left in a lower than intended orbit. Its first operational payload was the DSP-23 satellite, successfully launched in 2007; it was then used to launch a further five visual and electronic reconnaissance satellites for the National Reconnaissance Office through 2013.In December 2014, the Delta IV Heavy was used to launch an uncrewed test flight of the Orion Multi-Purpose Crew Vehicle, designated EFT-1. After several delays on December 4, the mission was successfully launched at 12:05 UTC on December 5.Capacity of the Delta IV Heavy:Low Earth orbit (LEO), 200 km × 28.7°: 28,790 kg (63,470 lb)Low Earth orbit (ISS), 407 km × 51.6°: 25,980 kg (57,280 lb)Geosynchronous transfer orbit (GTO): 14,220 kg (31,350 lb)Geosynchronous orbit (GEO): 6,750 kg (14,880 lb)Lunar transfer orbit (LTO) 10,000 kg (22,000 lb) / Mars transfer orbit 8,000 kg (17,600 lb)The Delta IV Heavy's total mass at launch is approximately 733,000 kg (1,616,000 lb). For comparison the total mass at launch of the Saturn V use on the Apollo program, heaviest payload launched on record, was 2,970,000 kg (6,550,000 lb).".
- Q249492 countryOrigin Q30.
- Q249492 diameter "5.0".
- Q249492 height "72.0".
- Q249492 launchSite Q2175575.
- Q249492 launchSite Q2510125.
- Q249492 launchSite Q334465.
- Q249492 maidenFlight "2004-12-21".
- Q249492 manufacturer Q1236833.
- Q249492 mass "7.33E8".
- Q249492 partialFailedLaunches "1".
- Q249492 rocketFunction Q11222716.
- Q249492 rocketStages "2".
- Q249492 status "Active".
- Q249492 successfulLaunches "7".
- Q249492 thumbnail Delta_IV_launch_2013-08-28.jpg?width=300.
- Q249492 totalLaunches "8".
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- Q249492 countryOrigin Q30.
- Q249492 first "2004-12-21".
- Q249492 function "Orbital heavy lift launch vehicle".
- Q249492 launches "8".
- Q249492 manufacturer Q1236833.
- Q249492 name "Delta IV Heavy".
- Q249492 partial "1".
- Q249492 sites Q2175575.
- Q249492 sites Q334465.
- Q249492 sites "SLC-6 Vandenberg AFB".
- Q249492 stages "2".
- Q249492 status "Active".
- Q249492 success "7".
- Q249492 type MeanOfTransportation.
- Q249492 type Rocket.
- Q249492 type DesignedArtifact.
- Q249492 type Thing.
- Q249492 type Q41291.
- Q249492 comment "The Delta IV Heavy (Delta 9250H) is an expendable heavy lift launch vehicle, the largest type of the Delta IV family, and the world's highest capacity rocket currently in operation. It was first launched in 2004.The Delta IV Heavy uses two additional Common Booster Cores as liquid rocket boosters instead of the GEM-60 solid rocket motors used by the Delta IV Medium+ versions.".
- Q249492 label "Delta IV Heavy".
- Q249492 depiction Delta_IV_launch_2013-08-28.jpg.
- Q249492 name "Delta IV Heavy".