Delta III
space launch vehicle | |
Has use | Orbital launch vehicle |
---|---|
Manufacturer | Boeing (design, manufacturing and assembly) Mitsubishi Heavy Industries (extended kerosene tank and H-II-based upper stage manufacturing) |
Country of origin | United States |
Size | |
Height | 35 m (115 ft) |
Diameter | 4 m (13 ft) |
Mass | 301,450 kg (664,580 lb) |
Stages | 2 |
Capacity | |
Payload to LEO | |
Mass | 8,290 kg (18,280 lb)[1] |
Payload to GTO | |
Mass | 3,810 kg (8,400 lb)[1] |
Associated rockets | |
Family | Delta |
Launch history | |
Status | Retired |
Launch sites | SLC-17, Cape Canaveral |
Total launches | 3 |
Success(es) | 0 |
Failure(s) | 2 |
Partial failure(s) | 1 |
First flight | August 26, 1998 |
Last flight | August 23, 2000 |
Boosters | |
No. boosters | 9 GEM 46 |
Maximum thrust | 628.3 kN (141,200 lbf) |
Specific impulse | 273 seconds (2.68 km/s) |
Burn time | 75 seconds |
Propellant | HTPB mix, similar to PBAN |
First stage | |
Powered by | 1 Rocketdyne RS-27A |
Maximum thrust | 1,085.79 kN (244,100 lbf) |
Specific impulse | 254 seconds (2.49 km/s) |
Burn time | 260 seconds[2] |
Propellant | LOX/RP-1 |
Second stage | |
Powered by | 1 Pratt & Whitney RL10B |
Maximum thrust | 110.03 kN (24,740 lbf) |
Specific impulse | 462 seconds (4.53 km/s)[3] |
Burn time | 700 seconds[2] |
Propellant | LOX/LH2 |
Third stage (Optional) | |
Powered by | 1 Thiokol Star 48B |
Maximum thrust | 66.723 kN (15,000 lbf) |
Specific impulse | 286 seconds (2.80 km/s) |
Burn time | 87 seconds |
Propellant | HTPB |
Delta III was an expendable launch vehicle made by Boeing. The first Delta III launch was on August 26, 1998.[4] Of its three flights, the first two were failures, and the third, though declared successful, reached the low end of its targeted orbit range and carried only a dummy (inert) payload. The Delta III could deliver up to 8,400 pounds (3,800 kilograms) to geostationary transfer orbit, twice the payload of its predecessor, the Delta II.[1] Under the four-digit designation system from earlier Delta rockets, the Delta III is classified as the Delta 8930.
Description[]
Like the Delta II, the first stage of the Delta III burned kerosene and liquid oxygen and was powered by one Rocketdyne RS-27A main engine with two vernier engines for roll control.[5] While the propellant load and gross mass of the stage were nearly identical to the Delta II, the diameter of the kerosene tank was increased from 2.4 meters to 4 meters. This reduced the overall length of the vehicle and allowed the Delta III to use the same launch facilities as the Delta II with only minor modifications.[1] First stage thrust was augmented by nine GEM-46 solid rocket boosters, sometimes referred to as GEM LDXL (Large Diameter Extended Length). These were 14.7 meters in length, 1.2 m (46 inches) in diameter, and had a mass of 19 metric tons each, about six metric tons more than the Delta II's standard GEM-40 motors. Six were ignited on the launch pad, while the remaining three were ignited just before burnout and separation of the ground-lit boosters. To maintain steering authority, three of the boosters had vectoring nozzles.[1] GEM-46 boosters would later find use on the Delta II, leading to the Delta II Heavy.
The second stage of the Delta III was the newly developed Delta Cryogenic Second Stage (DCSS), which burned liquid hydrogen and liquid oxygen. The liquid hydrogen tank was 4 meters in diameter, while the separate liquid oxygen tank was 2.4 meters in diameter. This stage offered significantly better performance than the Delta II's second stage, the Delta-K, which burns hypergolic propellants.[1] The DCSS was powered by a Pratt & Whitney RL10B-2 engine, derived from the RL10 powering the Centaur upper stage but featuring electromechanical actuators for gimbal control and an extending nozzle for increased specific impulse.[5] After Delta III's retirement, this stage was modified for use as the Delta IV's second stage.[6] The payload fairing was a new composite design, matching the upper stage hydrogen tank at 4 meters diameter and allowing larger payloads than the Delta II's 9.5 or 10 foot fairing. Payload to GTO (Geostationary-Transfer Orbit) was doubled versus the Delta II. However, the consecutive failures of the initial Delta IIIs, combined with the more advanced Delta IV program and the continuing success of the Delta II, left the Delta III as an interim vehicle.[3]
Launches[]
Flight Number | Date / time (UTC) | Rocket Configuration |
Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
1 | August 27, 1998 01:17 |
Delta 3 8930 | CCAFS SLC-17B | Galaxy 10 | 1,543 pounds (700 kilograms) | GTO | PanAmSat / Intelsat | Failure |
Maiden flight of Delta 3 8930, Destroyed by range safety after control problems and depletion of hydraulic fluid, Communications satellite. | ||||||||
2 | May 5, 1999 01:00 |
Delta 3 8930 | CCAFS SLC-17B | Orion 3 | 9,480 pounds (4,300 kilograms) | GTO | Loral | Failure |
Second stage engine failure. Payload placed into LEO, Communications satellite. | ||||||||
3 | August 23, 2000 11:05 |
Delta 3 8930 | CCAFS SLC-17B | DM-F3 | 9,663 pounds (4,383 kilograms) | GTO | US Air Force | Partial failure[7] |
Reached lower than planned orbit, final flight of Delta 3 8930, Demosat. |
See also[]
- Delta (rocket family)
- Comparison of orbital launchers families
References[]
- ^ a b c d e f "Delta III Launch Vehicle". 2001. Archived from the original on November 14, 2001.
- ^ a b "Delta III Payload Planner's Guide" (PDF). Archived from the original (PDF) on 19 November 2001.
- ^ a b "Delta III Data Sheet". Space Launch Report. Retrieved 26 July 2014.
- ^ "Delta III Takes a Dip". WIRED. Retrieved 2018-10-24.
- ^ a b "Delta 3". Astronautix. Archived from the original on November 12, 2013. Retrieved January 5, 2015.
- ^ "Delta 3 Rocket Falls Short, but Still a Success Boeing Says". SpaceFlightNow. August 24, 2000.
- ^ "Delta 3 rocket falls short but still a success, Boeing says". Spaceflight Now. August 24, 2000.
External links[]
- Boeing spacecraft and space launch systems
- Delta (rocket family)