Delta Cryogenic Second Stage
 A 4-metre DCSS from a Delta IV Medium. |
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| Manufacturer | Boeing IDS United Launch Alliance |
|---|---|
| Country of origin | United States |
| Used on | Delta III Delta IV Block I SLS |
| Launch history | |
| Status | Active |
| Total launches | 21 |
| Successes (stage only) |
18 11 Delta IV 4m 7 Delta IV 5m |
| Failed | 2 (Delta III) |
| Lower stage failed |
1 (Delta III) |
| Delta III second stage | |
| Length | 8.8 metres (29 ft) |
| Diameter | 4 metres (13 ft) |
| Empty mass | 2,480 kilograms (5,500 lb) |
| Gross mass | 19,300 kilograms (43,000 lb) |
| Engines | 1 RL-10B-2 |
| Thrust | 110.1 kilonewtons (24,800 lbf) |
| Specific impulse | 462 seconds |
| Burn time | 700 seconds |
| Fuel | LH2/LOX |
| Delta IV 4-metre stage | |
| Length | 12.2 metres (40 ft) |
| Diameter | 4 metres (13 ft) |
| Empty mass | 2,850 kilograms (6,300 lb) |
| Gross mass | 24,170 kilograms (53,300 lb) |
| Engines | 1 RL-10B-2 |
| Thrust | 110.1 kilonewtons (24,800 lbf) |
| Specific impulse | 462 seconds |
| Burn time | 850 seconds |
| Fuel | LH2/LOX |
| Delta IV 5-metre stage | |
| Length | 13.7 metres (45 ft) |
| Diameter | 5 metres (16 ft) |
| Empty mass | 3,490 kilograms (7,700 lb) |
| Gross mass | 30,710 kilograms (67,700 lb) |
| Engines | 1 RL-10B-2 |
| Thrust | 110.1 kilonewtons (24,800 lbf) |
| Specific impulse | 462 seconds |
| Burn time | 1125 seconds |
| Fuel | LH2/LOX |
The Delta Cryogenic Second Stage (DCSS) is a cryogenic rocket stage used on the Delta III & Delta IV rockets, and which is planned to be used on the Block I Space Launch System. The stage, which is used as the second stage on all current Delta launch vehicles, is powered by a single Pratt & Whitney RL-10B2 engine,[1] which features an extendable carbon-carbon nozzle to improve specific impulse.[not verified in body] On the Delta IV, depending on variant, two different composite interstages are used to mate the first and second stages.[2] As of 2007[update], a tapering interstage which narrows down from 5-meters to 4-meters in diameter is used on 4-meter variants, where a cylindrical interstage is used on 5-meter variants.[2]
[edit] History
Improvements made[when?] from the Delta III stage to the Delta IV stage include the use of friction stir welding and increased propellant tank dimensions.[citation needed]
On the Space Launch System, planned for development in the mid-2010s, the stage will be referred to as the Interim Cryogenic Propulsion Stage (iCPS).[3]
[edit] References
- ^ Robert A. Braeunig (2 November 2009). "Space Launchers - Delta". Rocket and Space Technology (braeunig.us). Retrieved 26 January 2012.
- ^ a b "Delta IV Payload Planners Guide". United Launch Alliance. September 2007. p. 1-5 to 1-6.
- ^ Chris Bergin (4 October 2011). "SLS trades lean towards opening with four RS-25s on the core stage". NASASpaceflight.com. Retrieved 26 January 2012.
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