Delta Cryogenic Second Stage

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Delta Cryogenic Second Stage
Second stage of a Delta IV Medium rocket.jpg
A 4-meter DCSS from a Delta IV Medium.
Manufacturer Boeing IDS
United Launch Alliance
Country of origin United States
Used on Delta III
Delta IV
SLS Block I
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 meters (29 ft)
Diameter 4 meters (13 ft)
Empty mass 2,480 kilograms (5,470 lb)
Gross mass 19,300 kilograms (42,500 lb)
Engines 1 RL10B-2
Thrust 110.1 kilonewtons (24,800 lbf)
Specific impulse 462 seconds
Burn time 700 seconds
Fuel LH2/LOX
Delta IV 4-meter stage
Length 12.2 meters (40 ft)
Diameter 4 meters (13 ft)
Empty mass 2,850 kilograms (6,280 lb)
Gross mass 24,170 kilograms (53,290 lb)
Engines 1 RL10B-2
Thrust 110.1 kilonewtons (24,800 lbf)
Specific impulse 462 seconds
Burn time 850 seconds
Fuel LH2/LOX
Delta IV 5-meter stage
Length 13.7 meters (45 ft)
Diameter 5 meters (16 ft)
Empty mass 3,490 kilograms (7,690 lb)
Gross mass 30,710 kilograms (67,700 lb)
Engines 1 RL10B-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 family of cryogenic rocket stages used on the Delta III & Delta IV rockets, and which is planned to be used on the Block I Space Launch System. The stage is powered by a single Pratt & Whitney RL10B-2 engine,[1] which features an extendable carbon-carbon nozzle to improve specific impulse.[2]

Delta III[edit]

The first DCSS variant flown was on the Delta III, performing on 2 out of 3 flights. An un-flown example is on display outside the Discovery Cube Orange County.

Delta IV[edit]

On the Delta IV, depending on variant, two different versions are flown. Composite interstages used to mate the first and second stages together accommodate the different configurations.[2] For the Delta IV-M, a tapering interstage narrows down in diameter from 5-meters to 4-meters is used on the 4-meter DCSS, while a cylindrical interstage is used on the 5-meter DCSS.[2]

ICPS[edit]

A modified DCSS will be used as a second stage on the debut flight of NASA's Space Launch System,[3] Exploration Mission 1 (EM-1), scheduled for December 2017.[4]

References[edit]

  1. ^ Robert A. Braeunig (2 November 2009). "Space Launchers - Delta". Rocket and Space Technology (braeunig.us). Retrieved 26 January 2012. 
  2. ^ a b c "Delta IV Payload Planners Guide" (PDF). United Launch Alliance. September 2007. p. 1-5 to 1-6. Archived from the original (PDF) on 22 July 2011. 
  3. ^ Chris Bergin (4 October 2011). "SLS trades lean towards opening with four RS-25s on the core stage". NASASpaceflight.com. Retrieved 26 January 2012. 
  4. ^ "Evolving plans: No human rating for ICPS for SLS EM-1 mission". NASASpaceflight.com. April 28, 2014. Retrieved July 2014.