Aerojet Rocketdyne

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Aerojet Rocketdyne
Type Division
Industry Aerospace
Predecessors Aerojet
Pratt & Whitney Rocketdyne
Founded 2013
Headquarters Sacramento, California, United States
Products Rocket motor and missile propulsion
Parent GenCorp

Aerojet Rocketdyne is an American rocket and missile propulsion manufacturer. Headquartered in Sacramento, California, the company is owned by GenCorp. Aerojet Rocketdyne was formed in 2013 when Aerojet (already owned by GenCorp) and Pratt & Whitney Rocketdyne were merged, following the latter's acquisition by GenCorp from Pratt & Whitney.[1][2]


Current engines[edit]

  • RS-25 (LH2/LOX) reusable main engine for the retired Space Shuttle. Remaining engines are scheduled for consumption on Space Launch System first stage launches after which an expendable version, RS-25E will be developed for follow-on SLS launches.
  • RL10 (LH2/LOX) Developed by Pratt & Whitney and currently used on both the upper stage of the Delta IV as well as the Centaur upper stage for the Atlas V. Formerly used on and Titan upper stage Centaur, the Saturn I, and on the vertical-landing McDonnell Douglas DC-X "Delta Clipper". It was intended to serve as the main propulsion engine for the proposed Altair lunar lander.
  • RS-68 (LH2/LOX) First stage engine for the Delta IV.
  • J-2X (LH2/LOX) is under development as of 2013 to be used on the Earth Departure Stage for the Block II of the Space Launch System.
  • Baby Bantam (kerosene/LOX)—In June 2014, Aerojet Rocketdyne announced that they had "manufactured and successfully tested an engine which had been entirely 3D printed." The engine is a 22 kN (5,000 lbf) thrust engine.[3]
  • AJ-26 (RP-1/LOX) Rebranded and modified NK-33 engines imported from Russia. Used as first stage engine for the Antares.

Former production engines[edit]



The AR-1 is a proposed 2,200-kilonewton-class (500,000 lbf) thrust kerosene/LOX rocket engine that Aerojet Rocketdyne proposed in 2014 to "lobby the government to fund an all-new, U.S.-sourced rocket propulsion system." As of June 2014 Aerojet's early projection was that the cost would be under US$25 million per pair of engines, not including the up to US$1 billion estimated development cost to be funded by the government.[4][5]

See also[edit]


  1. ^ "Two engine rivals merge into Aerojet Rocketdyne". Spaceflight Now. 18 June 2013. Retrieved 22 June 2013. 
  2. ^ Here's how Aerojet Rocketdyne might bring 5,000 new aerospace engineering jobs to Huntsville
  3. ^ "Aerojet Rocketdyne 3D Prints An Entire Engine in Just Three Parts". 2014-06-26. Retrieved 2014-08-08. 
  4. ^ Butler, Amy (2014-06-03). "Aerojet Rocketdyne Targets $25 Million Per Pair For AR-1 Engines". Aviation Week. Retrieved 2014-06-16. "Aerojet Rocketdyne is targeting a cost of $20–25 million for each pair of new AR-1 engines as the company continues to lobby the government to fund an all-new, U.S.-sourced rocket propulsion system ... The effort to build a new, 500,000-lb. thrust liquid oxygen/kerosene propulsion system would take about four years from contract award and cost roughly $800 million to $1 billion. Such an engine is eyed for United Launch Alliance’s (ULA) Atlas V rocket as well as Orbital’s Antares" 
  5. ^ Leone, Dan (2014-06-02). "Aerojet Rocketdyne Exec Pitches Long-brewing Concept as RD-180 Replacement". Space News. Retrieved 2014-06-16. 

External links[edit]