AJ-10
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| Country of Origin |  United States |
| Date | 1957— |
| Manufacturer | Aerojet |
| Application | Upper stage/Spacecraft propulsion |
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| Propellant | N2O4 / Aerozine 50 |
| Used in | Delta-K Orion Transtage |
The AJ-10 is a hypergolic rocket engine. It has been used to propel the upper stages of several carrier rockets, including the Delta II and Titan III. It will also be used as the main engine of the Orion Crew Exploration Vehicle for NASA's Project Constellation.
It was first used in the second stage, Able, of the Vanguard rocket, in the AJ-10-118 configuration. It was fuelled by nitric acid and UDMH. A first stage problem caused the rocket to explode on the launch pad on its maiden flight, which occurred on 6 December 1957. Another launch attempt, on 5 February 1958, also failed during the first stage burn. An AJ-10 engine was first fired during the third Vanguard launch, on 17 March 1958, which successfully placed the Vanguard 1 satellite into orbit.
The AJ-10-101 engine was used on an uprated version of the Able, used on Atlas and Thor rockets. The first flight, of a Thor-Able, occurred on 23 April 1958, however the Thor failed before the upper stage fired. The second flight, which saw the first firing of an AJ-10-101 engine, occurred on 10 July 1958.[1]
The version currently in use on the Delta II rocket's upper stage, the Delta-K, is the AJ-10-118K.
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