Delta II Stage 2 Engine

The Delta II launch vehicle Stage 2 engine, designated AJ10-118k, is a pressure-fed engine having restart and thrust vector control capability. This engine utilizes N2O4 and A-50 storable propellants and has an ablative thrust chamber. The rated thrust is 9,850 lbf at altitude.

The AJ10-118k engine has a history dating back more than 50 years. It is currently being used on the United Launch Alliance Delta II vehicle for NASA spacecraft missions.

Aerojet Rocketdyne’s AJ10 has provided second-stage propulsion for more than 150 Delta II flights to date with a 100 percent success rate. The engine has helped deliver payloads for NASA’s space exploration efforts such as Phoenix Mars Lander, Mars Polar Lander, Deep Impact, Kepler, NEAR Shoemaker and the Mars Exploration Rovers, Spirit and Opportunity, as well as the U.S. Air Force Global Positioning System Block IIR fleet.

As a propulsion provider on every Delta II launch, Aerojet Rocketdyne has been trusted to deliver historic payloads that have expanded scientific knowledge and enhanced our nation’s space-based capabilities throughout these missions. The AJ10 engine and our team supporting it have achieved an unrivaled legacy of performance.