| Hadley | |
| Oxidiser: | LOX |
| Thrust(Sl): | 5000lbf |
| Fuel: | Kerosene |
| Type: | liquid |
| Cycle: | Staged combustion |
| Status: | Initial Production |
| Designer: | Ursa Major Technologies |
| Country Of Origin: | United States |
The Ursa Major Technologies Hadley is a 5000lbf thrust Kerosene/LOX oxidizer-rich staged combustion cycle rocket engine.
Hadley is the first engine developed by Ursa Major Technologies. It started development in 2015, and prototypes were test fired in 2018.[1] In March 2022 qualification of the engine was complete and flight-ready engines had been delivered to customers. In March 2024 Stratolaunch Systems announced completion of the first powered flight of the Talon-A test vehicle, TA-1.[2] Hadley is the engine powering Talon-A.[3]
Another initial customer, Phantom Space Corporation, plans to use Hadley on their Daytona small-lift rocket.[4] ABL Space Systems initially announced they would use the Hadley engine for the upper-stage of their RS1 rocket, but have subsequently decided to use an internally-developed engine called E2.[5] In April 2023, Astra suggested the vacuum variant of the Hadley engine would power the second stage of their Rocket 4.0 launch vehicle.