Hadley engine

The Ursa Major Technologies Hadley is a 22-kilonewton (5,000 lbf) thrust Kerosene/LOX oxidizer-rich staged combustion cycle rocket engine.

Hadley

Country of origin	United States
Designer	Ursa Major Technologies
Status	Initial Production
Liquid-fuel engine
Propellant	LOX / Kerosene
Cycle	Staged combustion
Performance
Thrust, sea-level	5,000 lbf (22 kN)

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.^[2] In March 2024 Stratolaunch Systems announced completion of the first powered flight of the Talon-A test vehicle, TA-1.^[3] Hadley is the engine powering Talon-A.^[4]

Another initial customer, Phantom Space Corporation, plans to use Hadley on their Daytona small-lift rocket.^[2] ABL Space Systems initially announced they would use the Hadley engine for the upper-stage^[1] 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.^[6]