3D‑Printed Rocket Engine
- Engineers reported designing and 3D-printing a rocket engine in just two weeks using novel geometries. - The work combined rapid additive manufacturing with new geometry approaches to accelerate development timelines. - Faster design-to-print cycles like this could shrink prototype lead times for aerospace components and speed validation ( ).
A rocket engine is a metal chamber that burns fuel and oxidizer so hot that its walls have to be cooled from the inside while it runs. Engineers at Dubai-based LEAP 71 said they designed one, printed it in copper, and hot-fired it after a two-week development cycle. (leap71.com) LEAP 71 said the engine produced 5 kilonewtons of thrust, or about 1,124 pounds-force, in a June 18, 2024 test at Airborne Engineering’s J1 facility in the United Kingdom. The company said the thruster completed a long-duration burn and generated about 20,000 horsepower. (leap71.com) The engine burned kerosene and cryogenic liquid oxygen, a common liquid-propellant combination known as kerolox. LEAP 71 said its Noyron computational model generated the design without conventional computer-aided design work, and German manufacturer AMCM printed the part in copper. (leap71.com, metal-am.com) A liquid rocket engine usually needs internal cooling passages because combustion temperatures can exceed what the chamber wall can survive on its own. NASA has said additive manufacturing is attractive for engines because it can combine what used to be hundreds of small parts into a few large pieces and build hardware much faster. (nasa.gov) That matters in propulsion because engine hardware tends to be the slowest and riskiest part of launch-vehicle development. NASA said rocket engines have the longest developmental lead times on a vehicle, while selective laser melting and related printing methods can produce complex cooled liners in hours instead of machining and brazing many separate parts. (spinoff.nasa.gov, techport.nasa.gov) The geometry angle is central to the claim. Additive manufacturing lets engineers print shapes that are hard or impossible to machine conventionally, including injector elements and regenerative cooling channels that snake through the chamber wall like plumbing cast inside the metal. (skyrora.com, nasa.gov) LEAP 71’s engine was not a full orbital launch engine; at 5 kilonewtons, it was a small thruster-scale demonstration. The company has since said it was moving from that test article to larger methane-liquid oxygen reference engines, including a 200 kilonewton aerospike concept shown in March 2026. (leap71.com, voxelmatters.com) The broader industry has been pushing the same manufacturing logic for years. Relativity Space said its Terran 1 vehicle was 85% 3D-printed by mass, and NASA has separately tested printed aluminum engine nozzles to cut cost, weight, and part count. (relativityspace.com, nasa.gov) The open question is how far a two-week design-to-print cycle scales from a small test engine to flight-qualified propulsion systems with pumps, valves, and repeated qualification runs. For now, the result shows how fast a rocket engine can move from software to fire test when the geometry, material, and printer are all set up for the same job. (leap71.com, spinoff.nasa.gov)
