Private space company Launcher demonstrated its E-2 rocket engine's capabilities on April 21st, 2022.
The E-2 is a "closed cycle 3D-printed, high-performance liquid rocket engine" that Launcher has developed for its Launcher Light launch vehicle, which has its inaugural launch scheduled for 2024. The Launcher Light will reach low-Earth orbit using only one E-2 engine while carrying a payload of 150 kilograms (330 pounds).
The successful test-fire of the engine was conducted at the NASA Stennis Space Center, producing ten metric tons of thrust (22,046 lbf, or pounds of force) and 100 bar (1,450 psi) of combustion pressure. The engine uses liquid oxygen (LOX) and kerosene fuel in a 2.62:1 ratio.
The E-2's combustion chamber is a single piece of 3D-printed copper chromium zirconium alloy (CuCrZr) instead of the typical aerospace-grade copper alloy. To print the chamber, Launcher partnered with AMCM to develop the AMCM M4K 3D printer, a large format (100 x 45 x 45 cm) custom 3D printer.
You can read more from Launcher's press release here.
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