3D-Printed Rocket Engine
❖ ISRO successfully conducted hot testing of liquid rocket engine manufactured through 3D printing technology. ❖ The engine used is the PS4 engine of PSLV upper stage. ❖ The same engine is also used in the Reaction Control System (RCS) of the first stage (PS1) of PSLV. ❖ The engine uses the earth-storable bipropellant combinations of Nitrogen Tetroxide as oxidizer and Mono Methyl Hydrazine as fuel.