Indian startup Othisis test-fires 3D-printed fully cryogenic reusable rocket engine

Othisis Tests 3D-Printed Cryogenic Engine

Indian startup Othisis has conducted a stationary test-fire of its first 3D-printed, fully cryogenic rocket engine prototype. This marks a significant step for the two-year-old company, founded by Syed Affan.

Engine Specifications and Design

The unnamed engine is a 5 kN design that utilizes both liquid oxygen (LOX) and methane as propellants, kept in a chilled liquid state. Othisis intends this design for Vertical Take-off, Vertical Landing (VTVL) reusable applications. The design incorporates a chilled-fuel loop for cooling.

Advantages of Cryogenic Methane Fuel

Methane and LOX propellants offer a stronger burn than Kerolox and produce almost no residue, which can lower maintenance time and improve reusability turnaround. Both LOX and methane can theoretically be manufactured in-situ from CO2 and water. However, drawbacks include lower fuel density requiring larger tank sizes, trickier storage due to low temperatures, and potential handling hazards.

Role of SLM 3D Printing

The engine was manufactured using Selective Laser Melting (SLM) 3D printing. This process involves depositing layers of microscopic metal powder and melting them with a laser, creating layers approximately 0.05 to 0.06 mm thick. SLM allows for the use of metals and alloys not typically handled by consumer 3D printers, enabling complex designs for rocket components.

Future Outlook

Despite being a relatively new company, Othisis has reportedly signed Memorandums of Understanding (MoUs) to carry payloads into space. This indicates early industry interest in their propulsion technology.