RD-3.5
SR Space
Reusable liquid oxygen/methane rocket engine powering the Cosmos first stage and Stalker second stage.
Technical specifications
- Propellants
- Liquid oxygen and methane
- Thrust (sea level)
- 3.03 tf
- Thrust (vacuum)
- 3.56 tf
- Specific impulse (sea level)
- 294.8 s
- Specific impulse (vacuum)
- 346.8 s
- Cycle
- Open cycle
- Reusability
- Reusable, designed for multiple missions
About
RD-3.5 is a liquid-propellant rocket engine developed by SR Space, built in an open-cycle layout and burning oxygen and methane. Like the RD-1, it is designed for reuse across multiple missions. A single RD-3.5 engine powers the first stage of the Cosmos ultra-small-lift launch vehicle, and another powers the second stage of the Stalker launch vehicle.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
