Cosmos
SR Space
Two-stage, ultra-small-lift launch vehicle for dedicated launches of small spacecraft.
Technical specifications
- Launch mass
- 13.5 t
- Length
- 22 m
- Diameter
- 1.2 m
- Propellants
- Liquid oxygen and methane
- Payload capacity
- 390 kg to 200 km LEO; 310 kg to 400 km SSO; 200 kg to 700 km SSO
- First stage length
- 13 m
- First stage engine
- 1x RD-3.5 (open cycle)
- First stage thrust (sea level)
- 3.03 tf
- First stage thrust (vacuum)
- 3.56 tf
- First stage specific impulse (sea level)
- 294.8 s
- First stage specific impulse (vacuum)
- 346.8 s
- Second stage length
- 6 m
- Second stage thrust (vacuum)
- 1.0 tf
- Second stage specific impulse (vacuum)
- 348.1 s
- Payload fairing
- 1.2 m diameter x 3 m length
About
Cosmos is a two-stage, ultra-small-lift orbital launch vehicle developed by SR Space, designed to launch small spacecraft into orbit. Like the larger Stalker vehicle, Cosmos uses liquid oxygen and methane propellants and features reusable engines.
The first stage is powered by a single RD-3.5 engine built in an open-cycle layout, while the second stage uses a smaller liquid-propellant engine. The payload fairing is manufactured from composite materials developed by SR Space. Cosmos can deliver between 200 kg (700 km SSO) and 390 kg (200 km LEO) of payload, targeting a low launch cost for small-satellite operators.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
