CLLARE Propulsion Module
From CSTART Wiki
The CLLARE Orbital Bus is a cylindrical spacecraft module consisting primarily of a large propellant tank and a cross-shaped cluster of small rocket engines, with a hardware/software interface to communicate with the CLLARE Command Module. The PM will be used for missions requiring substantial delta-v in orbit, such as lunar flyby and lunar landing missions. The PM comes in two variants, the Light (LMH) and Heavy (PMH), which differ only in the size of their tanks.
- Helium pressurant
- Cryogenic tank with insulating bulkhead
- No outer structure, strength provided by propellant pressure
- Cross-shaped engine arrangement allows steering
 Propellant tank
 Engine cluster
The actual engines in the enginge cluster are exactly the same as the engine in the CLLARE Lunar Lander. This approach results in only a single liquid fuelled rocket in the entire hardware stack, reducing R&D requirements if we develop our own engine technology and simplifying procurement if we buy commercial engines.