I started working on XS Venture APU systems simulation. APU is auxiliary power unit, and it drives hydraulic pumps to provide hydraulic pressure in all parts of the spacecraft, oil pumps to lubricate mechanics of APU itself, and fuel pump to pump fuel for APU and extra torque for primary fuel pumps (which are electric though).
APU itself is a turbine – hydrazine is pumped and mixed with catalyst (like Shell 405), and reaction occurs, which generates heat (a lot of heat), and also gas. The gas is allowed to go through turbine, spinning it up. Computer systems control pressure by pulsing valves, which also changes RPM of the turbine.
Here’s part of the APU panel (which is used to start up and control it):
I also added technical documentation to SVN, which includes description for all sensors in the ship (so far 280 of them), various checklists (added as more and more systems work), and also I’ve wrote tetris for the on-board computer system:
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