Cabin Fire Flammability Envelope (2D)

Every crewed spacecraft has to choose a cabin oxygen fraction and total pressure that keeps ordinary habitat materials from sustaining a fire. This 2D counterpart of the 3D rig simulator renders the same segmented-swatch burn test as a side-view strip that chars and flames segment by segment, paired with a live LOI-vs-pressure threshold chart that plots the flammability boundary for cotton, paper, polyethylene wire insulation or fire-resistant Nomex and marks exactly where your chosen oxygen fraction and pressure sit relative to it. Live readouts track the O2 partial pressure, the pressure-adjusted flammability threshold, the safety margin and the modelled flame-spread rate, while the flame particle cloud itself changes shape between the buoyant plume of 1 g and the slower, near-spherical diffusion of microgravity. Drag the burn-test view to pan and scroll to zoom in on the char front.