So... in a continuation of what I started here and here, I'm going to delve into Variable Fighter Master File: VF-31 Siegfried to see if I can't figure out what sets the /FC1 and /FC2 engine designs used by the YF-29, YF-30, VF-31 Siegfried Custom, and Sv-262 apart from the regular FF-3001. One thing that's apparent is that the picture they used for the VF-31 Custom Siegfried's FF-3001/FC2 Stage IIC thermonuclear reaction turbine engine is almost exactly the same image used for the FF-3001A
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