Both. This will get clearer once I get the failure rates showing in the GUI, but it works like this: So let's say you've just researched an engine, and never used it before on any build in that save. The very first time you put that engine on a rocket, that engine has a 50% chance of failing. If it survives the flight, and you then use SY to apply the inventory next time, the failure rate is then determined by how many times it's been recovered (without going into the math, basica
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