Isonan

EDIT: I find a way to remove it from non RO section. There is 1 side question below. So I'm trying to add engine and reuse the model from RO Engine but I faced some problems. If there is a guide please link it. So it still show in non RO section it. Here is the engine part cfg file. And here is the engine file . 1 side question How to calculate the fuel needed for a given mixture ratio of the engine ?