Config Parameter Documentation

This documents the commonly tweakable parameters for the modules.

ProceduralSRB

Bell scaling

bellScaling = sqrt(thrust) / sqrt(thrustScaleFactor)

finalChokeDiameter = (bellChokeDiameter / 2) * bellScaling

The bell scale scales with the square root of the thrust. There was discussion about the ideal scaling law and that's what came up. This makes physical sense because you'd expect a constant ideal area-of-the-end-of-the-bell / thrust ratio (ie: constant pressure at the end of the bell) for increasing thrust.

The thrustScaleFactor doesn't actually mean anything physically, it's just the thrust such that the bell isn't scaled at all. Doubling this value will mean you'll get 2 times more thrust for the same sized bell.

The diameter of the choke (small end) of the bell is bellChokeDiameter / 2. This controls the maximum scaling, since you can be at most 50% of the width of the base. You could double the value if you didn't mind the bell choke being large for the SRB, but not more than that otherwise the choke will end up outside the base, which doesn't really make sense