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This is a mod that adjust propellent utilization on engines, as was done in | ||
real life on the J-2 rocket engine. | ||
What does this mod do? | ||
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This is a mod that adjust propellent utilization on engines, as was done in real life on the | ||
J-2 rocket engine. EMR stands for Engine Mixture Ratio | ||
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## How do I use it | ||
ERMController works in two modes: "open", and "closed" loop modes. Open loop takes the | ||
Oxidizer:Fuel mixture ratio you want to use, and runs the engine at that mixture. Closed loop | ||
takes a look at your remaining fuel, and continually adjusts your mixture ratio to exhaust | ||
both fuel and oxidizer at the same time. | ||
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We'll cover how to | ||
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1. Set up an EMRController configured engine in the VAB, and | ||
2. Use that engine in flight | ||
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### VAB | ||
In the VAB, the first step is to click the `Enable EMR` button. By doing so, you'll get a wide range | ||
of options to configure: | ||
![EMR VAB](https://cdn.pbrd.co/images/aLvhhUTyE.png) | ||
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`Starting EMR`: This is the mixture ratio the engine will (by default) start at | ||
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`Final EMR`: this is the mixture ratio the engines will (ideally) end at | ||
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> Note: Both Starting and Final EMR have vacuum ISP and Thrust displays visible | ||
`Percentage at Final EMR`: This is the percentage of fuel you plan to use at your Final EMR | ||
(This is used to determine how much fuel we should put in our tanks) | ||
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`Boiloff Reserve Percentage`: If you're using a mod that simulates propellent boiloff, | ||
this slider allows us to add up to 50% more fuel or oxidizer, whichever you want to have more of. | ||
Drag right for fuel (the more common choice), or right for oxidizer. | ||
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Now when you add your fuel (assuming you're using RealFuels), the fuel tank should properly select the | ||
right mixture for you. | ||
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### In Flight | ||
![EMR In Flight](https://cdn.pbrd.co/images/aM2yq3O7x.png) | ||
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When operating in Open Loop, the following options are available: | ||
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`Current EMR`: The currently active EMR (again, with Vac ISP and Thrust values below) | ||
`Reserve`: Assuming you stayed at the current EMR, you would be left with this much fuel/oxidizer | ||
`Change to Closed Loop (X.X:1)`: clicking this will switch you to Closed Loop mode, | ||
which would change your EMR to X.X:1 | ||
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Clicking on that, the UI changes. The slider for `Current EMR` gets replaced by text that updates, | ||
and generally, `Reserve` will show "None". An exception to this is when Closed Loop mode is | ||
operating at the configured EMR limits | ||
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## Configuration | ||
Each configuration for an EMRController module takes 2 MIXTURE configs | ||
(an upper and lower limit.) There are some key parameters on a MIXTURE | ||
config as follows: | ||
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configName: if using ModuleEngineConfigs, you can specify the config this | ||
MIXTURE should be applied to | ||
configName: if using ModuleEngineConfigs, you can specify the config this | ||
MIXTURE should be applied to | ||
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ratio: the oxidizer:fuel ratio that this mixture uses. | ||
Note: this is by mass (and not volume, as is what KSP normally uses) | ||
ratio: the oxidizer:fuel ratio that this mixture uses. | ||
Note: this is by mass (and not volume, as is what KSP normally uses) | ||
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maxThrust: The maximum thrust this engine produces at this ratio | ||
maxThrust: The maximum thrust this engine produces at this ratio | ||
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minThrust: The minimum thrust this engine produces at this ratio | ||
This is optional, and defaults to 0 | ||
minThrust: The minimum thrust this engine produces at this ratio | ||
This is optional, and defaults to 0 | ||
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atmosphericCurve: a standard FloatCurve for the ISP at this MIXTURE | ||
atmosphericCurve: a standard FloatCurve for the ISP at this MIXTURE | ||
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A sample MM config: | ||
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@PART[liquidEngine2]:FOR[EMRController] | ||
{ | ||
MODULE | ||
{ | ||
name = EMRController | ||
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MIXTURE | ||
{ | ||
configName = something | ||
ratio = 1 | ||
maxThrust = 200 | ||
minThrust = 0 | ||
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atmosphereCurve | ||
{ | ||
key = 0 325 | ||
key = 1 260 | ||
key = 6 0.001 | ||
} | ||
} | ||
MIXTURE | ||
{ | ||
configName = something | ||
ratio = 1.5 | ||
maxThrust = 300 | ||
minThrust = 0 | ||
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atmosphereCurve | ||
{ | ||
key = 0 300 | ||
key = 1 200 | ||
key = 6 0.001 | ||
} | ||
} | ||
} | ||
} | ||
@PART[liquidEngine2]:FOR[EMRController] | ||
{ | ||
MODULE | ||
{ | ||
name = EMRController | ||
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MIXTURE | ||
{ | ||
configName = something | ||
ratio = 1 | ||
maxThrust = 200 | ||
minThrust = 0 | ||
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atmosphereCurve | ||
{ | ||
key = 0 325 | ||
key = 1 260 | ||
key = 6 0.001 | ||
} | ||
} | ||
MIXTURE | ||
{ | ||
configName = something | ||
ratio = 1.5 | ||
maxThrust = 300 | ||
minThrust = 0 | ||
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atmosphereCurve | ||
{ | ||
key = 0 300 | ||
key = 1 200 | ||
key = 6 0.001 | ||
} | ||
} | ||
} | ||
} | ||
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