rsparkyc

[1.6.1] EMRController: v1.6.1 3/12/19

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Don't you hate it when you have too much fuel/oxidizer laying around?  Which you could change the mixture ratio that your engines use (like the J-2 did in real life)?  Want no more.  Introducing: EMRController

With this mod, you can configure your engines to use different oxidizer/fuel mixtures, and have the ISP and thrust adjust accordingly.  You can even set up your engine to run in "Closed Loop" mode, emptying your tanks at the end of a burn.

This mod does not contain any configurations, but if you use Realism Overhaul, you'll see that the J-2 does have configurations that work with this mod.

Download:

Github

View the Source

cfg changes powered by sarbian & ialdabaoth's ModuleManager plugin.


 

Changelog:

 
Spoiler

1.6.1 KSP 1.6.1

1.5.1 KSP 1.5.1

1.4.5 KSP 1.4.5

1.3.1 Fixed bug where oxidizer wasn't being properly detected when playing mostly stock before engine was turned on

1.3.0 Update for KSP 1.4.3

1.2.0 Update for KSP 1.4.2

1.1.0: Update for KSP 1.3.1

1.0.0: Initial Release

 
Edited by rsparkyc
version update

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Just wondering if this works, because that would be nice.

m9gl7CC.jpg

The thrust isn't as clear it ranges from 500kN to 1mN on the Y axis, 750kN to 1mN would have been better...

4.5:1 - 5.5:1
Mass Ratio (LO2:LH2) Isp (s) Thrust (kN)
5.5:1 424 1001.6
5:1 427 931.1
4.5:1 390 779.5

 

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On 4/1/2019 at 7:30 AM, Anders Kerman said:

Just wondering if this works, because that would be nice.

m9gl7CC.jpg

The thrust isn't as clear it ranges from 500kN to 1mN on the Y axis, 750kN to 1mN would have been better...

4.5:1 - 5.5:1
Mass Ratio (LO2:LH2) Isp (s) Thrust (kN)
5.5:1 424 1001.6
5:1 427 931.1
4.5:1 390 779.5

 

Just getting back into KSP, but I did some work on the J-2 engine in realism overhaul, might be worth taking a look.  You could make the above curve using MM, but I find it interesting that your curve has ISP dropping below a 5:1 ratio.  IRL, the reason your getting reduced thrust as your reduce oxidizer is that you're getting incomplete combustion, and have extra (unburnt) hydrogen leaving in the exhaust gasses.  The extra (high velocity) hydrogen atoms are what wind up boosting ISP.  While it is lower thrust, I think ISP would continue to rise.  Another good chart is figure 5-8 on page 5-11 here: https://history.nasa.gov/afj/ap12fj/pdf/a12_sa507-flightmanual.pdf.  There it shows ISP continuing to rise.  You can see what I did for realism overhaul here:
https://github.com/KSP-RO/RealismOverhaul/blob/master/GameData/RealismOverhaul/RO_SuggestedMods/EMRController/J2.cfg

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