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ISP from different engines


Fri3s3N
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Alright. Let me make on thing clear. I know how to calculate delta v. I have the math done and burned into my head. But I cam across a problem, how do I get the ISP, for different engines on the same stage? So say if I have a "MainSail" and a "Thud" sharing the same fuel on the same stage, how to I get the ISP to put into my formula?

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http://wiki.kerbalspaceprogram.com/wiki/Cheat_sheet

Look for: Isp = ( F1 + F2 + ... ) / ( ( F1 / Isp1 ) + ( F2 / Isp2 ) + ... )

 

It's a long time since i last used the cheat sheet :-)

Edit: just saw this has allreday been answered in your thread in Gameplay-Questions ... nevermind

Edited by Green Baron
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