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delta v calculations in VAB bug


Tapeta

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KSP Version: 0.1.2.0 22258

Windows 11 Home
CPU: AMD Ryzen 7 5800H
GPU: NVIDIA GeForce RTX 3070 Laptop

The calculation of delta v is wrong in case you put small fuel tank (HFT-S-250 or HFT-S-375 or HFT-S-250) below big fuel tank (HFT-T-250 or HFT-T-375 or HFT-T-250) and you are using engine LV-N "Nerv". The same thing is true for engine Mk55 "Thud" and fuel tanks: FL-T800 and FL-T100.

If you put small fuel tank above big fuel tank the calculation is right.

I have no mods installed.

 

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18 hours ago, Kim Hanson said:

Furthermore, it can read one value in VAB and another on the launchpad.

I believe we are supposed to see different values in the VAB and the launchpad.  In the VAB we are shown vacuum dV.  On the launch pad we get "sea level Kerbin atmosphere" dV.

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I believe @Poppa Wheelie is correct, the below quote was in the Launch Day Notes as something they were working on.

"All delta-v numbers in the VAB use vacuum specific impulse numbers, which affects their accuracy. This will be adjusted in a future update. Delta-v numbers shown in the staging stack during flight dynamically reflect the current flight state."

 

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