Lqf+Ox to LH2+Ox Conversion Calculator

[AtomicTech]

As the title infers, I need a calculator to convert an existing liquid fuel + oxidizer tank to have LH2 + oxidizer and also one for fuel consumption ratios for a mod that I'm working on

[JadeOfMaar]

@AtomicTech Hi again. Converting an LFO tank to LH2O is very simple but busy work that's handled automatically by CryoTanks's own catch-all patch for any part that is an LFO tank but isn't also an engine. This busy work is also conditionally done by Rational Resources. You don't have to do anything there.

Spoiler

But if you insist, presumably to dodge depending on CryoTanks, the procedure is:

• Get the sum of the units of LF and OX. This is used as the volume. Example, 360 LF + 440 OX = 800 total. The 800 is treated as liters and is used as the value of a B9PS baseVolume key.
• Get the values (unitsPerVolume) of the B9 tank types you're interested in. These are in CryoTanks' fuel tank types config.
  • LH2O in particular has 4.995 for LH2 and 0.333 for OX.
• Simply multiply the units per volume by the base volume. There's your hand-made CryoTank.
  • 4.995 * 800 = 3996 LH2
  • 0.333 * 800 = 266.4 OX

In case you or other players want to use other cryo fuels later on, you're making trouble for yourself by not allowing for the auto-magic configs. But when there's a will there's (hopefully) a config.

There's a fuel flow calculator (MS Excel format) on the RR GitHub. It will allow you to finely tune and preview your in-game engine demands.

If you're looking for a reference table of propellant ratios for engines, I don't have that. I tend to dig through Nertea's engine mods for whatever engine type is relevant and take the ratios from there.

Edited May 4, 2023 by JadeOfMaar

[AtomicTech]

10 hours ago, JadeOfMaar said:

Hi again.

Hello! Glad to see you stop by

10 hours ago, JadeOfMaar said:

@AtomicTech Hi again. Converting an LFO tank to LH2O is very simple but busy work that's handled automatically by CryoTanks's own catch-all patch for any part that is an LFO tank but isn't also an engine. This busy work is also conditionally done by Rational Resources. You don't have to do anything there.

  Hide contents

But if you insist, presumably to dodge depending on CryoTanks, the procedure is:

• Get the sum of the units of LF and OX. This is used as the volume. Example, 360 LF + 440 OX = 800 total. The 800 is treated as liters and is used as the value of a B9PS baseVolume key.
• Get the values (unitsPerVolume) of the B9 tank types you're interested in. These are in CryoTanks' fuel tank types config.
  • LH2O in particular has 4.995 for LH2 and 0.333 for OX.
• Simply multiply the units per volume by the base volume. There's your hand-made CryoTank.
  • 4.995 * 800 = 3996 LH2
  • 0.333 * 800 = 266.4 OX

In case you or other players want to use other cryo fuels later on, you're making trouble for yourself by not allowing for the auto-magic configs. But when there's a will there's (hopefully) a config.

There's a fuel flow calculator (MS Excel format) on the RR GitHub. It will allow you to finely tune and preview your in-game engine demands.

If you're looking for a reference table of propellant ratios for engines, I don't have that. I tend to dig through Nertea's engine mods for whatever engine type is relevant and take the ratios from there.

Copy that

What I'm working on is making a patch for KROMBUS (https://spacedock.info/mod/3360/The KROMBUS Project) and if CryoTanks does fufill the tank requirements, I'll just need to make a patch for the engine(s).

Thanks @JadeOfMaar 

[Ultim32]

@JadeOfMaar, would this same formula apply to an isru? I would like to add a variant to either the KPBS ISRU or the stock ISRU, but I didn't know where I should look for guidance.

[JadeOfMaar]

@Ultim32 Yes it would. CryoTanks has an opt-in config through which ISRU parts are tagged to have CryoTanks' converter recipes added onto them. If it makes LF and LFO it'll make Hydrogen and Methane. You only need to produce a new config like the linked one and change the part names to whatever you're aiming at (but CryoTanks handles Squad's parts and KPBS already so I would like for you to explain this "variant" and why it's still necessary).

 

[Ultim32]

I wanted to use the Community Resource Pack liquid hydrogen resource without having to download cryotanks. 

[JadeOfMaar]

1 hour ago, Ultim32 said:

I wanted to use the Community Resource Pack liquid hydrogen resource without having to download cryotanks. 

Ah. Well you're going to have to learn to use MM and to copy and edit an ISRU config (which will seem like plenty work at first). Feel free to study and copy from CryoTanks or Rational Resources Companion.

[Ultim32]

Ok, thanks