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I think i found a way to stop the fuel from boiling away without installing extra mods! 1. Go to your KSP folder and enter the "Game Data" folder. 2. Go into the "Real fuels" folder and then into the "Resources" Folder. 3. Look for a file called "ResourceHsps.cfg" and enter it with notepad. It should look a bit like this: @RESOURCE_DEFINITION[LqdOxygen]:FOR[RealFuels] { %hsp = 0 // specific heat capacity (kJ/tonne-K as units) // recalc, mols are for O2 on wiki %vsp = 0 // heat of vapourization (KJ/tonne as units) %conductivity = 0.152 } ... 4. Look for this: @RESOURCE_DEFINITION[LqdOxygen]:FOR[RealFuels] { %hsp = 0 // specific heat capacity (kJ/tonne-K as units) // recalc, mols are for O2 on wiki %vsp = 0 // heat of vapourization (KJ/tonne as units) %conductivity = 0.152 } @RESOURCE_DEFINITION[LqdHydrogen]:FOR[RealFuels] { %hsp = 0 // specific heat capacity (kJ/tonne-K as units) // recalc, mols are for H2 on wiki %vsp = 0 // heat of vapourization (KJ/tonne as units) or 8.97 * 10^5 or 8.97E5? %conductivity = 0.072 } 5. Change the value of "%vsp = ..." to 0 at both fuels. 6. Save and enjoy the game without fuel boiloff! If somebody has a better solution please let me know!

Hello. 1.4.5.2243 I was using quad nuke engines for large craft long range travel. previously all using liquid fuel as only fuel source, and suddenly before landing i activate new stage and my engine flames out? tanks full of liquid fuel i was puzzled, then i suddenly realised the engine required LH2 as a fuel source? what even is this? I recently added new things to my tech tree to extend science collection but cannot see why that would mean all my nuke engines would need a different fuel source? Can anyone suggest what to do? my ship is stuck dead in orbit with a tank of useless fuel. Thank you kindly. Nick

Hello all, I am posting this here, because I have noticed some odd behaviour in conjunction with engines using liquid hydrogen (LH2), such as from the Cryo Engines pack by @Nertea or from BDB by @CobaltWolf. I am not posting the relevant threads, as I believe this is not a bug of these specific mods but rather something underlying, which makes these engines work. The issue is that with any LH2 engine, that I have used so far, the dV calculation within the game seems incorrect. This becomes apparent, when using a mod such as MechJeb and/or KER, which calculate the dV per stage and for the whole ship. Following please find some screenshots to illustrate what I am referring to: In the first screenshot, I am at the beginning of executing a manouver node of ~350m/s, I have 3,770m/s left in my rocket. You would expect that after the burn, you'd be left with ~3,418m/s. Instead, you end up with roughly twice the dV expended, with only 3,114m/s left in your rocket. FWIW, I installed KER as well, to see if the error can be traced back to some error with MechJeb, but this does not seem to be the case, as the remaining dV is calculated almost to the same value (#floatingpointerror) in both mods. Now, I do believe there is only one way to calculate the dV of a rocket, hence the error must be somewhere else?! I heard that others, @RocketPCGaming specifically, wondered about this inconsistency as well. As I have currently no idea, what might be causing this, I would like to stick some heads together to try and find the cause for this. As a start I would like to ask others, whether or not they have seen the same kind of behaviour and if so, was/is it similar to what I have seen (roughly twice the dV expended than anticipated) or was it a different kind of inconsistency? Your feedback will be very welcome!

For all those passionate players of RO/RSS who struggle with the boil off problem... I tried many different ways to handle those liquid fuels, tried radiators, heat pumps etc... As far as i can see... when you pass the 100x time warp (switching to analytic physics calculations) boil off happens... I found a way. I tweaked the realtanktypes.cfg (realfuels) and the rftanks.cfg (procedural parts) to get a tank type which prevents boil off. First it feels (and looks like) cheating I know... but considering that in the end every "feature" you need in space has to be paid with "weight" (insulation, radiator, electricity...), i suggest you alter the basemass to stay in a realistic scenario.... I´m not the author of the mentioned mods, i just edited the cfgs. Here is how.: \gamedata\realfuels\resources\RealTankTypes.cfg add.. //Ultra TANK_DEFINITION { name = Ultra highlyPressurized = False basemass = 0.000039 * volume outerInsulationFactor = 0.0005 TANK { name = LqdOxygen mass = 0.0000112 utilization = 1 fillable = True amount = 0.0 maxAmount = 0.0 wallThickness = 0.0025 wallConduction = 16 insulationThickness = 0.0381 insulationConduction = 0.014 temperature = 400.15 note = (has insulation) } TANK { name = LqdHydrogen mass = 0.0000016 utilization = 1 fillable = True amount = 0.0 maxAmount = 0.0 temperature = 400.15 wallThickness = 0.0025 wallConduction = 205 insulationThickness = 0.0381 insulationConduction = 0.014 note = (has insulation) } TANK { name = LqdAmmonia mass = 0.0000096 utilization = 1 fillable = True amount = 0.0 maxAmount = 0.0 temperature = 400.65 wallThickness = 0.0025 wallConduction = 205 insulationThickness = 0.0381 insulationConduction = 0.014 note = (has insulation) } TANK { name = LqdMethane mass = 0.0000096 utilization = 1 fillable = True amount = 0.0 maxAmount = 0.0 temperature = 400.45 wallThickness = 0.0025 wallConduction = 205 insulationThickness = 0.0381 insulationConduction = 0.014 note = (has insulation) } } \GameData\ProceduralParts\Parts\ZOtherMods\RFTank.cfg add the bold line.. { name = ModuleFuelTanks volume = 1060 utilizationTweakable = true type = Default typeAvailable = Default typeAvailable = Cryogenic typeAvailable = ServiceModule typeAvailable = Fuselage typeAvailable = Balloon typeAvailable = BalloonCryo typeAvailable = Structural typeAvailable = ElectricPropulsion typeAvailable = Ultra } } The temperature in the first cfg is the key... What it does....: Now it is possible to choose "ultra" as a procedural tank type which is capable to store the configured fuels up to the given temperature in K. Many thanx to all the modders out there who do a great job... P.S. please excuse the fact that i´m not a native speaker/writer