I have a balance question, can someone explain to me the reason for the dry mass to fuel ratio of ~3 for the cryogenic tanks with LH2 versus around 8 for any other tank with LF/OX.
I get that LH2 is less dense (more volume required), but wouldn't that also mean that the tank doesn't need to mass as much ? As an example, the max DV I can seem to get for a LV-N (no payload, just engine and tanks), is around 11k m/s. The theoretical maximum should be north of 21k I believe from other resources I've seen.
Maybe it's some mod in my GameData constellation that is causing the issue or I'm just not wrapping my head around it. As an example, the dry mass of the HI-530 is 28.8 tons with only 81 tons of fuel for a ratio of dry/fuel of around 2.8. A jumbo 64 is a ratio of 8.
As it stands now, Nuclear engines don't seem to have a place in the game. Using chemical engines can usually give me a little more delta-v (at the expense of overall mass) at a lot less cost and complexity.
I know I can use the LF-only patch, I really want to understand the LH2 mechanism though. Simple answer is to patch the cryo tanks to weigh less. And I may write a MM patch to do that for my game, but I'm curious the use cases people use these engines for. By the time you add radiators and the like to manage heat your delta-v is really taxed.
Thanks for the help.