There are three easy ways to do engine bells in Blender I think of immediately: - vertex-sculpt from cylinder after hollowing it by boolean modifier (fast and easy) - grow from circle by extruding regions (moderate time and effort) - twisting curves that should match inner and outer walls (extra fast but you'll need good imagination. Inline 2.5-3.75m parts with radially attached radiators look more plausible. considering how much heat some of processes need or produce. One can use molecular sieves to remove CO2 from breatjing air for smallest light vehicles like drop pod, but for large scale procession it's a no-no IMHO. Why separate when you can integrate? On the other hand PSA/VPSA processes are best realistic non-cryogenic I can think of for atmospheric ISRU. Having two configs is not much harder then having one. GOOD option for those who hate to wait for RO/RSS or just like Kerbol system as it is. molten lead for example is one of plausible components to form Eve oceans. With such THICK atmosphere and so close to Kerbol Eve must have the same "greenhouse" problem as real Venus, so. Some species of real world microbes have much wierder biochemistry. But we are playing with aliens! Alien biology! Why can't we for example have radiosynthetic algae that uses local radiation to power CO2 conversion? It's plausible. Ok, Laythe is too far from Kerbol to recieve enough light for photosynthesis. Why do you think that gas giant satellite may not have free oxygen in atmosphere? Ok, for lifeless worlds it's almost impossible. A border between playable game and boring scientific project with plenty of calculations is not so wide. There is absolutely no fun to fight against real n-body physics without MechJeb to help or reworked patched conics calculator at least. That would call for development of some VERY powerful ingame instruments to play with. But I surely want to know which parts of each assembly should be modelled and which may be omitted, how they look and what are their relative dimensions. Why two? It's just a powerful fridge, no difference for variety of gases. More realistic is something like this NASA regolith excavator concept is some subtype of general rotor excavator. we have a choice between PSA/VPSA unit with it's own air intake and PSA/VPSA unit without that, relying on MM-modified stock air intakes. I already wrote about molecular sieves and you don't like the idea of cryogenic separator that ouputs liquid products, so. Useless without molecular sieves or PSA/VPSA unit or cryogenic separator. HTP is pretty crappy monopropellant (ISP = 161s) and not very stable oxidizer. Why not to pyrolise Hydrazine when you lack Nitrogen for example? It has something to do with ISRU? Hydrogen peroxide is decomposing by itself with a small amount of heat or light or you can just dip something silver into it for reaction start. It looks a good idea to have a general pyroliser unit for all reactions of that type. Gas fraction pyroliser is even simpler in construction. Then there will be a choice between synthezing CH4 for fuel or saving that precious hydrogen for drinkable water and burn ineffective CO instead. CO usefullness is questionable until RF will treat it as legitimate fuel and RISRU reach the point of operating asteroid resources. Electrolyser, Sabatier reactor and Pyroliser cover all needed conversions between H2O, CO2, O2 and CH4.
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