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KSP: 1.6.1.2401 MM: 4.0.2 CRP: 1.0.0 Kerbalism: 2.1.2 I did a bit more digging to see if I could reproduce the bug. It seems the issue is with the kerbalism-container-radial* parts, specifically when being placed symmetrically. They can be placed individually without any issue, but the symmetry function causes only one part to be visible and I'm no longer able to place the object. It also causes a bit of lag, so I assume there's something funny going on behind the scenes.

There seems to be some bug with attaching the radial tanks including with Kerbalism. It's extremely difficult to get them to attach.

Thanks for the welcome! And you are right, but I think you misunderstand me. I've taken a few classes on rocketry and aerodynamics, so let me rephrase. NERVAs and nuclear ramjets both function by passing gas over an extremely hot substrate. NERVAs simply carry their own supply, nuclear ramjets use whatever gas they happen to pick up. I don't know of any examples, but in principle an engine could conceivably be designed to do both. Nuclear ramjets do lose thrust with altitude as there is less atmosphere passing through the engine to be heated and expanded, no different than a normal jet really. I don't know what the thrust profile of a NERVA is in the atmosphere, certainly the plume would be under-expanded in anything more than a vacuum, but I don't think anybody would be crazy enough to try that in reality anyway haha. And I've never heard of a nuclear air augmented rocket. Sounds interesting.

Hi Yeon. Fantastic looking models, your mod really has some potential. I've lurked here for years but you convinced me to join to give you a suggestion regarding your ky engines. So you want an air breathing engine that runs independent of oxygen? You might want to model them after nuclear ramjets. They take any intake gas and heat it by putting it into contact with waste heat from a nuclear reactor. No combustion necessary. Thrust will decrease with decreasing pressure, however this can be offset by running the reactor hotter. You could model this as the engine overheating as it takes in lower density atmosphere. Incidentally this is also how a NERVA engine works, so if you are so inclined you could include an alternate mode which uses on board fuel for performance in a vacuum. The current stock NERVAs use fuel and oxidizer, however this isn't correct. In reality they only consume hydrogen gas (fuel).