This is baisically a nuclear thermal rocket, (NTR), cool!
This is a common problem.
I saw rocket engine so I clicked, I thought it was off or smth so I went searching and then I realized that the BOYL was being launched, but it was that dark and hidden with the background that I couldn't see it lol.
at this point im just questioning everything, should i stop?
well there is no supersonic flow in tpt. why use a converging diverging nozzle (almost EVERYBODY does...)
there is nothing special about the nozzle
what would someone make a comment about anymore, the nozzle maybe
I'm still waiting for comments....
I know that all gases must expand