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Though not inspired by that particular ship, I was going for a whole space plane vibe.
I was really hoping for a 'T2's bigger brother' look by the time I finished with it.
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Reaction Mass (remass) Is what engines throw out the back for thrust. For some rockets that can also be fuel like when chemicals are mixed for an explosion. In these engines, however, the engine superheats an inert material before tossing it out the back of the ship for thrust. In this case fuel for the engines and the reaction mass to provide thrust are separate things.
I added a few lines to the remass tank section to clarify this.
T designates shuttle, 4 indicates that it is the 4th design.
The KFY naturally have a T4, as well as NAM, under the standard nomenclature system. The difference is designated by the Na part of the name.
There is a T3 floating around on my computer but I'm unhappy with it so it hasn't been put up for approval yet. The unfinished but in-progress projects are the reason that NAM tends to jump around a little bit in its product naming.