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The Class XVI was a Mass-tonnage, from 350,000 to 400,000 of the Metric system, one of the most prominent being the Galaxy-Class Heavy Explorer, a once-unthinkable Mass Range, that only a few of the most advanced ranges of engine could even touch, and after the routinization of later tech, from mostly Excelsior-Class starships, this Class was the target of in increasing number of techs, new Classes, and all-new ambitious theories. The Class became more routine around the 2380s. FASA
Early history (23rd century)
The Class XVI-XX Range was a highly theoretical Range, and intended to be the bulk of upgoing starship studies, mostly by Medusans and Ancient/Far Advanced Engineering Studieers, often skeptical, in views and progress, with more engines used to test the way into this range, although even they were often in jeopardy themselves.
The Class XVI range soon led to similar theoretical/Class design practices to Class XVII and up, in the 2390s, and 2410s, in that this class was the (albeit) indirect step to further directions, even to the weary. Star Trek: The Next Generation Technical Manual
The Success of the Galaxy, and going into the mainstream made this Class even more prominent, even down to the smaller details.
-Over 24 newer crew rooms
-Over 6-9 different laboratories
-up to two additional primary reactors, and four additional backup reactors
-In some architectural changes, even an additional shuttlebay, although the size of which is the other rock, the other problem these designers often faced.
-more room for Auxiliary Control, and some machinery and scientific areas, constantly arranged according to a number of factors, often comfort-oriented