This is a question for
aridas sofia in relation to the numbers used in engine designations, such as LN-64 etc.
I always considered the numbers to be the year the engine was put into production or first used but notice that two engines noted in the Akyazi book are LN-91 and LN-94 but the noted publication date (in the trekverse) of the book is 2290?
Have I been wrong all along or is this an oversight from proofreading?
Is there a standard to the remainder of the designations like
Mod 1
PB-## (S) etc.
It’s pretty simple. The numbering of those nacelles was indeed meant to reflect the Earth year they were developed… and not reflect it. Think of how the US Army changed the numbering system for its long guns. You have M1903 and M1914 and then suddenly M1. They changed from basing the number on year of manufacture to order of development. That example was in my mind.
The thinking back in those long ago days was to keep it all a little loose and infer that more was going on than we were being explicit in explaining. So, infer that at one point the nacelles are numbered based on date of development - Earth date or some other planet’s date. A basically haphazard system that leads to some change that tries to make it all make sense. Which then causes a reaction against the change, and so on. We did that kind of thing here and there and just dropped the references in but never explained what was going on, to give the impression a lot more was going on.
As time has passed and the ability to keep complex stuff organized and straight has improved with computers, and exchanges such as this one between the people making the books and the people reading the books has proliferated, a lot of “filling between the lines” has gone on. But that doesn’t change the fact that at the beginning, it was much looser and inferential and not necessarily completely worked out. Hinting with the implication that if you were some officer or government official or manufacturer reading these publications, you were saavy enough to know why PB-30 clearly links with 2230 but PB-18 reflects a later refit of ships that were originally developed with pre-circumferential technology and were later refit with early circumferential nacelles. Etc etc and so on. Think the silhouettes on the starship recognition chart. Sometimes the less you show, the more interest you generate.
One more tidbit about PB-18: back then, the only authorative guide to the age of NCC-1701 was the statement in the supposedly authoritative TMoST that the Enterprise class of starships was fifty years old during TOS. By our reckoning, TOS was happening in 2268 - 300 years after TMoST was written (the 300 years being the reference from Miri). So, we had Enterprise being launched fifty years earlier, in 2218. And when it was launched, it was fit with the latest and greatest, first really tried and true, circumferential nacelles. PB-18. So, at the beginning, it set all the records. It was already a legendary ship by the time of April and Pike and Kirk. In our minds, that left almost limitless room for storytelling about the earlier adventures of NCC-1701. And peripherally, this technology got retrofit onto earlier ships, which is why the Horizons and Archons would have been shown with the same nacelles Enterprise was launched with.