I still think people aren't getting the timeline of the Franz Joseph ships. So I made a fun graphic to help explain it. I had been planing to do this anyhow for my own purposes. This thread just got me to go ahead and get it done!
I cite three episodes here: "Where No Man Has Gone Before" and "All Our Yesterdays" as these start and stop the series. (I didn't reference "Turnabout Intruder" as AOY has a later stardate.) Also I mention "Tomorrow is Yesterday" as that's when Kirk claims there are "only twelve like her in the fleet."
Notice that there are a multitude of classes here, not just five. I've color-coded them in blocs according to the sequence they are ordered in, the first ship's are red, the next step up is blue, the next step up is green and the last revisions are yellow. Notice in the case of the
Achernar and
Tikopai classes as well as the
Doppler and
Dollard classes have the same model number (MK-IXB and MK-VIB respectively) I wonder what the differences are? Maybe they represent classes which have the same mission capabilities but one is the deluxe model and the other is the economy version, without the wood paneling and plush carpeting...
So, you see, that for most of the run of the show, there really weren't all of those ships listed in the TM. When Kirk claim's to Captain Christopher that "there are only twelve like her in the fleet", he is in agreement with Franz Joseph. The Dreadnoughts weren't ever authorized before the end of the series. So, naturally they weren't called on during the run of the show.
There are some problems, specifically with the first ships being authorized on 0965, as that wouldn't be very long at all before WNMHGB. This doesn't allow near enough time for Spock's eleven years with Pike aboard the
Enterprise, or Kirk to have been with the
Farragut when it was attacked by the dikoronium cloud creature, or for the
Valiant to have been destroyed 50 years prior to "A Taste of Armageddon." All this could be resolved if we assume that
Farragut and
Valiant were not Connies but older ships which FJ mistakenly included and the original authorization should have been for 12 really. Also, I would assume that these ships were originally built as ships of an Earth fleet that predated the Federation and were "authorized" in the sense of them being adopted into the multi-national Federation Star Fleet.
There are plenty of references in
Star Trek that seem to infer the the Federation is a fairly new entity, early episodes keep referring to E.U.S.P.A. and saying the
Enterprise is an "Earth ship". in "Whom God's Destroy" it's said the Captain Garth's actions allowed Kirk and Spock to be brothers. This has been at times interpreted as being involved in the founding of the Federation. If the Federation was indeed a very new organization by Kirk's voyage, then the TM info makes a bit more sense. Bear in mind that the chronology with the Federation having been founded in 2161 wasn't nailed down until the 90's. In the early 70's when FJ was making the tech manual, it could have been much more recent. And, taken in isolation of
just TOS, it makes sense.
And, also, let's not forget that these are the
appropriation orders. From the day these are signed to the day a ship is finished and launched will be probably at least a few years.
The
Bonhomme Richard heavy cruisers wouldn't have even been ordered until after Kirk claimed 12 ships and they likely wouldn't have been finished and launched till the very end of the series or maybe even slightly after.
The Dreadnoughts would have been pretty new by the time they the
Entente was receiving calls from
Epsilon IX on stardate 7412 in TMP.
This actually sort of jives with later
Trek also. In ST5 and ST6 there were other ships available, but not experienced captains. Kirk was being tapped because he was Kirk, not because he was the only option. This suggests that there are a larger number of ships flying but there are few experienced captains of Kirk's generation, as he started into this whole starship command business back when there weren't many starships at all. Now there's over a hundred ships but only a dozen seasoned commanders. This trend of building lots more ships keeps going til the 2360's and 70's where it seems like Starfleet has thousands of ships. The
Achernars and the
Tikopais are the start of that trend.
So, anyhow, it makes sense to me. I hope this helps...
--Alex