Known dates-
2161 Starfleet founded
2196 Daedalus Class retired
2225 Commission date of first Constitution Class starship (Whitfield)
2245 USS Enterprise NCC-1701 commissioned
2285 USS Hathaway NCC-2593 commissioned
2287 First recorded use of present classification system-dedication plague of USS Enterprise NCC-1701-A (Constitution Class)
2293 USS Constellation NCC-1974 commissioned
Type and class
I recognize in the Star Trek universe that type and class are interchangeable-Type 6 shuttlecraft (Technical Manuel) and Class 6 shuttlecraft ("Suspicions").
My hypothesis-
Between the years 2161 and 2293, Starfleet uses a classification chart that employs alphabetical letters-A,B,C,etc. to identify the various starship classes. Two classes of ships are known from this chart-J, S (Constitution Class)-and covers other known starship classes-Antares, Constellation, Excelsior, Miranda, Oberth, and Soyuz. If the system is used, this equates to a total of 26 ship classes operating between 2161 and 2293. And, if when the Class Z is in operation, Starfleet has to decide which system to employ-name a class after the prototype or do a Class AA. Starfleet decides to do the former rather than the latter. Classes under the old system are modified-Class S ships became Constitution Class ships. There is a brief transition period from 2287 to 2293 when the modification is occuring. The USS Enterprise NCC-1701-A is one of the first starships to benefit from this change.
Further, under the old system, there is not the sequential ordering of registries. The Constellation Class is a class in point. USS Hathaway NCC-2593 is launched eight years before the USS Constellation NCC-1974, the "prototype" ship of the Constellation Class. It is possible that the USS Constitution NCC-1700 is launched after the first Constitution Class ship and that this ship has a higher registry than the USS Constitution NCC-1700.
For the record, this is my version of the list of Constitution Class ships (not in order of commissioning)-
Commissioned between 2225 and mid-2268 (Whitfield)
USS Constellation NCC-1017 (lost 2267)
USS Constitution NCC-1700 (refitted-"Data's Day")
USS Enterprise NCC-1701 (refitted-STTMP)
USS Essex NCC-1697
USS Excalibur NCC-1664
USS Exeter NCC-1672
USS Farrugut NCC-1647 (lost before 2265)
USS Hood NCC-1703
USS Intrepid NCC-1631 (lost 2268)
USS Kongo NCC-1710 (refitted)
USS Lexington NCC-1709
USS Potemkin NCC-1657 (refitted)
USS Republic NCC-1371 (refitted)
USS Valiant (lost before 2265; not USS Valiant NCC-1223)
USS Yorktown NCC-1717 (refitted)
Commission after mid-2268
USS Defiant NCC-1764
USS Eagle NCC-956
USS Endeavor NCC-1895
USS Enterprise NCC-1701-A
USS Kongo NCC-1710
USS Potemkin NCC-1657
USS Republic NCC-1371
Evidence of refitting-STTUC (okudagrams)
USS Defiant NCC-1764 (lost in 2268)
Out of curiosity, I adduce the time needed to build a Constitution Class ship. If the ships are built one after the other (15 ships in total) over a 43 year period, the time needed for construction is 2.9 years.
As far as the official designations in TOS are concerned, it could be possible that the class names were introduced as late as in the 24th century. Being much more convenient than mere letters, Starfleet could have decided to use them likewise for ships decommissioned a long time ago (Daedalus). Still, I don't see your point about naming the classes. Why is the Constitution class named for the Constitution if it's not the first of her class?
BTW: Welcome to the Forum, Trinculo
------------------
Early bird catches the gagh. (The Doctor to B'Elanna at 06:00, "Drone")
www.uni-siegen.de/~ihe/bs/startrek/
------------------
"The one, the only, THE 359!"
Another thing to think about. USS Galaxy NX-70637, launched in 2357. She was finally seen as NCC-70637 in 2375. That's 18 years. My guess is that it would be more along the lines of 5 - 15 years before an NX ship is changed to NCC. Excelsior was a bit short, being an NX for 5 years (2285 - 2290). Now, if Constellation went for the minimum, she would be launched in 2288. If she went for the maximum, she would be launched in 2278. So, by my guess, USS Constellation was launched around 2284, maming her 9 years old at the time she was in the Okudagram, this would also leave room for the most likely first production ship in the line, Hathaway
------------------
"The one, the only, THE 359!"
And my theory for TOS class designations was that, for a while, the term "class" didn't refer to a particular design of ship, but to its broader classification. Hence, the E-nil was listed on its dedication plaque as "starship class". This could be was class-S is; the 'S' could mean "Starship". Sometime in the 2260s, the system was changed, and "class" came to refer to the design of the ship, named for the first ship of that design. The term was probably also still used in other ways, such as referring to a starship as a class-S ship.
------------------
"All animals are equal, but some animals are more equal than others."
-George Orwell's Animal Farm
(I'm going to discount the mention of the D5 from the last Kor episode for a moment. I'll get to it in a minute.)
As far as D types go, we have a D5, D7, and D12, that I know of. First of all, these are not refered to as D class, but D type. The difference is subtle, but important. Type is defined as a general form common to some number of objects, while class is generally defined as a comprehensive grouping.
In terms of starships, class is what a group of ships actually is, like K't'inga class or D'deridex class, while type is what you call a group of ships whose class you are not aware of.
Before Khitomer, there wasn't much understanding between the Federation and the Klingon Empire. Because of this, Starfleet had to classify ships on their own. Hence, Klingon ships were grouped into D types. Later, after Khitomer, we see Klingon ships refered to by their proper class names. B'rel, K'vort, Vor'cha, etc.
The same thing happened with the Romulans. When the new warbirds first appeared, they were called B type warbirds. Once relations warmed a bit, at least to the point where spies could gather reliable information, the B type became the D'deridex class.
But what about that D5, you ask? Why didn't Kor call it by its Klingon name? Well, he wasn't exactly all there at the time...it's possible that he didn't even remember the Klingon name, just the Starfleet designation.
What do you think, sirs?
------------------
"I'm sick, like Nixon was sick, my defeated heart keeps beating on. I won't die, like Chucky won't die."
--
They Might Be Giants
------------------
What bloke invented signatures?
D-5: TAS battlecruiser, "The Time Trap," "Once More Into the Breach" (extended sensor/torp launcher in front, gray skin, etc.)
D-6: TOS battlecruiser, "Elaan of Troyius," et al. (unextended torp launcher, gray skin)
D-7: battlecruiser, "Trials and Tribble-ations" (unextended torp launcher, green skin, grid lines)
D-8: K't'inga battlecruiser, "ST: The Motion Picture" (unextended torp launcher, green skin, more grid lines)
D-9 through D-11: various birds of prey, B'Rel, K'Vort, etc.
D-12: failed bird of prey
D-13 through D-??: the modern ships
As to why the D-system is in place, in addition to the class names... who knows? Actually, no Klingons have ever used the class names... one might adapt the FASA reasoning and say that the D-system is the internal Klingon one but Feddies often also refer to ships by the first ship of that class... or not! =)
------------------
-=Ryan McReynolds=-
However, in "Once More..." I'm pretty sure that it was Kor who refered to his old ship as a D5.
------------------
"I'm sick, like Nixon was sick, my defeated heart keeps beating on. I won't die, like Chucky won't die."
--
They Might Be Giants
------------------
What bloke invented signatures?
------------------
"All animals are equal, but some animals are more equal than others."
-George Orwell's Animal Farm
------------------
I'm a doctor, not a bricklayer. (McCoy in "Devil in the Dark")
www.uni-siegen.de/~ihe/bs/startrek/
Oh, and as an off-and-on student of tlhIngan Hol, I can confirm that yes Klingons do indeed use a ten-digit number system.
------------------
-=Ryan McReynolds=-
Ryan: I'm looking for some possible Klingon ship names and their translations ("Bloody Dagger" or something like that). It should be official tlhIngan Hol.
------------------
What bloke invented signatures?