Continuing with errors (from F6 and civilopedia of the same hotseat game):
- Chinese have both Early Fighters and I-16 availible, while they use only I-16.
- Arabs naven't Humvees nor any of their flavors.
Belofon, thank you very much for reporting these two errors and your additional input about RARR.
Battleships go obsolete with Nuclear Power rather than Naval Aviation, since they upgrade to Carriers rather than WW2 Carriers (I hope this is correct, but in this case you should fix Civilopedia description).
Battleship become obsolete when the tech Naval Aviation is researched and the player has the needed resources to build aircraft carriers. This means they cannot been built any longer,
but they don´t upgrade to carriers. This is written in the textbox of civilopedia battleship entries (see the screenshot below). The obsolescence of the battleship is created by setting the unit in the editor to be allowed to upgrade to a certain different unit, but also to set the unit to be not upgradeable. Unfortunately the game adds an additional wrong hardcoded entry for the player, that the battleship can be upgraded to a carrier and this additional hardcoded entry cannot be avoided with the settings above.
Civilopedia entry for a battleship in RARR (Not-player-civ):
Here a screenshot of a battleship of the player´s civ (taken out from my mod CCM2 -but in RARR it´s the same problem):
(May be not an error) Complete mess with destroyers. Under some reasons, corvettes and privateers upgrade to destroyers rather than WW1 destroyers and destroyers upgrade to missile destroyers rather than modern destroyers. Also, why Frigates upgrade to Destroyers (normal or WW1, I don't remember) while weaker War Galleons upgrade to Heavy Frigates (which leads to Cruisers)? Continuing this topic, it would be logical to make Iron Frigates upgradable to Predrednoughts (because iron frigate-like ships were the first step of ironclad evolution and predreadnoughts were the second).
This is a complicated chapter, that will not be solved with the next version of the RARR biq (may be with the exception, that the ships of the line will be pushed back from era 3 to era 2, as it was with DyP and as I described it some posts above).
RARR introduced some new lines of warships, as there are a lot of outstanding new units, created since the time of RAR and DyP. These ships should have 'a place on the map' and not become upgraded to the next unit when they are constructed. RARR has no limitations in time to research the next tech, even 1 turn researches are possible. This problem becomes worse with playing in the eras 3 and 4, so it can frequently happen that these ships will not appear in the game, because when they are constructed, the next unit can be built. This is one of the reasons, why the upgrades mostly are timed to the generation of ships that come after the next generation. In real life also not all conventional destroyers did dissapear, when the first destroyers armed with missiles did arrive. It´s especially the number of older ships that can only be upgraded to a certain type of unit, that assures, that the present generation of ships has a chance, to be present on the map.
The other reason is the strategy of many players, that they don´t like to send their ships across the seas, when the ships can be upgraded in a nearby harbour in the next turn (or the turn after).
But here a lot still must be done. The battleships will be set from era 3 to era 4 to give the iron frigates (ironclades) and dreadnoughts more room to become active in the game. At present the distance in research (techs) between iron frigates and predreadnoughts is very small.