This is a "spawn", not a "launch" of a plane. ie: Each AI vessel has an "AirGroup" with a set number of planes, and the ship is re-classified basically as a "Carrier", as can be seen by the re-naming of the Type=18 vessel Group to "Light Warship with Scout Planes" and the Type=19 Group into "Heavy Warship with Scout Planes". The AI submarines are now Type=17. In "Stock" trim, the Type=17 is an 'Elite Destroyer Escort', and that "behavior" translates now to the AI submarine taking on the "Attack!" tactic of a DE vessel, instead of the "Avoid!" tactic. Likewise, the Type=18 in Stock was 'Elite Escort Carrier' and the Type=19 was 'Super Fleet Carrier'. Therefore, these Warships now take on the "Attack!" behavior of said vessels (CV launch airplanes). You can count on an active air response from them when your submarine (or any other 'enemy') is detected. Airplanes will "spawn" as appropriate for the groups, which does include four of the IJN AI submarines... You will NOT "see" airplanes 'launch' from the catapults (yet), and if you are in too close (within the "spawn" radius) to the vessel, they will not generate a detectable, immediate air response. ~BUT~... it seems that if you go below "communication" depth, which is somewhere below periscope depth, but above crush depth, planes ~seem~ to spawn, but I cannot confirm this behavior...
In other words, you need to change your Takao into a Type=19 vessel with its "Type=" line in both of its CFG files. You also need to add an appropriate "AirGroup" to its Sea folder CFG file. You can copy the 'pattern' from a carrier, only you'd just have a few float planes in one group... Then the ~fun~ part (at least for me) is to change ~all~ the campaign files to match your new "calls" for the Takao. But, I don't think the technique would work for a player-controlled vessel... We are currently once again trying to find that "balance point" with this in FotRSU. This is our 2nd attempt at this, with the first try being too "light"... CapnScurvy may have a further / more-detailed response...
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