Just trying to think how that works because dipping sonars are normally lowered by helicopters, and active sonars are normally in the bow of a ship. A towed array is normally in the stern and looks a bit like a long large wire with microphones in.
So why is a towable sonar being lowered from the middle?
Completely off Sonar topic, but anyone else noticed that they gave depth charges and mortars explosion models? Before once deployed it was just a red indicator that went in the water with nothing following on, now it actually desturbs the water surface much like a actual explosion.
Since it 's a dipping sonar, my assumption( supported by no sources ) is that it 's not intended to be lowered while the vessel is in motion.
The hydrofoil being as fast as it is would probably allow it to move to the general area of a suspected submarine contact much faster than a submarine could leave, then direct a more substantially armed, but slower or less sensor-equipped large ASW vessel to make an attack.
Though it still has guns for self-defence against similarly-sized ships or aircraft, and the acoustic torpedoes for if a discovered submarine is close enough for them.
Guess that makes sense if you want to listen below the thermocline although I can see why it didn’t catch on. If you detect a submarine, you probably don’t want to be a sitting duck waiting to reel your sonar back in
I’d see Dutch subs starting at the K XI class, then the O 19 class, then Dolfijn. Something like in a Dutch subtree. I did actually do a thought exercise like thing and worked out reasonably full sub trees for the UK, USSR, US, and Germany