[OKO]

Very interesting post about KILO's sonars, thanks guys !

The Kilo's passive sonar was never very good (small, cylindrical...) - my question would be whether it is appropriate for a KILO to detect another (presumably slow moving) Kilo at 12 miles.

I'm not so sure about detecting a kilo at 12nm.

It must have had a diesel on or been cavitating, that's the only way I see that happening to be honest

well, actually, I based a scenario on this (didn't already made the briefing ...).
One XIA is escorted by a HAN and 2 chinese KLUB KILO (so ... improved hull).
2 Russian KILOs (standard, the louder one) have to sink the HAN before he reach a datum.
The chineses improved mission is to help the HAN to reach the datum, by frightening or killing the 2 russian KILOs.

On this mission, you must hold weapon until you receive the weapon free message for your side.
You receive the weapon free when :

1) any chinese KILO detect a russian KILO

2) any russian KILO detect the XIA or the HAN : not only the XIA to make some confusion at ID the right target, because the goal is to sink the XIA, and sinking the HAN won't give any credits on mission briefing.

3) the other side has already receive the weapon free 6 minutes ago.

For 1) et 2), you will receive a weapon free only 6 minutes after assigning a tracker on the target : this is to confuse a bit the players, to avoid they immediatly know the just assigned tracker is the target.
and 3) is to give a weapon free on both side, even if one side didn't detected an enemy target.

And on this mission, it's not always the HAN (the louder ship) who is detected first !
it's 50/50 the HAN or a russian KILO who is first detected.
I had detection until 15 miles (on manned KILO at 12 knts max, not cavitating), with the help of CZ, I need to mention it.

But on this mission, you will always be able to find the russian KILO with chinese KLUB passive sonars (conformal of course) at some times during the mission, when you won't be able at all to see any chinese KLUB on the russian KILO passive sonars.
Best detection time is 6 minutes after mission start (but certainly du to a specific convergence, and happen only once in ~6 MP games, usual detection time is 20 to 40 minutes).

try the mission in both side (every plateform is scripted to play this solo also), you could see what I mean =>
http://okof4.free.fr/missions/DW/MP4..._slick_b1.0.mu


speed and depth of subs are randomly generated (4 possible speed and 3 possible and specific depth for HAN and XIA, so you must search at every depth).

Here you will see it can be possible to make distant detection ( ... say medium range detection) on a standard KILO with a KILO sonar.
The mission is based on this, indeed

As I said in my first post, this is not bad at all for gameplay, on the opposite it's fine.
My question was : Is it realistic to have such a gap beetween these 2 versions.

You convince me it is, gents.

Also hope to play this one with you soon, very funny match in MP !
Even in solo it's quite a hard fight.