[Amizaur]

Just launched a mission just to confirm that the whole thing works - for Bellman. I would consider reinstalling DW, if you don't have original database and doctrines folders backed up, to restore original state.

UUV launches, changes depth and speed as advertised :-) But I'm little worried about sensor performace. First, it detects targets that are behind it !!! Has it omnidirectional sonar assigned ?? Have to look into db to check.
Second, it detected Ametyste class at 7kts from... 20nm :-/. It's not particulary quiet sub, but not a November after all. Also detects civilian ships from long way. :hmm: :hmm: :hmm:

Let me look into db... I see, almost omnidirectional (300deg) sensor... are we expecting such device in a UUV ? :hmm:

But the second thing is, that it's a LF, well, in fact VLF sonar !!! From ZERO to 1200Hz. Jesus, that's a towed array parameters !!! It has better frequency coverage than a large sub sphere sonar :-/.

It's tiny, it - just like torpedo seekers - should work in medium and high frequencies. What's the difference ? Limited detection range. And realistic performance... This was one of things I wanted to do for torpedo seekers, re-tune them to high frequency, it's also much easier det range controlling. But there is plenty of torpedo seekers, quite a work, and only one UUV seeker, and quite important one, so I think this should be done for it.

Please, anyone who knows, tell at what frequency range a modern passive torpedo seeker works. Or it can be estimated based on receiver physical dimensions IIRC ? Hm UUV sonar would have about 0.5m diameter. That equal to sound wave length at about 3000Hz.

On the other hand, 688I sphere sonar have set good sensivity limit at 800Hz (because I'm pretty sure it can receive even 50-100Hz sound, just with very poor sensivity). What it's physical size ? about half of sub hull diameter ? About 5m ? Then it's ten times larger than the UUV seeker (0.5m). Then corresponding good-sensivity limit for UUV seeker would be 8000Hz !!

Now, while working in VLF range, the UUV sensor when set to sensivity at which it can detect quiet contact at close or very close range, it will also detect a moderate or loud target at 10-20nm if not longer - just like towed array does ! HF passive sonar range would be less dependant on target noise level, or to say it another way, it would be range-limited - even very loud contacts unlikely to be detected outside effective range. High frequencies have much higher signall loss with range than LF, high frequency absorbtion, we all know this. That's why sphere sonars are limited in range. And UUV sonar is MUCH smaller than 688I sphere sonar !!

Of course same thing should be made to torpedo seekers, and I planned that, but it was much less important there, because torpedo seekers where hard range-limited by detection curves, so exccessive det ranges of loud targets was not a problem. When (and you say you are planning this) hard limits are being removed from torpedo passive seekers, this is a must too. It simply can't be achieved proper characteristics with curent 0-1200Hz freq range. When very quiet targets detected from 100yd, noisy civilian would be detected from 20nm or so... by a torpedo seeker. At 40kts.

I think you should take DWAnalyzer and compare 0-1200Hz seeker range characteristics with something like 3000-15000Hz seeker. By DWAnalyzer it's much faster and also much easier to understand the difference than in gameplay tests.

I think it's ABSOLUTELY unlikely than UUV passive sensor has better range against loud contacts than sub mounted Sphere or cylindrical sonar. If it was so, such sonars would be mounted on subs :-). And don't say me about OS self-noise, Kilo at stop doesn't produce more self noise than UUV at 4kts... If my sphere sonar didn't detect this 7kts Amethyste at 20nm, there is absolutely now way that tiny UUV sonar could here it.

BTW, single-sensor sonobuoys (are they such, or they are all line arrays like VLAD ?) should have no LF capabilities too. BUT then we couldn't use them to target identification, as there would be no frequency lines in low freq range... so they have to be LF in game. Unfortunately, the sensor sensivity in DW is same for all frequencies... maybe a solution would be give such object few sensors, covering different frequency bands, but with different sensivity ? I wonder if giving it's possible to give DIFAR a two or three passive sensors covering different frequency bands with different sensivity, and would this work ok with GRAM display ?? Can't remember now how are sensor/display connected in DW, can there be only one sensor assigned to a display ? I think this would work for AI sonobuoys (LOFAR?).

P.S. Oh yes, helo dipping sonar. First, I'm under impression that it's a davice few times larger than a torpedo seeker. Second - don't look at it's in-game characteristics. It HAVE TO be VLF capable, to allow players ident targets by frequency lines. But I'm quite sure, that in RL it's sensivity in this range is much lower than at medium frequencies. But in game you can set only one sensivity value for the whole range, so reducing it to give realistic results at VLF, would make it too deaf in higher freq. Again, I wonder if it's possible to assign two seekers to dipping sonar display :hmm:

To summarise:

- speed and depth changes works wery well, no problems. Also can't see how JSGME could NOT uninstall the mod, or uninstall it partially (??), most probably messed game installation...

- please change UUV passive sensor form VLF to HF passive sonar. We don't need to see low frequency lines from it, it has no display, it's an AI sensor in fact, so we CAN make it realistic in terms of frequency coverage and det ranges

- are you sure the UUV should have 300deg sensor cone ? Greater than torpedo, sure, but 300deg ? Maybe 180deg ?

- I would vote for UUV to have max speed 10-12kts. If not, and you insisted in 20kts max speed, then range at this speed should be MUCH shorter - even more than for torpedos. It's propulsion is probably optimised for long endurance at low speeds, and even if it was capable of 20kts (maybe it has smaller (but quieter) electric motor ?) it would strain the battery very much. 32km at 4kts, then 10km at 20kts. But better 10-12kts max speed with some range penalty. Maybe 32km at 10kts and more at 4kts ? On the other hand practical range at low speed would be probably only wire-limited. On the third hand ;-) the "wire" is probably a thin glass optical wire, not a copper wire, and in device of such size you can easily store 50NM of such wire ! There are even much smaller missiles with wire optical guidance (Polyphem to name one) with plenty of wire.