[Mustang]

Modern tank gun HEAT round is generally defined with a capability of 60 (=600mm) or more; modern 'conventional' 120mm mortars, like EFSS, IMI, etc. have no HEAT but a AP Pen of 21. All these shells are 'single' ones; no bomblets at all. But the AMOS e Nona gun-mortar types, having also AP ammos, are granted with CM with, respectively, a 21cm (AP) or 60 cm (HEAT) capability !!! (go to point c)

AFAIK, the way the game is coded, all AP rounds given to artillery represent cluster rounds. If they have an AP pen but no cluster rounds that just means they aren't issued any AP rounds.

b) they don't damage modern tanks, but only harass / damage them : in my tests, with heavy MLR bombardment vs modern tank formations, I never had a real-complete kill; in the best cases the suppressed crews left the vehicle and/or the vehicle itself was immobilized.

I've seen rockets and howitzers kill tanks, it's just rare because they don't cover the wide surface area that cluster munitions do.

c) why an AP pen, for submunitions, with so a high value : a 155mm sub-muni with about three times the capability of a EFSS, IMI mortar single round and equal to the standard 120mm HEAT ? It's obvious that with this value (vs the top armor), no tanks could have a chance to survive, if hit.

Good point but I think it's irrelevant in practice because real life cluster munitions can penetrate any tank's top armor anyway.

- HEAT for the RUS gun-mortars like Nona : AP Pen value = 25; HEAT value = 60 (???)

AFAIK the HEAT rounds are only useful in direct-fire. You can't plot indirect fire missions that use HEAT. 60 PEN is similar to some of the better RPGs.

and so the ERAs have effects only vs the Nona / 2A65 CMs; no defense in the case of the AMOS & M284/FH155 ecc.. Why ? One of the russian T-72/80/90s atout is just the ERA's top armour protection. In this way, the CM capability seems to be modeled as the ultimate T-xx killer.

I thought indirect fire never uses HEAT rounds. Only the HE and AP pens matter for fire missions. But then again I haven't checked.

IMHO, the AT capability of the 120/152/155mm CM sub-muni seem to be over-estimated, by about a 10 factor (60cm vs probably a 5-7cm in real world, in the DPICM cases), with heavy consequences on the simulation mechanics and on the game play, and - in the case of western guns - thet are treated as AP and no HEAT, without any defence chance by modern ERA. In the case of the gun-mortars, if the AP/HEAT simulates the single-shell, it would be necessary to avoid the CM effect.

Even if cluster munitions can't penetrate armor, and I'm pretty sure they can in real life, they can knock out optics and send shrapnel into any air filter or viewport on the vehicle, totally wrecking the interior. Any tank would be trashed under a cluster barrage. The problem is the Russian weapons not being powerful enough. Just my humble $0.02.