Doesn't the navy already use 25mm AB for the Sea Zenith ?
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Why would they have issues with 35mm AB ?
Sea zenith uses AP rounds (HEI, i don't really differ the terminology), That is why Navy asked for HEI (APDS) whichever first the armor piercing role.
Navy didn't ask for HEI shells for an air defense role he is wrong again. Navy asked Phalanx like CIWS(Full metal jacket) to complement the Gokdeniz system. Gokdeniz system has some flaws for very short-range very high angle of attack engagements. Even though it became lighter and more maneuverable Gokdeniz is still a clunky system. You have limits with 2 big 35mm cannons. The Navy asked HEI shells to engage sea surface targets mostly small boats. Incendiary rounds are very good against surface targets.
Navy did ask for HEI shells for aerial targets, for god's sake stop pretending like an insider making claims as if you have seen it by your eyes. HEI was asked particularly for hard-shell aerial targets as a secondary option, there is a main cannon with 76mm for surface targets, and 2 x 25mm STOP on platforms Gökdeniz is going to be installed.
Also, both airbust ammunition and HEI rounds can be used against surface targets, Gökdeniz is complementing main cannon because, probably we don't have a 76mm air burst ammunition as of now.
. Navy asked Phalanx like CIWS(Full metal jacket) to complement the Gokdeniz system. Gokdeniz system has some flaws for very short-range very high angle of attack engagements
Be honest and tell, i have said a few messages ago:
ATOM doesn't have a C-RAM variant as you have claimed (as effective as 20-25 mm single core rounds),ATOM itself is already capably of C-RAM partially, but not as effective as phalanx based C-RAM and navy particularly asked for gatling based CIWS for a true C-RAM (against hard shell targets) by foreseeing the growing application of smart munitions like Vulcano.
It is an interim solution, the ultimate solution, which is aimed, will be smart-guided munitions like DARDO and probably will be based on 76 mm.
You have disproved yourself, nice. Gökdeniz doesn't have flaws you have mentioned, i suggest you to stop making "claims" as if it is real, if it is your opinion then tell it is your opinion, opinions are respected. Gökdeniz can engage high elevations and it is slightly bulkier (yes because of 2x 35mm compared to Millennium gun with 1x40mm), it have flaws from the ATOM round (if used in fused mode) and rate of fire (1100 vs 4500), it is not effective against hard shell targets,as much as phalanx is (which i have told a few messages ago why ATOM C-RAM wouldn't work,and doesn't exists anymore), and less responsive than Phalanx* (But wait if you were an insider as you have pretended, you would also know about the newer iteration of Gökdeniz)
*Why it is less responsive? Phalanx has vertical architecture, feed from bottom, control radar on top, has quite little inertia compared to Gökdeniz, which feeds from sides and has a horizontal architecture.
Phalanx has one major flaw too: Range, its effective range is less than half of gökdeniz ,it disperse much more rounds per-target (however the latest upgrade has electonic control for this to control amount of rounds per target, per engagement)
Gökdeniz's flaw is not entirely about the platform itself but ATOM round, if there was a C-RAM variant as you have claimed (as much as effective single-core bullets of Phalanx CIWS), then there wouldn't be a need for Gatling gun based CIWS compromising effective range which matters the most in case of hypersonic threats.
You should listen more before making baseless claims.
You are making baseless claims, not me. I am telling that brochure isn't even coming first in search anymore, first shown 5-6 years ago(or even more) when ATOM round development has first started.