.

The vital parts like engines are not just protected against 12.7mm rounds but 23mm HE-F shells. They have two layers to protect each engine and one seperation/heat shield that seperates engine blocks from gearbox so one penetration or after effect such as fire does not screw up gearbox along with the engine. It is certainly not immune to projectile fire, but it isn’t particulary just against 12.7mm. There are angles it is barely protected but from most angles it is very well protect just like the wide seperated engines on Apache are pretty well protected.

To the later part yes and no. It isn’t as black and white as one might think. The Americans for Apache aswell russians use for their Hinds, Havocs, Gators/Sharks use outer skin the airframe itself made of aluminium alloy. It is thick at the cockpit and thins out at the avionics bay, cockpit withstands easily 12.7mm without cracks, the mid section is thinner, it can penetrate but it still provides most of the time protection since rounds usually come with flat trajectory, even tho Hinds have been penetrated some times, but not majority of the hundreds of rounds which could be seen on almost every Hind in Afghanistan. The tailboom section of all helicopters is always unprotected, for ballance and weight reasons. The only part that is protected is the tail rotor and tail rotor shaft by casing for 7.62mm maybe 12.7mm with good luck. The tail rotors themselfs are composite and can sustain penetration/non penetrations without shattering.

The A-129 has only cockpit section as one core armor layout while Apache and Havoc have 2-3 layers, the mid section is double walled aluminium alloy while A-129/EC-665 completley lose their Nomex cockpit armor at their mid section for simple thin single wall armor. This is also part of the reason why Tiger’s here in germany have been upgraded with ASGARD which provide ballistical shield for cockpits made of steel alloy rather than the thin GFK/Nomex.

Just look at the A-129 and how thin the armor is, a single door from Mi-28 is thicker than both sides of the cockpit of the Mangusta. The Mangusta is the worst because of its entire cockpit layout. A big concern the americans have had was crashworthiness since lot of engagements also malfunctions happened where the pilots could crash land and injuries on Cobras have been some times fatally which Apache improved significantly. The A-129 has almost no space beneath the Pilots seats, which greatly reduces structural weak points to be used to compensate for the high G-loads. Also much less space to fit armor or at least use some of the structure as armor.

It is a smaller object to be hit, but the armor content for high projectiles, which miliatries and dedicated SPAAG’s use to favor and only grow in recent years and near future will not be even capable to stop fragments of such rounds let alone direct hits. You are not wrong in the sense of surface that can be hit, but the results from different calibres are not in favor of A-129 nor Tiger.

Yes, from Military point of view, the problem however is enemy is not stupid to position their Anti Aircraft assets and perimeter protection without camoflauging, when they have this option they will use it.

You will never find a helicopter nor any other plattform that will all the time 100% accuracy see enemies before entering their detection and later their engagement range. Reality is cruel, if helicopter crews do not get sufficient intel from 2nd and 3rd eyes they are most likely to run into enemies and will only realize it after they have been under fire. It was always like that and it will not change that easily.

The heat output is also a myth by many. The Heat from Attack Helicopters under 20°C reach from 300-330°C. The lowest are for AH-2, Mi-28 and the lowest of all RAH-66 ..

Do you have any source for any of these?

Reduced ability to detect, tracking by radar, with super speed. This was demonstrated by MiG-25 vs SR-71, at now we have MiG-31 and SR-71

You mixed it up, faster targets are often much easier to detect and track because their return got bigger Doppler shift

F-15SE is just a mock up none was bought as far as i know
ATD-X is stealthy but just a technology demonstrator that not intended to go into service as a fighter
J-10D and Su-35S are similar ( basically Flanker airframe) both use some minor RCS reduction methods similar to HAVE GLASS I / II program for F-16, you cant really call them stealth either.

It seems me all so partial: what means narrow search mode?
How +/- degrees in both azimuth and elevation? Or it just means that they keep the antenna dish fixed forward?

In general cued search mode often mean the beam is narrower for more concentrated power, that will improve detection range but increase scanning time for total FoV.

Or at the contrary given that the Su-35 antenna can gimbal (main reason because Russians still have a crush for PESA) 😕

No, both PESA and AESA can steer their beam electronically, the mechanical steering thingy on Irbis-e is to improve it’s total FoV

And they just cite the Grave Stone radar for S-400? It is just a targeting radar, search functions are made by the 91N6E radar and there will be also Nebo-m above them.
.

search radar have wide resolution cell so they are not very suitable for targeting or missiles guide purpose

we’re already have cassegrain antenna with offset feed since 1960’s on some Russian radars.

Sapfir 23.

Iam quite sure the one in pictures is offset parabolic design rather than offset cassegrain type, there is no secondary reflector in front of the feed

Cause they didn’t do stripped down variants of either of those. The P-42 had so much avionics removed that its T:W was coming close to 2.

According to the website, the climb record was done by P-42, however the speed record was done by Su-27 (595)
which is this aircraft below, it dont have a radar and IRST or wing tip ECM pod but the rest of the aircraft is similar to a normal Su-27, it even have a TVC nozzle

http://estrellaroja-fotos.blogspot.com/2012/03/flankers-sukhoi-su-27-p.html?m=1

Because both, the sr-71 and mig-31 belong to other weight class, records are classified by weight groups.

Fair enough, but what do the record mean? for example the first record, does it mean the Su-27 maintained a average speed of 1718 km/h over the distance of 1000 km, do it includes take off, climb and landing? or does that mean the Su-27 accelerated to 1718 km/h then slowed down to optimum speed to finish 1000 km distance? what altitude was it crusing at? did the Su-27 used internal fuel only or did it have external fuel tank?, do you have any more details information about the record?

F-15E does not have EA-18G type version of with giant pods integerated aerodynamically into wings

F-15 have internal EW system

my statement is always accurate unlike yours..

given the history of you 2, i think your statement is quite ironic

http://www.boeing.com/defense/f-15-strike-eagle/#/technical-specifications

Are you aware that the 20 tons take off including fuel and weapons already ?, and what even make you think the 20 tonage is not include the radar ?