F-35 Joint Strike Fighter News, Videos and pics Thread


mig-31

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This is the reason why a very strong mathematical background required for any complicated engineering design.
This is the same case like in the Quantum chromodynamics and the Quantum electrodynamics .
The centre of gravity / lift can be calculated with the general knowledge of the shape, after this calculation the centre of gravity / lift will not move too much if you consider the exacts shape of edges, holes protrusions and so on.
With the interaction of the electromagnetic field with the body of the aircraft the mathematical method and model is different,
If you add a small detail to the model then the backscatter to the emitter will change not by the relative magnitude of the change, like in the case of centre of lift, but by the same magnitude like with the first calculation .
See ?
So , all simplified model will be useless for the design.
The main principles doesn't change whether the design is simple or complex. It is only that in complex design there is more calculation to be made so you require a computer. But that does not in any way mean the basics working principles of creeping wave and diffraction change.
If you add a small objects/detail with RCS of X to a model with a RCS of Y, the total value will not be equal X+Y, because we have to consider the effect of retro directive reflectors, as well as discontinuities, return. But that does not in any way mean the principles change.





Again, check the results of real life experiments.
This is a bit more complex than this simplified model.
It is the same with real life experiment. The main difference between a simple model and a full-scale airplane is the fact that a full scale airplane have many small details and panel gaps. So, generally speaking, there are more discontinuities and scattered locations. But main principles remain the same, return in Mie region is ALWAYS and I really mean ALWAYS frequency dependence. Because in Mie region the creeping wave return curve around the object and interfered with the specular return. The end result depend on whether this interference is constructive or destructive. Whether the interference is instructive or destructive depend on whether the creeping return and specular return are in phase or out of phase. That why the wavelength is important in this region.


The Russians did a deep and expensive work with the robot applied lamination of the air intakes and so on.
So , two possible motivation :
1. Russians are stupid, and did a pointless work
2. The X band backscatter satisfy the military requirements.
Considering that the Russians has no issue to refuse the delivery of a military hardware it the performance of it doesn't hit the requirements (it is the opposite of the USA practice) we have to consider that maybe the explanation #2 is true.
Of course it gives only frontal low observation characteristic, and it can be slightly bigger in X band than the F-35, but the Su-34 has to penetrate a patriot battery, not an S-300, and even a flying pig with a lipstick can do that : P
Just because an aircraft has RAM applied on it doesn't mean it will have low RCS or will become a low observable aircraft. US also applied Iron ball RAM on F-15, but that doesn't mean F-15 will suddenly have the same RCS as F-16, let alone something on F-35 level. Reducing RCS has other benefits apart from making your aircraft hard to detect, putting RAM on your aircraft can help reduce its return and making jamming more efficient. This is the case for F-15 and Su-34. They are not stealthy in any way, shape, or form. Su-34's X-band scatter is not slightly bigger than F-35, unless we consider a dozen thousands times bigger is slight. At most, Su-34 is the same as F-15 with iron ball RAM. Hoping that it can reach the level of dedicated stealth aircraft is simply wishful thinking with no basis on reality. FYI, US does refuse military hardware when their performance doesn't reach important requirements, just look at how many program they canceled.
 

Air Force Brat

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Super Moderator
The main principles doesn't change whether the design is simple or complex. It is only that in complex design there is more calculation to be made so you require a computer. But that does not in any way mean the basics working principles of creeping wave and diffraction change.
If you add a small objects/detail with RCS of X to a model with a RCS of Y, the total value will not be equal X+Y, because we have to consider the effect of retro directive reflectors, as well as discontinuities, return. But that does not in any way mean the principles change.






It is the same with real life experiment. The main difference between a simple model and a full-scale airplane is the fact that a full scale airplane have many small details and panel gaps. So, generally speaking, there are more discontinuities and scattered locations. But main principles remain the same, return in Mie region is ALWAYS and I really mean ALWAYS frequency dependence. Because in Mie region the creeping wave return curve around the object and interfered with the specular return. The end result depend on whether this interference is constructive or destructive. Whether the interference is instructive or destructive depend on whether the creeping return and specular return are in phase or out of phase. That why the wavelength is important in this region.



Just because an aircraft has RAM applied on it doesn't mean it will have low RCS or will become a low observable aircraft. US also applied Iron ball RAM on F-15, but that doesn't mean F-15 will suddenly have the same RCS as F-16, let alone something on F-35 level. Reducing RCS has other benefits apart from making your aircraft hard to detect, putting RAM on your aircraft can help reduce its return and making jamming more efficient. This is the case for F-15 and Su-34. They are not stealthy in any way, shape, or form. Su-34's X-band scatter is not slightly bigger than F-35, unless we consider a dozen thousands times bigger is slight. At most, Su-34 is the same as F-15 with iron ball RAM. Hoping that it can reach the level of dedicated stealth aircraft is simply wishful thinking with no basis on reality. FYI, US does refuse military hardware when their performance doesn't reach important requirements, just look at how many program they canceled.
Yep!, but don't think our friend anlsv is gonna catch any of this??? doesn't fit his world view as outlined by Terran?? LOL another sad case of "head up and locked" here on SDF???
 

mig-31

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F-35 Joint Strike Fighter News, Videos and pics Thread
? LOL
Ah because SPEAR-EW will be used by UK F-35, so I think it is relevant
MBDA working on new SPEAR-EW electronic warfare weapon
11 Sep 2019 MBDA PR

"MBDA has been awarded a contract to demonstrate SPEAR-EW, a new electronic warfare version of the SPEAR weapon system family on order for the Royal Air Force (RAF).

SPEAR-EW is being developed by MBDA in partnership with Leonardo to complete a wide range of Suppression of Enemy Air Defence (SEAD) missions, under a Technical Demonstration Programme (TDP) contract awarded by Defence Equipment & Support (DE&S). SPEAR-EW will integrate a cutting-edge miniaturised EW payload from Leonardo, which will act as a stand-in jammer to greatly increase the survivability of RAF aircraft and suppress enemy air defences, acting as a significant force multiplier.

Defence Minister Anne-Marie Trevelyan said: “These state-of-the-art electronic jammers will confuse our adversaries and keep our pilots safer than ever in the air. Paired with the devastating power of precision Brimstone and Meteor missiles, our world-class F-35 and Typhoon jets will continue to rule the skies in the years to come.”

Mike Mew, MBDA UK Director of Sales and Business Development, said: “SPEAR-EW is a revolutionary new capability that, alongside the existing SPEAR3 weapon, marks a fundamental change in the ability of friendly air forces to conduct their missions despite the presence of enemy air defences. Our vision for SPEAR is to create a swarm of networked weapons able to saturate and neutralise the most sophisticated air defences. Adding SPEAR-EW to the family alongside our existing SPEAR strike missile demonstrates the principle of introducing complementary variants to the SPEAR family that will add significant capability and force multiplication without the need to repeat the platform integration. We have an exciting roadmap of variants, spirals and technology insertions in the pipeline to further enhance the family as we move forward.”

The core of SPEAR-EW’s payload is Leonardo’s advanced, miniaturised Digital Radio Frequency Memory (DRFM) technology, which offers the most advanced and future-proof electronic jamming and deception available on the market today.

The new SPEAR-EW will complement the SPEAR network enabled miniature cruise missile, which is designed to precisely engage long range, mobile, fleeting and re-locatable targets in all weathers, day or night, in the presence of countermeasures, obscurants and camouflage, while ensuring a safe stand-off range between the aircraft and enemy air defences. Powered by a turbojet engine the SPEAR missile offers over double the range, and a far more flexible operating envelope, when compared to a conventional glide weapon. SPEAR-EW utilises this long endurance through its capacity to be launched at enhanced stand-off ranges and loiter while carrying out its jamming mission.

The compact size of the SPEAR family allows four weapons to be carried internally in each of the two internal weapons bay of the F-35, or three per station on the Eurofighter Typhoon. SPEAR-EW will keep the same form and fit as the baseline SPEAR to enable a single integration pathway and launcher solution.

SPEAR family complements MBDA’s wider portfolio of strike weapons, filling the gap between the large and very-long range Storm Shadow deep strike missile and the highly accurate Brimstone close-air-support missile...."
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