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  • in reply to: 2017 F-35 news and discussion thread #2142222
    mig-31bm
    Participant

    F-35 were not there during first week of Atlantic trident

    So what? The article is about BVR combat.

    The first week focused on basic fighter maneuvers, the second on defensive counter air operations, and the third on offensive counter air.

    Though, i do agree that according to earlier article, we were told that in offensive counter air, Red air were F- 15E, E-3 and T-38. Still it worth waiting a few days for confirmation/denial from more reputable sources like aviationweek.

    in reply to: 2017 F-35 news and discussion thread #2142269
    mig-31bm
    Participant

    https://patratora.gr/archives/213112
    English translation:

    “Wildwood” in Rafale, Eurofighter and F-15E from the F-35 in epic jockeys in the “Atlantic Trident”![/size]
    October 8, 2017 WORLD , NEWS

    The F-35A’s overwhelming superiority was recorded in some of the most epic avant-garde fights in NATO history when the USAF fighter met for the Atlantic Trident (April 12-18), French Rafale fighters and British Eurofighter Typhoon , some results from which they began to leak.

    The F-22 fighters of the USAF also participated in the exercise.

    The score was overwhelmingly in favor of US fighters, of course the 5th generation, but the issue for the Greek side is not how the European fighters behaved against the F-22, but against the F-35, as in six months “tired” Mirage 2000 and F-16 third generation, PA will have to face the Turkish F-35A.

    Rafale and Eurofighter were fired by AIM-120 long before they realized there was an enemy in the shooting position.

    The AP-81, the F-35 radar tracking track at distances over 230 km of locking at distances of over 150 km and firing at the firing limit of AIM-120 with the Anglo-English fighters, literally did not know “from which came “!

    They never reached distances of less than 30 km and when all the English-style fighters did it, they were destroyed!

    All of this from an aircraft that was not designed as an airborne aircraft against aircraft designed as airborne aircraft (let’s say Airflight was emphasized in Rafale), but it has now shown that the 4th of the 5th generation separates it real chaos, as it is not just the stealth features, it is also the electronic systems that give the overwhelming avant-garde.

    It was impressed that neither Eurofighter’s IRST system was useful, as the F-35’s shots were out of range.

    In the exercises F-15E fighters took part with the enemy forces and they had the same luck.

    The question then is how do some people in Greece consider spending an enormous amount (1 billion initially and up to 3 billion dollars later) to upgrade old F-16s that, because they will acquire AESA radar, will be able to articulate “Dissuasive” reason against the hordes of the Turkish F-35!

    When the senior Rafale and Eurofighter are presumed to “eat wildwood” from the USAF fighters, which even – and this has its significance – do not even have a complete flight envelope, as it is believed that the fighter is still evolving!

    in reply to: 2017 F-35 news and discussion thread #2143118
    mig-31bm
    Participant

    F-35’s performance at the 2017 Huntington Beach Air Show:

    http://www.f-16.net/forum/download/file.php?id=25494&t=1

    in reply to: AESA Radar range calculator. #2143276
    mig-31bm
    Participant

    Yes, my formulas automatically assume that it’s a half wavelength spacing. If there is any less like in the image, the only explanation would be that the array isn’t exactly 1250 Mhz but rather lower wavelength. It could operate in 1250 Mhz but with limited scanning angle. Otherwise it might not be in L-band at all but something higher maybe S or C band.
    can use the same way as how E-2 determine altitude via multipath heightfinding

    Judge by the elements spacing, i think the radar probably operate at 2.5Ghz. Btw, can you elaborate multipath heightfinding?

    in reply to: AESA Radar range calculator. #2143468
    mig-31bm
    Participant

    https://forum.keypublishing.com/attachment.php?attachmentid=255953&d=1438210247
    Linear array beamwidth is basically 2/N Thus for array of 24 elements it is 2/24=0.08 Radian or 4.7 degrees

    Does that formula take into account elements spacing?. Elements seem very close together, your example wavelength is 24 cm, 24/2= 12, i doubt that woman wrist can be 12 cm wide. Even 6 cm wide wrist seem very rare

    in reply to: High-threat environments – Helos vs FJ #2144037
    mig-31bm
    Participant

    Good content.

    in reply to: 2017 F-35 news and discussion thread #2146540
    mig-31bm
    Participant

    Items of note:
    — 21:50 – 6 x 2k JDAMS + (int) AMRAAMS + 9x going mach 1+

    Why there isn’t any afterburner flow?
    https://s26.postimg.org/8254scd21/Screenshot_20170911-211354.png

    in reply to: AESA Radar range calculator. #2147663
    mig-31bm
    Participant

    I want to estimate air to air range of radars like APG-77 and APG-81

    I gave it a shot:
    APG-81:
    T/R modules: 1626
    Peak power per module: 10W
    Operational wavelength: 3 cm
    Aperture weighting: Taylor40D
    Radar PRF: 10 Khz, Pulse width: 20 micro sec => Duty cycle: 20 %
    Scan time frame: 9 seconds for full search volume.
    Scan volume: 20° azimuth, 10° elevation (Cued search => longer dwell time => longer range)
    Against target with RCS = 3m2
    Maximum detection range with 50% probably of detection = 391 km
    Maximum detection range with 90% probably of detection = 242 km
    http://www.f-16.net/forum/download/file.php?id=25351&mode=view

    in reply to: 2017 F-35 news and discussion thread #2152769
    mig-31bm
    Participant

    .
    As often seem to happen, you were making petty technical remark

    Why is it petty if it true?

    See, in my country we use to call such kind of sponsored documents “marchette” i.e. the way that was used to pay for the girls’ services in old times’ brothels.

    So the remarks I have made about the figure you reported were intended just as practical examples of how some data can easily be twisted and sugarcoated in order to fit the sponsor’s agenda. Rest assured that if instead of the Northrop-Grumman there have been some IRST producer to pay the bill there would have been completely diferen considerations.
    The fact you replied in the way you have done just confirm me that, sadly, you have eat not just the bait but also the hook, the angle and the whole fishing pole.

    You do know system like DAS MS-177 were designed and produced by Northrop Grumman right?
    LM themselves also produce Tiger eyes, Legion pod, EOTS, Sniper-XR.

    in reply to: 2017 F-35 news and discussion thread #2152895
    mig-31bm
    Participant

    I’m sorry, where does F-35A’s 3,760 km range come from? LM themselves said the range of the F-35A is 2,780 km.

    I don’t know where 3760 km come from but i recall they gave AA combat radius of around 760 nm, so if we convert that to range we have like 2800 km

    Also, isn’t the subsonic range of the PAK FA supposed to be 3,500 km? Where did 4,300 km ever come from?

    3500 km is Su-27 range, i think

    in reply to: 2017 F-35 news and discussion thread #2152896
    mig-31bm
    Participant

    Now, according to this absolutely indipendent and interest free istitution report, all others except the mighty americans are just wasting money and time in the vain effort of match the superior intelligence, wisdom and cool look of the homo nordamericus…is ‘nt it?
    Repent you fools and bow!

    Iam about 99.999%sure that America isn’t the only country that followed that stealth game.

    Just look how in the published figure they have very convenientely dropped out the conventional scanning radar range published in figure 3 (from which you can get that the IRST and the radar range of the Typhoon are actually the more or less the same),

    Conventional mechanical radar are relatively old technology for fighter aircraft. Newest versions of Sukhoi, F-16, F-15, F-18, F-22, F-35, Gripen, Rafale.. etc all have electronic scanned array. Because Pirate is a very new IRST, so it make sense to compare it to young generation of radar such as AESA, PESA radar. If you want to compare with slotted array then i think IRST like the on old Mig-29 will make more sense

    add also how in the case of the IRST they have published both the front and rear aspect when in the case of the radars not only they don’t differentiate them but neither note what the one published there are (degradation of radar performance according to the aspect is even greater than this but it work in the opposite way, so in case of a rear aspect engagement IRST wins hand down).

    100 miles is around 160 km, that is very short range for a radar, i would guess that the tracking range again small air target.
    Anyway, radar degradation due to aspect isn’t as big as IRST one, because radar range is affected by Doppler shift and side lobes clutter. Doppler shift can be very high still if speed different is big, side lobes clutters can be reduced by shielding to reduce leaking of radar lobes. By contrast, IRST will always have smaller range head on because aerodynamic heating are much colder than engine nozzle or exhaust

    in reply to: 2017 F-35 news and discussion thread #2153134
    mig-31bm
    Participant

    SURVIVABILITY IN THE DIGITAL AGE STEALTH: The Imperative for Stealth
    https://s3.postimg.org/9d6q3mupv/IRST.png

    http://docs.wixstatic.com/ugd/a2dd91_cd5494417b644d1fa7d7aacb9295324d.pdf

    in reply to: 2017 F-35 news and discussion thread #2167255
    mig-31bm
    Participant

    A Closer Look at Stealth, Part 5: Nozzles and Exhausts
    F135 Engine
    http://www.f-16.net/forum/download/file.php?id=24963&mode=view
    In designing the nozzle of the F135 engine that powers the F-35 Joint Strike Fighter, Pratt & Whitney aimed to rival the low signature of the nozzles on its previous F119, while beating it on maintenance costs. The F135 nozzle comprises two overlapping sets of 15 flaps, offset so outer flaps are centered on the gaps between the inner flaps. The inner flaps are thin, have metallic exteriors and straight sides and terminate in inverted “V”s. The sides create rectangular gaps between them with the nozzle fully diverged. The outer flaps, which Pratt calls “tail feathers,” are thicker and covered in tiles with blended facets. They terminate in chevrons that overlap the ends of the inner flaps to create a sawtooth edge. Toward the fuselage, the tiles end in four chevrons and are covered by additional tiles (not attached to the engines in this photo) that terminate fore and aft in chevrons and interlock with adjacent tiles in sawtooth-fashion.

    The F135 nozzle likely suppresses IR signature using multiple methods. The trailing-edge chevrons create shed vortices, shortening the plume, while their steeper axial angle likely directs cooler ambient air into the exhaust flowpath. The inner surfaces of both sets of flaps are white and covered in minute holes similar to those on the F119, which might supply cooling air. The space between the tail feathers and the trailing chevrons may also contain ejectors to provide even more cooling air. The tiles and inner flap surfaces are likely composed of low-emissivity, RAM composites.”

    http://aviationweek.com/defense/closer-look-stealth-part-5-nozzles-and-exhausts#slide-3-field_images-1655211
    P/S:
    Bypass ratio and infrared
    https://basicsaboutaerodynamicsandavionics.files.wordpress.com/2017/02/engine-bypass-ratio.png

    Serrated nozzle
    https://basicsaboutaerodynamicsandavionics.files.wordpress.com/2016/03/nozzles.png?w=1024

    in reply to: Aircraft 101: Radars, stealth, ECM and more! #2168341
    mig-31bm
    Participant

    Thank you garrya, your articles are treasure of information

    in reply to: 2017 F-35 news and discussion thread #2174215
    mig-31bm
    Participant

    Again, what model of F-16?
    Because, given that the wing area doesn’t changed while the weight increased at every new version, the wing loading changed dramatically along the years.
    And an high wing loading is a good thing for a strike plane as it made it a more stable platform.

    all f-16 model have higher wing loading than F-106, Mirage yet it is a much better energy fighter.

Viewing 15 posts - 166 through 180 (of 1,759 total)