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franc

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Viewing 15 posts - 211 through 225 (of 509 total)
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  • in reply to: F-15, F-16, F-14, Su-27 and MiG-29 aerodynamics #2456280
    franc
    Participant

    to me, the Su-27 mixed Concord with F-14, the MiG-29 mixed F-14 with F-16, the F-15 just is a MiG-25 curved.

    in reply to: AESA fighter radars #2456558
    franc
    Participant

    AESAs can use spread spectrum techniques, transmitting multiple low power pulses over a wide frequency range and integrating them. It makes it harder to detect.

    It is not a simple task to vary the frequency emitted by a number of modules while keeping the phase relationships appropriate. It is next to impossible to form a beam out of spread spectrum signals using phased arrays because each component needs a different phase relationship. The only viable method is to dedicate one module for one frequency. It is also possible to use multiple channels in one module, but that is essentially multiple modules in one package.

    Also, the signals of all the modules participating in forming a beam MUST be synchronized to each other.

    Bottom line, spread spectrum as you know from communication systems doesn’t exist in Radars. The best you can do is a bunch of individual frequencies. Now, those returns can not be combined in time domain. You can only combine them on raster. That will not improve detection, but will only aid in resolution.

    Completely reversal opinions makes me fall in vague notion about AESA and PESA.:confused::confused::confused:

    in reply to: AESA fighter radars #2456561
    franc
    Participant

    Plain wrong. Read up earlier post for the clarification.

    If you are right, and combined with StealthSpy posted #82
    The AN/APG-81 uses advanced technology compared to the F-22’s AN/APG-77, but airframe constraints mean that it has fewer T/R modules, thus limiting its range to 165 km.
    which means detectable range of AESA depends on how many T/R modules contaimed, then what’s advantage AESA taken over PESA? :confused:

    in reply to: AESA fighter radars #2456564
    franc
    Participant

    there is such thing as standard fighter RCS. The Russians use 5 m^2. Just look at all of their fighter radar displays. Frankly, the Russians don’t have any 2 m^2 fighters to do the test on. It’s either 5 m^2 with Mig-29s or a really huge number with su-27s. If you have any proof, please post a picture to show, all the Russian radar displays that I’ve seen are using 5m^2 as targets.

    :confused::confused::confused: Why flyable MiG-19, MiG-17 couldn’t be used?

    in reply to: Stealth single tail #2456886
    franc
    Participant

    planeman:

    your slanting vertical fin could be stealth, but that depends on what angle of direction the radar wave comes from.

    in reply to: FC-20 #2459901
    franc
    Participant

    ugly indeed

    in reply to: F-22 Raptor in U.K. #2465985
    franc
    Participant

    You need to get your eyes checked.

    What? I only saw flap on the F-22 was released dawn a little bit, didn’t see wing of the F-15 was UP. Who can come to take a look? :eek::confused:

    in reply to: F-22 Raptor in U.K. #2466196
    franc
    Participant

    I’m talking about even at higher speeds. For instance check out these two pics of it flying with an Eagle. The Eagle’s wing is all cleaned up while the F-22 is still at partial flaps. Not saying it’s a good or a bad thing, just wondering the reason for it.

    http://forum.keypublishing.co.uk/attachment.php?attachmentid=163822&d=1216387929

    Be careful, the photo you posted didn’t show what you were saying.

    Although your express is right, but what you said wouldn’t present during subsonic flight.

    in reply to: Su-34 vs F-15E – design and performance #2466290
    franc
    Participant

    I think only F-111 can compete with this Su-34, but it has retired.

    in reply to: SU-35 vs. the European fighters #2466315
    franc
    Participant

    The topic is Su-35 vs EF2000, but I don’t know where it is going now

    in reply to: Su-34 vs F-15E – design and performance #2466829
    franc
    Participant

    what is 2018 bomber?

    in reply to: Su-34 vs F-15E – design and performance #2466914
    franc
    Participant

    The first time when I saw the Su-34 and its payloads, I though why so many pylons with large space between these pylons, only 8 tons bombs could be carried?? Many jets which smaller and lighter than it, but also could load approxi 8000 kg as well.

    in reply to: F-22 Raptor in U.K. #2467086
    franc
    Participant

    As for the problem of altitude….I think if the fighters want to show their skill to the viewer on the ground, their flight altitude should be at the similar low-level……

    As for probability that F-22A and/or EF-2000 doesn’t/don’t do their best in the video I’ve gotten……well, may someone here provide the better video(s) to me?? Thank you very much.

    According to AIR International 2008 July, “Raptor swoops into Britain”:

    Major Paul D “Max” Moga, the pilot for Raptor’s airshow in UK:

    1. The skills that Raptor will show in UK: tail-slide, extreme turning, back-flip, Helicopter J-turn, and Power loop.

    2. The range of Raptor’s G-load during the airshow: -3/-2G ~ +9.5/+10.5G.

    3. The maximal instaneous turn rate during the airshow: more than 40 to 50 degrees per second ~Personally, I don’t believe this kind of turn rate can be achieved in traditional turning, which will cause the G-load which is so high that it’s impossible for human’s body to endure it. I think it can only be achieved during the skills of superagility, such as Helicopter J-turn or back-flip.

    What is extreme turning?

    in reply to: SU-35 vs. the European fighters #2468000
    franc
    Participant

    In operational circumstances, range is not a massive concern a.k.a IFR, 3D turn ability very useless until flight regime allows it, stick the gripen with cobra helmet, IRIS-T, all TVC advantages have been more than accounted for. Does anyone know sustained turn rates, also instananeous of su-35?

    ive got a normal gripen A as sustained, 21 degree/sec, instan, 30 degree per sec.

    Climb rate will be around the 50,000 mark, so guess su-35 has it beat there.:p

    The maneuverability of Gripen was quite good according to your data if it was right, but maneuverability and agility are different things.

    in reply to: SU-35 vs. the European fighters #2471089
    franc
    Participant

    Was Link-16 equiped in F-22?

Viewing 15 posts - 211 through 225 (of 509 total)