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  • in reply to: The PAK-FA Saga Episode IX #2405154
    over G
    Participant

    The gain of weight on the 22 was a structural problem, not a stealth one…they did not stuff in it 5 tons of RAM…they did refit the structural issues with composites (which, should not be confused with RAM, or stealth), and the related structural problems with their new high temperature engine..

    These extra 5 tons had nothing to do with stealth

    I don’t get what has to do the frequency, delay reaction etc, in all this

    The 117 is a true stealth design, it needs extra structure to hide it engines, it needs extra structure for it faceted design and extra weight for it RAM

    The 22 is not in the 117 league

    You are bringing here the 17 tons of the Avenger, but the requirement of the 22 was 14 tons, even 12tons for early requests,…all these figures including the stealth flavor…

    Are you sure these 17 tons required for the Avenger were not meant to be used to reinforce the structure for airborne operations, rather than your stealthy flavor?…

    Can you tell me please what is the huge weight gain for the B-2 compared with the B-52???

    in reply to: The PAK-FA Saga Episode IX #2405236
    over G
    Participant

    The YF-22 was an “empty shell” to verify the aerodynamic demands at first similar the YF-23 still in the museum. The YF-22/F119 was choosen as basic for the development because it did offer the least technical risc and cost rise by that. So much the theory. Even simple RAM-coating does add weight.

    Empty weight: 29,500 lb (13,380 kg) of the radar-less and minimum fitted F-117A does give an idea about that.
    Empty weight: 39,000 lb (17,700 kg) of the A-12 Avenger II killed it in the development already. Just to remember the people with a shorter memory. 😉

    Then again, you as the others are vastly overrating the stealth thing you think that the lion share of the 22s problems were stealth, it’s not true…

    Nobody really knows what is the real RCS, and if you believe on these “marvle size” rcs, you must be a kid…or thinking RSC measures don’t have spikes

    Stealth is a save-face argument, since is ok to have an overweighted aircraft, as long is because the stealth thingy…but for the 22 it was not the case

    in reply to: A different kind of stealth fighter? #2405381
    over G
    Participant

    no i cant explain it, but LM say the f-22 has a smaller RCS than the f-117

    Everything can have smaller RCS…depends from where are you looking it

    in reply to: The PAK-FA Saga Episode IX #2405397
    over G
    Participant

    Weight by the stealth demands

    Yeah, because the yf-22 (with a 13tons weight) carried a radar, ECM/advanced electronics systems, and it structure was OK for operational service

    Hint: it was not stealth what did increase it weight

    in reply to: A different kind of stealth fighter? #2405424
    over G
    Participant

    in a multistatic (networked) radar enviorment?

    I can’t tell, i don’t know where are the sources, where are the receivers, you idea is very vague

    The 117, was meant to scatter the signals away from the source,the source was meant to be SAMs, so it shape is not facing directly the ground.

    There are more important things than “planform alignment”

    which scatters large, but very narrow spikes over a controllet set of angles

    Can you explain me how a curved topology can do this???, bet you are just watching the silhouette, and not the actual surface

    in reply to: The PAK-FA Saga Episode IX #2405428
    over G
    Participant

    These requirements were “relaxed”

    in reply to: A different kind of stealth fighter? #2405475
    over G
    Participant

    Again I ask…What alternate universe are you living in?

    In a universe called reality..

    in reply to: The PAK-FA Saga Episode IX #2405490
    over G
    Participant

    While i undertsand the engine is the key factor, it is vastly overrated as the rcs/stealth thing, can you give me a clear explanation why the F22s rcs is so unsurpassed?, please other than typical things we read on magazines, in which the F22 is by default the 8th wonder without giving any real explanation why..

    A design the USAF did not want, an eternity to develop it, overweighted, a completely different aircraft from the original specifications, without all the marketing make up the raptor’s program is the worst joke in the last 30 years of military aviation

    in reply to: A different kind of stealth fighter? #2405498
    over G
    Participant

    F-22 have already proven stealth works.

    The only true stealth plane was the 117, the only true stealth concept was actually the “hopeless diamond”, hopeless diamond went more faceted, because a nasty little thing called boundary layer…the modern stealth design is a mix of compromises of LO and aerodynamics…

    The deal with stealth was to take all the energy and reflect it on limited areas, so at certain areas the RCS will be extremely high while leaving some silent areas

    The only efficient way to do this is with the faceted design, not even supercomputers can change the laws of physics..there is not such thing as “curved stealth”, the design must be faceted, and is better while it has less and less facets.

    Curves are composed by infinite facets, more facets, less stealth

    The F22 is not a full stealth design

    before you reply, please, give me a real explanation, and don’t try to hide in the supercomputers thingy

    in reply to: The PAK-FA Saga Episode IX #2405503
    over G
    Participant

    What is the source of that Picture, Otaku?

    the same as saying that they do not have the talent to produce the F-22.

    The only big deal on the 22 is it engine, and is not even that big…

    in reply to: A different kind of stealth fighter? #2406281
    over G
    Participant

    The advantage of a hood you just blow off is exactly what you say – if the bay is recessed then the return is still low, so if you run out of them well it’s not going to matter much – you’re more likely to run out of things to shoot anyway.

    Someone is going to come up with the “Keep it simple stupid” 4.5/5th gen fighter. Right now I suspect it will be China.

    And if it’s widely exported, it’ll be a game changer.

    I really thought the russians were on the target, but after i saw these bay doors on the berkut…i lost all hope 🙂

    China will most likely copy the same overcomplicated designs

    Mig was the man for the job, not sukhoi

    in reply to: A different kind of stealth fighter? #2406315
    over G
    Participant

    What IS the point of band-shifting the IR emissions of exhaust pipe then?

    You must be kidding, there is no band shifting, temperature is the same

    Even if they are “shifting” bands, they are going to lower bands, meaning lower temperature and more flow, lower bands have better range, we are not talking about LF EM signals, these are IR signales with a quite decent frequency…

    Dry power helps, because there are more important factors for fighters, one of them is the capability to manouvre at higher speeds, AB thrust is sensitive to manoeuvres

    Also AB is inefficient, but because is a low pressure combustion, meaning the fuel does not burn well…but that does not mean the exhaust gets higher temperature

    in reply to: A different kind of stealth fighter? #2406325
    over G
    Participant

    Some kind of cheap compossite detachable plates to cover the bay, probably, still if is reccessed then the aspect to get a decent return is limmited with or w/o plates/covers

    I agree, this is the kind of cheap and easy solutions we are not seeing

    in reply to: A different kind of stealth fighter? #2406337
    over G
    Participant

    a relatively cheap fighter aircraft, with inherent advantages over 4/4.5 gen aircraft.

    This is the whole thing, how to make a cheap plane, how?, first -IMO- eliminate the closed bomb bay, design an open one with hidden ordenance.

    Second a plane with AB, no need to be worried about IR signature, supercruiser does not offer IR stealth, thta’s not true, but then, running for conventional technology then is better to improve the AB technology rather than design more and more expensive turbines.

    Going into a conventional airframe, max 15-10% of composites

    Choosing a delta mirage2000 like airframe

    Such plane will have inherent advantages over 5th gen plane as well

    in reply to: A different kind of stealth fighter? #2406343
    over G
    Participant

    So you are volunteering to test that against IRST cueing?
    What does F-22’s “LPI” radar have to do with full passive tactics?
    I believe the OP’s idea of NO RADAR would have a pretty low emissions siganture, would you not? (obviously “you emit you die” applies about as equally to both ultra-low X-band stealth ala F-22 and moderate 4.5 gen RCS ala Typhoon)

    I didn’t see anybody mention pulling 20-30-50 G’s in this thread, much less 2 G’s.

    Could you give me a link for how one is supposed to be able to band-shift AB plumes?
    But sure, aerodynamics (and active cooling) play a big part in IR sig management, particularly front-on/lateral when not using AB, i.e. for the purpose of choosing terms of engagement rather than helping your IR counter-measures when you’ve already been targeted and are being chased.

    IRST is quite overrated, from russians to euros to US systems, all them quite overated, also is a problematic system

    The g limit claim is popular on UAVs, many people think UAVs will be always small, for a UAV fighter of the capability of a EF, you need a UAV of the EF size 🙂

    About AB and dry thrust, tell me what is the deal about plumes, plumes is a consequence of the exhaust velocity/temperature, that’s all, a plane supercruising will still have plumes, if don’t have them, then it engine is horrible inefficient and will throw to the system more heat than is needed…

    Aerodynamics play a role way more important than the ones you are claiming, less drag, less thrust needed..

    No radar is a dumb idea, the fighter is a hunter, it needs initiative, and should not depend on the enemy….stealth as you put won’t work…is actually a bad joke, i did put the F22’s example, because not even LM-USAF believe on that tale.

Viewing 15 posts - 496 through 510 (of 1,640 total)