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wrightwing

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  • in reply to: The latest Mig 31 Variants should be feared. #2480889
    wrightwing
    Participant

    I would like to know, how many additional weight and compromise this “can” cost the designers. Someone remember the story from the 1990s about an aircraft with 14t OEW. Last time I checked we have been at 19t. Thrust to weight, wing loading and fuel fraction all no big improvement over the F-15.

    The thing to remember though is that the F-22 has as much dry thrust as an F-15 in max A/B, and isn’t carrying any draggy external stores. Additionally it’s operating 10-20k feet higher. When the Raptor does light its burners, it has more than 20k pounds more thrust than the Eagle. If you compare the T/W with similar fuel loads the figures will look a lot different.

    As for the speed claim- that was Paul Metz who made that statement, and the claim was that the Raptor could go faster than 1600mph(M2.42).

    The 28deg/sec sustained turn rate was mentioned in the video by the Air Force F-15 pilot, at Red Flag.

    As for unlimited AoA- that means that a pilot doesn’t have to concern himself with stalling his aircraft, so he can fly more aggressively.

    in reply to: The latest Mig 31 Variants should be feared. #2480914
    wrightwing
    Participant

    F-22 is limited to M1.8 cause parts start falling of and the tail breaks up.
    MiG-31 is limited to M2.8 cause the engine burn up.

    Source please.:rolleyes:

    in reply to: The latest Mig 31 Variants should be feared. #2480963
    wrightwing
    Participant

    The specifications of the F-22A. At close to Mach 2 the coating starts suffering in a tremendous rate, even at the less dense air above 35000 feet.

    Can you send me a link to where you’re getting this information.

    in reply to: Good News for the F-35 Program #2480990
    wrightwing
    Participant

    Obligatory, thx for the link.
    I’ll just quote “The slight buffet remains constant from twenty-six degrees to about forty degrees AOA, where it decreases.

    Well, so much about unlimited AoA for Raptor 😀

    Cheers, Cola

    How is feeling a slight buffet akin to a AoA limitation, anymore than feeling a slight buffet when the sound barrier is broken? So long as the aircraft can perform carefree without worrying about loss of control, then what more can you ask for?

    in reply to: Good News for the F-35 Program #2481037
    wrightwing
    Participant

    That can happen, when the F-35 does fell short of the exspectations and there is no longer the need for that. and advances in technology do render the present stealth useless.

    And when can we expect these advances to occur? There’s never going to be a point in time, where a stealthy target will be detected/tracked at the same range as a non-stealthy one, so long as the laws of physics remain in effect.

    in reply to: Good News for the F-35 Program #2481062
    wrightwing
    Participant

    ~15.4% is not much really. I can understand when figures as high as 1.8 are said for the Raptor, that figure is more substantial over 1.2~3 and will give decent benefits of a good distance or time. I’m still unsure of the actual combat significance of SC though as any combat usually lasts minutes at the most, now would SC play any advantage in such a short time? From what I gatherer it can help in giving advantagous postions for missile shots without using AB/fuel savings etc..but if ; detection, tracking, firing only lasts minutes wouldn’t any fighter be using all they can such as AB to gain any advantage anyway, trying to use all the physical performance of the jet?

    With the F-22’s LO ability, it allows it to fire from different positions during BVR in the sky indeed alot more easily and possibly not be detected, and if the distances are great between firing points, SC I guess comes in pretty handy right? Again are they large enough to make SC a significant advantage, I’m not sure. It pretty sure there was a thread, I’m gonna go find it.

    here are a few advantages off the top of my head.

    SC means that you can disengage at will, as your persuer will run out of gas chasing.

    It also means that you’re a more difficult target(i.e. NEZs are smaller, and you’re over threat areas for less time).

    You can intercept a target more easily.

    A defender has less reaction time to put up a defense.

    in reply to: Legitimacy of DPRK nuclear threat #2481114
    wrightwing
    Participant

    I think the point was their treatment as tragedies. While 9/11 is constantly being mentioned as such a tragedy and monumental loss of life, the fact remains that there are tragedies of at least equal magnitude where human lives were lost that people barely noticed or are unlikely to regularly remember.

    It’s true that any loss of life is a tragedy, but there’s a big distinction between being murdered, and a natural disaster where no malice was involved.

    in reply to: The latest Mig 31 Variants should be feared. #2483760
    wrightwing
    Participant

    It goes as fast, as the digital control does allow. A stealth coating gone above Mach 1,8 or damaged is a F-22A out of business for some time or a “soft-kill” for the adversary.

    And where is it said that the stealth coating’s limit is M1.8?

    in reply to: Good News for the F-35 Program #2483836
    wrightwing
    Participant

    I hope you’ve seen my quote of Code One Magazine from 1998 where they defined it as greater than M1.

    I have seen that article from 11yrs ago, that you posted. How long ago did they change the figure though? It hasn’t been that recent.

    in reply to: Good News for the F-35 Program #2484264
    wrightwing
    Participant

    The reason is quite obvious – they set the criteria in order to make the F-22 unique, a category of its own. If F-22’s top SC speed was M1.4, then LM would have come up with the definition of SC being able to maintain M1.3 on military power. It only requires several pfcems to repeat that blindly enough times to become *truth*.

    M1.3 wasn’t the KPP requirement though.

    in reply to: Good News for the F-35 Program #2484311
    wrightwing
    Participant

    Given the amount of marketing F-35 enjoys, I’d dare to say that if there was slightest indication of F-35 being able to achieve/maintain supersonic speed at military thrust, we’d hear that trupmpeted out all over the news.

    I would also say that if this was the case, then LM would immediately drop their requirement of M1.5 as definition of supercruise. The reasons are logical – creating a separate category for F-22 is pointless since there will be no exports, anyway. At the same time, kicking out the F-35 from the supercruise category just for that would be plain stupid – F-35 is and will be battling other designs in various competitios around the globe and it needs every argument that would help it win. Supercruise yes/no is definitely a selling argument (although I personally still see this feature as completely useless)

    The separate category for the Raptor was for US audiences(i.e. the folks with the purse strings). If the USAF and LM are trying to get more Raptors, they want them to be shown is a good a light as possible. If the F-35’s capabilities are too close, then these folks start asking why buy Raptors. My guess is that if 187 ends up being the final number of Raptors, then we’ll start seeing more specs released about the F-35. As for foreign markets, the F-35 is already doing pretty well. The countries that have gotten briefed on its capabilities have apparently been impressed.

    in reply to: Good News for the F-35 Program #2484337
    wrightwing
    Participant

    There is no definition about sc, except from some fanboys here.
    Supercruise does mean, that a fighter can stay supersonic on installed dry.
    For the former supersonic cruiser of Boeing it was Mach 1,02. One of the sweet points or lowerings in the otherwise rising supersonic drag in the transonic range, which will peak around Mach 1,2 and drop considerably after Mach 1,5.
    http://en.wikipedia.org/wiki/Supercruise

    For all intrested, the inlet design is cruical. Without that the F-35 can not do sc. Sofar LM does not claim nor do advertise that feature for the F-35,

    Au contraire, LM doesn’t claim supercruise(which they define as M1.5 or greater).

    in reply to: The latest Mig 31 Variants should be feared. #2484364
    wrightwing
    Participant

    2.What cannot be utilized/deployed, does not count. Designing a fighter allegedly capable of doing M2.42 and then limit it to M1.X is pure waste of money and weight. It has been done before (read F-14 or Su-24), only idiots would repeat the same mistake.

    You’re confusing the speed with AB vs. the speed on dry thrust. If the Raptor needs to fly faster than M1.8, then it’s perfectly capable of engaging its AB and getting up to 1600+mph. Also, the 2.42 is somewhat ambiguous, as we don’t know what that + works out to be. It’d be more accurate to say that the Raptor can reach speeds of at least M2.42(or more).

    in reply to: The latest Mig 31 Variants should be feared. #2484396
    wrightwing
    Participant

    In service is a question of someone ordering them. The R-33S is already 200+ KM range, which is very high.

    They are huge, but that does not matter. They have massive warheads and high kinetic performence. They have been rated for 12G targets.

    The NEZ might not be 400KM, but it’s a hell of a lot higher than medium range AAMs.

    The ranges, again, are still higher than medium range AAMs, which is what counts.

    The thing to remember though is while it may be nice to have a large ballistic range, it doesn’t do you much good if you can’t take advantage of it due to your detection ranges being a fraction of the distance. Those long ranges quoted are based upon being fired in an ARM against an emitting AWACS, not guided by the fighter’s radar. When fighting fighters, you’d be better off with higher numbers of missiles that have tactical usefulness(ballistic range/NEZ more closely coincides with detection ranges). Additionally, if a radar is emitting a signal 400km, you can bet any potential target will be well aware of it long before they’re detected, and probably even get a shot off themselves, silently.

    in reply to: Good News for the F-35 Program #2487222
    wrightwing
    Participant

    With that I agree.

    While, personally, I would tend to consider it a hint that their marketing department does not milk a potentially given SC ability or that sample mission profiles in LM presentations had it cruising at M0.9, I would in no way claim that this is conclusive evidence. I wouldn’t be surprised either way and look forward to full envelope testing of production-representative units.

    That’s all I’m saying. KPP thresholds, and vanilla public briefs are certainly not proof of what can or cannot be done(other than not meeting the minimum requirements). I suspect we’ll hear a lot more in due time. We keep finding out new things about the F-22, and it’s been operational for several years, so I see no reason to expect to know the performance envelope of the F-35 already.

Viewing 15 posts - 2,491 through 2,505 (of 3,666 total)