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lukos

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  • in reply to: Saab Gripen & Gripen NG thread #3 #2187365
    lukos
    Participant

    Who says the range is poor? Combat radius depends on the mission and flight profile and what fuel reserve they mandate operationally, chances are that with a 37% fuel fraction range is very good.

    in reply to: Dassault Rafale, News & Discussion (XV) #2187368
    lukos
    Participant

    i havnt seen it mentioned, but there is another very good reason to stay high: Range,
    a fighter takes a horrendous penalty in range by flying low

    Especially if they get shot down or get a bullet in the gas tanks.;)

    There’s just little point in giving an aircraft a sophisticated EW suite and then putting it in a situation where it’s useless.

    in reply to: Eurofighter Typhoon discussion and news 2015 #2187383
    lukos
    Participant

    As BIO has pointed out, the main driver for AESA was not performance, but reliability. This thing just saves tons of cash on maintenance of the repositioner/swashplate (not the Captor-E, though). I vaguely remember a claim that the calculated reliability of a fixed AESA antenna was so good that they could simply seal the radome for the life time of the aircraft as the few failed T/R modules throughout the service life would not affect performance in any way.

    Who said that was the main driver? I imagine the main driver was that M-Scan is largely defunct in a modern arena.

    There won’t be a single AESA Captor in service anywhere in 2017. There are no fixed contracts, no orders, no budgetary commitment from partner nations, nothing.. All you got is a request for integration on a Typhoon, right.. One functional prototype with old back-end flying on IPA5, that’s nice.. But it’s 30+ AESAed Typhoons in LW or AMI service what really counts..

    Says who? AESA’d Typhoons will start entering service in 2017 and be upgraded to the radar 2 standard beginning in 2019.

    Similarly, I cannot see any Captor-E Mk2 in RAF service by 2019. This radar doesn’t even exist as we speak. There is not even a BAC plane with that thing onboard, let alone a Typhoon testbed. How do you want to finalize development, apply software for new announced capabilities, do the testing, integration, integration with weapons, and produce those in four years is beyond me.. My best bet is 2023 service introduction, 2026-7 full spectrum of capabilities.

    Why’s that? The radar is based on the Mk1 with upgraded functionality, so it isn’t actually an outright new radar. The technology has been trialled for a long time on Bright Adder as stated here if you actually read it the last time I linked it, it will be more of a software upgrade than anything physical. The antenna is already there, all you have to do is tell it how to jam and communicate, which will entail a software update and some integration with the DASS probably.

    http://ukarmedforcescommentary.blogspot.co.uk/search/label/Bright%20Adder

    And please, restrain from quoting the same ARMADA article again, I have already read it and made my own opinion about the dates presented there. Thanks..

    So, if you don’t like what a source says, you ignore it?

    in reply to: Eurofighter Typhoon discussion and news 2015 #2187394
    lukos
    Participant

    I find it almost impossible to agree with you on anything regd. Typhoon vs rest of the world. I do like Typhoon a lot but IMHO it isn’t the aircraft you’re claiming it to be..

    Pffft. Why’s that exactly, because I suggested that in a few years it may be superior to the Rafale, which everyone knows is impossible in the eyes of some.

    in reply to: Dassault Rafale, News & Discussion (XV) #2187399
    lukos
    Participant

    Maybe because it was not necessary ?

    Exactly, and I’m not sure of the conditions where it would be preferable compared to an altitude raid.

    A missile guided via radio-command or laser by the launcher, thus subject to terrain masking or missile guidance link being jammed. Ground tracking system are also subject to countermeasures deployed by aircraft (which tend to be multisprectral too).
    Not mentioning such are unusable in bad weather, i.e low visibility.

    Not if the launcher is on top of that terrain at a high point. Guidance link can’t be jammed if it’s a modulated laser and you’d have to jam it real fast relative post launch, unlike an LR radar SAM, which you get tons of time to jam both before of after launch.

    When that arranges you, probably. 😉
    Are you gonna state ASRAAM has 50+ km range at low altitude too ?

    Don’t know what the ASRAAMs range is at low altitude, it’s range at high altitude is largely limited by the absence of a datalink. CAMM has a range of 25km from a surface launch but both missiles would likely fail from an SL launch against a target at 40,000ft.

    See above.

    Can’t jam a laser and the time span makes jamming impractical for even radio-command missiles and IIR missiles are pretty much immune to anything besides multi-band DIRCM, which no fighter has yet AFAIK.

    in reply to: Dassault Rafale, News & Discussion (XV) #2187446
    lukos
    Participant

    You are comparing Jaguar A raids (for the matter, Al Jaber raid resulted in.. 0 loss), flying manual VISUAL terrain following, with outdated INU.. with Mirage 2000D, and even better, Rafale, equipped with avionics and electronics capable of automatic TF, with dead accurate INUs (even more with radar (and GPS if available) correction), and capable of performing automatic delivery with either dumb boms or PGM.
    Are you sane ?

    I’m looking at all stats from Desert Storm. How many low level raids were conducted over Libya? None. The reason is quite simple, why put yourself in a position where any numpty with an MG can hit you?

    A DDM detected launch triggers automatic countermeasure dispensing in automatic modes. Not mentioning the second pair of eyes in the backseat which helps a lot.

    Which won’t work against a missile being optically guided via the launcher, or being guided by laser and stands a very low probability of working against modern dual waveband, or amplitude filtering IIR seekers. Which is yet another damn good reason to avoid low-level flight, shorter range missiles tend to have a far higher Pk and are relatively resistant to countermeasures.

    Throwing numbers out of your hat in a completely different context. i see you’re not getting better, lukos.
    May I remind you that typical speed of a low-level run for Mirage 2000 & Rafale are between mach 0,92 – 0,96 ? And even closer to Mach 1 when aircraft has delivered its weaponry, resulting in less drag.
    Furthermore, an aircraft flying high above and behind a low and fast flying aircraft will be unlikely to get a shot at it.

    Yes but the missile has to turn to go upwards, whereas a VL MICA is already facing in the correct direction, so overall I imagine the kinematic range is similar.

    Do you even imagine yourself targetting an aircraft in just a couple of seconds, flying at 580 knots ? Very difficult, even more in a hilly terrain.
    On the other hand, a hi-flying aircraft gives you a hell lot of time..

    Not if the launcher is on top of the hill, or a building and IIR missiles lock damn near instantaneously and the latest ones take a fraction of a second to hit Mach 3+, so if they’re working in conjunction with vehicles using advanced optical tracking, you could end up running headlong into a missile at a closing speed of 1 mile/s from 2 miles away or less. Good luck avoiding that. E.g.:

    https://www.thalesgroup.com/sites/default/files/asset/document/STARStreak_05_12.pdf
    http://defencejournal.com/jan99/starstreak.htm

    Unjammable death delivered in seconds.

    in reply to: Dassault Rafale, News & Discussion (XV) #2187456
    lukos
    Participant

    However if you still want to deliver your nukes by aircraft and can’t rely on a very long range missile, I assume their is a logic to low level and lots of electronic assistance.

    We currently only have SLBM warheads, so no aircraft is required for delivery and I imagine we be using long-range ALCMs if we ever did go that route.

    in reply to: Saab Gripen & Gripen NG thread #3 #2187465
    lukos
    Participant

    700 nm + 30 min on station CAP -> >900+ nm combat radius

    And how much time is the F-35 spending on station in its stated combat radius, was it carrying bombs or just AAMs?

    in reply to: Saab Gripen & Gripen NG thread #3 #2187485
    lukos
    Participant

    a heavy bombload is a light fighters penalty,
    but from that pdf we see that Gripen E both has longer reach and fly faster than F-35 with A2A loadout,
    in spite of lower fuel fraction, external stores, and whatnot.
    How do we explain that unless we conclude drag from external weapons is less than drag from building a frame around them ?

    Unrefuelled combat radius is stated as 700nm on page 6, which includes drop tanks (“internal + external fuel”). An F-35A’s combat radius is 613nm without drop tanks. Gripen tanks are 450gal, so it’s basically carrying nearly twice as much fuel as it’s internal only load assuming 2 tanks and more if we assume 3 tanks. So how much would the radius of an F-35 be with 18,000lb of extra drop tank fuel?
    http://flygteknik.mcistockholm.se/filer/mandag/SessionA-Aulankl.13.00/A6_PETER_NILSSON_Gripen_NG_Flygteknik2010_FOR_PUBLISERING.pdf

    in reply to: Dassault Rafale, News & Discussion (XV) #2187536
    lukos
    Participant

    Is it fair to assume that the RAF is giving up on low level penetration once the Tornado is retired? Relevant to the extent that they are a close ally who are no longer convinced of the validity of the tactic (when did they last operate in an offensive environment at low level)?

    I think the last time they used it was Desert Storm and the results were undesirable. It was a cold war tactic intended to avoid being confronted by several dozen squadrons of superior fighter jets not weighed down by bombs, which then makes the danger of high altitude worse than low altitude. The idea was also aimed at attacking missile sites before they could retaliate which, however unlikely, was even less likely at altitude. Given up completely I guess would depend on the adversary but logically there’s no good reason for using it after the F-35 has been introduced. Low altitude flight just poses so many more dangers, even without MANPADS and AAA, you still have terrain and bird strike to worry about, or even just crap being blown about by the wind. Even assault rifles and .50cal MG fire becomes a danger at 200ft, I could even add helicopters to that list, either via their own weaponry or simple by collision. Then you have all the mini-drones that are now around, not to mention cruise missiles potentially coming the other way. The enemy would need to have a very, very strong airforce and a fail-safe way of detecting stealth fighters for it to even be considered I imagine.

    in reply to: Saab Gripen & Gripen NG thread #3 #2187538
    lukos
    Participant

    Again, you are not alone on this forum of underestimating the external drag. As for the idea that conformal weapons carriage reduces this drag “very little”, no hanging the weapon in the airstream is ALWAYS going to increase drag.

    I think this point has been covered at length before and can easily be seen by the fact that fuel load has negligible impact on drag, indicating that external stores are the main culprit. A small car with a roof rack will always have more drag than a big car running clean too, assuming they’re of the same era.

    in reply to: Saab Gripen & Gripen NG thread #3 #2187552
    lukos
    Participant

    There is no people on the outside of this bus so its very aerodynamic. (hehe)
    http://www.carsbase.com/photo/Neoplan-Starliner_mp608_pic_38526.jpg

    There is people sticking out from this motorcycle so its less aerodynamic and draws more fuel (LOL)
    http://www.motorcyclistonline.com/sites/motorcyclistonline.com/files/import/header_images/122-1301-01-o%2Bmotorcycle-communicator-systems%2B.jpg

    I’m over doing this a bit here but this is to get the point.

    Just look at the f-35 for gods sake, everything is “inside the shell” but it does mach 1.6 at maximum power (43,000 lbf 191 kN) DOUBLED gripens horsepower. ITS also aerodynamic as hell, BUT IT IS FAT AND BIG.( i know, a girls dream)

    You’re overlooking the aspect of engine design. The F-35 engine is designed for fuel economy at subsonic cruise, not supersonic performance. As for the Gripen, what speed does it do with two 2k JDAMs, 2 AAMs and a targeting pod? I’m betting less than Mach 1.67, especially if you start adding drop tanks to give it the same fuel fraction, except it’ll need to be a higher fuel fraction for equivalence because they’re external.

    In fact it only states Mach 1.6 as the top speed of the Gripen NG here in their own pdf.
    http://flygteknik.mcistockholm.se/filer/mandag/SessionA-Aulankl.13.00/A6_PETER_NILSSON_Gripen_NG_Flygteknik2010_FOR_PUBLISERING.pdf

    FLIGHT TESTS
    FLIGHT TEST COMPLETED
    187 flights performed
    RESULTS
    Speed Mach 1,6
    Super cruise Mach 1,2+

    lukos
    Participant

    Lukos, less.
    There’s not even something so basic has a production contract for Captor-E.

    There’s an integration contract, which is currently under way as of last July, and you don’t normally integrate something unless you intend producing it. So Captor-E is a definite near future upgrade unlike conformal radar for the Rafale, which requires a study, then design, then development, then integration, with no timescale or even an estimate of completion date.
    https://www.rusi.org/analysis/commentary/ref:C53C54C0115349/#.VUtxj_lViiY

    in reply to: Saab Gripen & Gripen NG thread #3 #2187564
    lukos
    Participant

    Again the obsession with “G”. Turn rate expressed in degrees per second is more important than pulling maximal “G”. An aircraft at 350kts will have a smaller radius than the aircraft at 600kts pulling more gees. An aircraft at it’s corner speed will outturn an aircraft pulling the same amount of G if it’s well above it’s corner speed.

    The NASA studies on the X-31 vs. the F-18 were interesting. The X-31 had worse turn performance and less power, yet won the majority of the engagements due to it’s ability to “cut the corner” on turns using TVC at slow speeds.

    Winning a turning engagement more nuanced than who can pull the most g, or more accurately sustain the most g. An energy fighter is going to want to stay fast and only trade energy for position (use the vertical), a fighter like the Super is going use the turning fight to bleed energy from the opponent to where the Super has the advantage in lower corner speed and nose pointing.

    There was an interesting article in “Combat Aircraft” I believe. It talked about exercises between the Typhoon and the Hornet. Basically, the Typhoon pilot was talking about avoiding the first turns of the Hornet and using the superior power of the Typhoon, not to get into multiple circle turning fight.

    Yep, another important factor is being able to regain energy following ITR manoeuvres and using superior thrust to climb whilst turning. It’s far from one-dimensional.

    in reply to: Saab Gripen & Gripen NG thread #3 #2187567
    lukos
    Participant

    So to sum it up:

    Gripen:
    [ATTACH=CONFIG]237292[/ATTACH]
    Cheap

    Eurofighter:
    [ATTACH=CONFIG]237293[/ATTACH]
    Powerful & mildly pleasing lines but can’t turn :p

    F22:
    [ATTACH=CONFIG]237298[/ATTACH]
    Very expensive tires.

    F35:
    [ATTACH=CONFIG]237295[/ATTACH]
    Self explanatory

    Rafale:
    [ATTACH=CONFIG]237296[/ATTACH]
    Not as fast as the Veyron but…

    Nic

    That’s interesting, you think a Huayra is faster on a track circuit than a Veyron, which ‘can’t turn’. Aside from the Top Gear lap where Pagani cheated and used cut slicks, do you have any proof of that?

Viewing 15 posts - 316 through 330 (of 1,752 total)