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Satorian

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Viewing 15 posts - 661 through 675 (of 690 total)
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  • in reply to: Chinese News, Photos, and Speculation #10 #2527821
    Satorian
    Participant

    but it sounds a little like the Russian claim that their RAM paint that can decrease RCS by 500%.

    Now, hold on a second. When you reduce something by 100%, you are left with 0 if I’m not mistaken.

    What do you get by reducing something 500%? What is less than no radar reflection?

    in reply to: F-22s in the Middle East since February? #2533493
    Satorian
    Participant

    The news story has been corrected in the meantime. The original version, dated May 1st, read “Japan”, while a revision on May 2nd read “Middle East”.

    It’s back to “Japan” now.

    in reply to: New Eurotrainer Programme #2535111
    Satorian
    Participant

    Wow, somebody necro’d a five and a half years old thread.

    in reply to: Canards and the 4++ Gen. aircraft #2535482
    Satorian
    Participant

    Sustained turn-rate has something to do with t-w-ratio or t-drag-ratio to stay correct. Another important factor is the related wing-load.

    Shouldn’t thrust to wing area figure into it somehow? I imagine that the wing area effectively works like a huge air brake with increasing angle of attack. That’s a point where I could see deltas suffer from when it comes to sustained turn rate. It seems to me that there should be a function of alpha-dependent drag versus thrust.

    in reply to: Japan and the F-22 #2537513
    Satorian
    Participant

    Japan is different, they do borrow some things from China like the characters.. but they use them differently, and they often use their own way of pronouncing things. Like the word for Great in Chinese is Da or Dai. In Korean it is Dae, but in Japanese it is Oo. very different. the Japanese also can say Dai but they almost always use Oo. the Japanese culture still keep alot of pagan, old style beliefs, and worse is that they tried to force it on other people like the Koreans and Taiwanese.

    Actually dai is used quite a bit in Japanese and they use two readings, onyomi (kind of “chinese style reading”) and kunyomi (kind of “japanese style reading”), with onyomi typically being the case for words that are kanji compounds.

    in reply to: Rafale news #2538645
    Satorian
    Participant

    LEt me guess.
    Is the name of your source called Jacko ?

    Try AFM 09/2004. I don’t have the issue myself, but it is supposed to be stated there about the Singapore trials.

    Typhoon: Hot day, 4 BVRAAMs, 2 ASRAAMs, center drop tank = M1.21
    Rafale and F-15 failed to demonstrate supercruise.

    But as I said, that’s nothing I’m really interested in. I was just interested to see whether the SFC could hint at any difference in technological development between them. Seems they are equal in that regard though.

    in reply to: Rafale news #2538647
    Satorian
    Participant

    BTW, I guess we’ll all agree that agility or speed aren’t the most important features of a modern air combat.

    Well, there is no single most important feature, seeing as it a system within a combat space with several important and defining factors. But, agility and speed are still pretty damn important.

    I wasn’t really looking to compare both aircrafts as a whole again. I just wanted to see whether their technology regarding SFC was anywhere near equal.

    in reply to: Rafale news #2538714
    Satorian
    Participant

    Another thing with all this M2 talk:

    http://www.dassault-aviation.com/en/defense/rafale/aircraft-characteristics.html?L=1 only claims M1.8+. Are there any other manufacturer claims or recorded trials where it hit M2?

    in reply to: Rafale news #2538715
    Satorian
    Participant

    And a B747 is more powerfull than a Typhoon. So it’ll beat it in dogfight uh?

    Did I say anything about one plane beating the other in a fight? No. I was rather thinking in terms of packages, speeds and relative consumption.

    The Rafale engines may be 20% less powerfull but the plane is also 20% lighter.

    Yes, and still goes about 15% slower when ordered to go somewhere at full military in A2A config.
    As for the weight, from ~M0.6 on thrust:drag is more important than thrust:weight. That’s where they break even and where the advantage shifts from the Rafale to the Typhoon, assuming there are no freak physics or oddities in thrust from installed thrust to thrust at speed.

    And since both SFC are equivalent, the Rafale consume 20% less.

    While going slower. At equal speeds both should produce about the same amount of thrust and should have comparable consumption.

    in reply to: Rafale news #2538719
    Satorian
    Participant

    Try it with the max dry or full AB thurs on both engines, that’s why.

    At max dry the EF2000 is faster. In the SG trials it demonstrated M1.21 with A2A loadout and drop tanks as far as I know, while the Rafale failed to demonstrate supercruise or barely broke M1.
    At full AB and M2, as drag rises to the square, speeds in relation to the thrust virtually level off, but I consider it likely that the EF gets to M2 quicker, seeing as how the comparative supercruise speeds show a more favourable thrust:drag ratio for the EF, and from around M0.6 drag should put more force on the EF frame (and I assume it’s similar for the Rafale) than weight. The dash should be a tad quicker in the EF.

    Who spoke of a “lower speed” ?
    Both RAfale and Ef2000 can supercruise, and both of them has a max speed close to Mach 2.

    Looking at the difference in supercruise speeds and the difference in thrust figures, I’d be inclined to assume that both planes have similar aerodynamic efficiency, so if the EF wanted to keep up with the Rafale in a package, it should be able to do so with a similar amount of thrust, which means a lower throttle setting for an engine that delivers more max thrust.
    If you are just going for M2 and its whereabouts, then both would probably be at full throttle, I concede that.

    in reply to: Rafale news #2538837
    Satorian
    Participant

    I remember somebody claiming the other way around.

    Jackonicko claimed marginally higher SFC for the M88. Seeing as M88-2 and EJ200 are nearly identical in that regard, one could speculate that the M88 could indeed be a tad worse. Would still be about eye level and probably not worth mentioning.

    Foofone though, for whatever little it’s worth, claimed the EJ200 had twice the SFC of the M88.

    in reply to: Rafale news #2538842
    Satorian
    Participant

    So the Eurofighter has no throttle control? Going slower does not sound like that challenging a task. That must be one of the weirdest arguments to put a positive spin on a less powerful engine at about equal SFC.

    in reply to: Rafale news #2538858
    Satorian
    Participant

    The M88-2 had these figures :
    AB : 1,7 kg/daN.h
    Dry : 0.8 kg/daN.h

    The currently used M88-2 E4 (“Etape 4″=Step 4) has an overall consumption 2 to 4% lower…

    I gave it another run. Don’t know where I screwed up before.

    For the M88-2:
    Dry: 0.8 kg/daN.h = ~22.21 g/kNs
    Reheat: 1.7 kg/daN.h = 1700 g/(10N*h) = 170 g/Nh = ~0.0472 g/Nh = 47.2 g/kNs

    Interestingly, this is pretty much on par with the quoted figures for the EJ200:
    Dry: 21 – 23 g/kNs
    Reheat: 47 – 49 g/kNs

    The M88-2 E4 should be a bit lower then, but still comparable:
    Dry: 21.3 g/kNs – 21.7 g/kNs
    Reheat: 45.3 g/kNs – 46.3 g/kNs

    I remember somebody claiming the M88 family to be wildly superior in terms of consumption, but as it pans out they are very much on eye level.

    in reply to: 21 Apr 2007 – U.S. Navy "Blue Angels" jet crashes #2539896
    Satorian
    Participant

    I hope the pilot is safe and that nobody was injured by the crash and fires.

    in reply to: The F-22 as a strike aircraft. #2540265
    Satorian
    Participant

    I just may go back the second day with my digital video camera and tape the Raptor demo…

    May? MAY? MAY?!

    This is an order! 😀

Viewing 15 posts - 661 through 675 (of 690 total)