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foxmulder

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Viewing 15 posts - 61 through 75 (of 209 total)
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  • in reply to: Chinese pilot practicing carrier ops on Kuznetsov #2376441
    foxmulder
    Participant

    Why? Russia went for MiG-29K over modernizing Su-33, so I am sure India is feeling just fine.

    Why do you thin Russia picked Mig over a modernized Su-33 (like Su-35Naval)? Is it because Mig is a better fighter/bomber than Sukhoi or is it because it was already developed and simply cheaper?

    in reply to: J-20 Black Eagle – Part 6 #2305928
    foxmulder
    Participant

    Is that with the tube or not?

    w/o tube, from end of radome to end of engine, it is 306 pixels, which would put the J-20 at 20.3m

    with tube, it is 318 pixels, puts the J-20 at 19.5m

    20.3 meters estimate is interesting there… An insider has given the same number.

    Perception of J-20 being a huge striker is probably wrong. Its small tails, location of the delta wing (very rear and high on the body) and tall landing gears… F-22 has huge tails, its wing located more forward and landing gears are really short. All these creates an illusion.

    I think J-20 is not longer 20.5 meters (used to estimate it was 21 meters), empty weight and wing area is comparable to those of F-22.

    in reply to: PLAAF Thread 15 #2306087
    foxmulder
    Participant

    Let me start, it is ~20,5meters 😀

    in reply to: General Discussion #289598
    foxmulder
    Participant

    Lincoln, you said ” I am all for Space exploration” but sound like your pretty much against it 🙂

    I am even willing to pay more taxes if it goes to space exploration. This is one of the best things human can do.

    foxmulder
    Participant

    Lincoln, you said ” I am all for Space exploration” but sound like your pretty much against it 🙂

    I am even willing to pay more taxes if it goes to space exploration. This is one of the best things human can do.

    in reply to: J-20 Black Eagle – Part 6 #2318803
    foxmulder
    Participant

    J-20’s main purpose is to cope with F-22 and PAK-FA.

    in reply to: General Discussion #289858
    foxmulder
    Participant

    Have you checked vBulletin to see if this is possible?

    It should.. all the other forums I visit have this feature 🙂

    in reply to: Forum template… #1876971
    foxmulder
    Participant

    Have you checked vBulletin to see if this is possible?

    It should.. all the other forums I visit have this feature 🙂

    in reply to: General Discussion #289867
    foxmulder
    Participant

    It is about resolution and fixed width of the template, it has nothing to do with zooming or not.

    in reply to: Forum template… #1877013
    foxmulder
    Participant

    It is about resolution and fixed width of the template, it has nothing to do with zooming or not.

    in reply to: J-20 Black Eagle – Part 6 #2322608
    foxmulder
    Participant

    the list seems accurate enough for most types – save for j11s. there is no way there are so many su27s and j11s. it is well documented that at best some 100 j11s were produced before production switched to j11b model. and it is also very well documented there were, all in all, 76 su27sk and su27ubk (combined) delivered in the 1990s. I’d therefore lower the flanker family variant figure by some 100 planes. also, what about adding bombers to the list? H6? does anyone know how large h6 squadrons are? i have a feeling they seem to change sizes and that plaaf and planaf squadrons might have different compositions and numbers…

    I think you are forgetting Chinese assembled ones with Russian kits, 95 of them.

    Russia delivered 76 of them then 200 local assemble deal is signed, 95 produced. After that J-11 came and after than J-11B.

    So, ~400 is correct.

    in reply to: J-20 Black Eagle – Part 6 #2324344
    foxmulder
    Participant

    No no no no! Argh! No – those NASA lifting body things are completely different, as buzzlight year would say – they are falling with style.

    Yes, a body can generate lift – but its ability to do that is a function of its camber.

    Consider the F-15:

    http://files.air-attack.com/MIL/f15/f15k_redflag_2_20080808.jpg

    See the positive upper surface camber on what would be the upper external surface of the air intakes? That helps enable lift generation.

    Compare that to the J-20:

    http://static5.businessinsider.com/image/4df0a4c6ccd1d55d42100000/j-20.jpg
    http://www.flightglobal.com/blogs/asian-skies/2011/01/07/j-20.jpg
    Flat. Really flat.

    Then the F-22 (the pics aren’t great, you’ll need to look at both to see what I mean):

    http://files.air-attack.com/MIL/f22/f22kadena_3_0090117.jpg

    http://www.tunersandmodels.com/wp/wp-content/uploads/2010/10/f22-f-15_and_f-22.jpg

    But you can see how the F-22 has evolved from the F-15, it is a similar design philosophy, much refined, but a similar philosophy.

    “Analyzing” pictures to figure out potential lift generated by body of an aircraft is really a pointless effort. One needs wind tunnel testing or relatively complex computer simulations.

    Also, J-20’s upper fuselage has curves for sure, not straight at all.

    By the way, I used 21m for J-20 length.

    in reply to: J-20 Black Eagle – Part 6 #2325518
    foxmulder
    Participant

    Based on:
    F-22 wingspan: 13.56 m
    You’d get:
    Root chord ~ 7.75m
    Tip chord ~ 2.32 m
    ‘semi’-span ~ 4.84m

    = Wing area ~ 48.75 m2

    Based on (right drawing obviously!):
    J-20 wingspan ~ 14m
    Root chord ~ 7 m
    Tip chord ~ 1.17m
    ‘semi’-span ~ 4.67m

    =Wing area ~ 38.15m2

    The MTOW of the F-22 is around 27 tonnes. The MTOW of the J-20 is speculated at over 35 tonnes. I’m sure you can get an idea of the comparative empty and fighting weights… From that will come your wing loading.

    Your figures are different than what I calculated. I am not saying my figures are 100% true but I really trust the image processing software I use.

    I have 40m2 for J-20 excluding canards, canards add another 8m2 or so.

    F-22 has 40m2, too. Also, as far as I know its tail creates negative lift for most of the flight envelope.

    Another point is F-22 MTOW is 38 tonnes.

    in reply to: J-20 Black Eagle – Part 6 #2326203
    foxmulder
    Participant

    Please do not start quoting wikipedia back to me. 🙂

    The use of LERX to generate lift is high drag – while you can pull better AoAs, you destroy your energy levels in the process. The same with wing sweep; highly highly swept wings don’t perform so well in high speed turns.

    The J-20 has a small wing… for a high performance fighter. It is spot on for an interceptor or interdictor. Compare it to, say, the F-15 or F-22, then compare it to the MiG-31.

    Can you state the wing area of F-22 and your guess that of J-20?

    in reply to: J-20 Black Eagle – Part 5 #2383768
    foxmulder
    Participant

    This lenght discussion is fun 🙂

    I want to add something. One cannot use the pictures with truck with high accuracy because we don’t know the distance between trucks and planes. If the truck is close to J-20 that it is to J-10, J-20 will look larger that its real size and vice versa.

    So, measurements from truck pictures can be only rough estimations.

    By looking at J-20 pictures around my guess is it is indeed larger than F-22 but not “that” much. I predict it’s dimensions are very comparable to those of Su-27.

Viewing 15 posts - 61 through 75 (of 209 total)