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TooCool_12f

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  • in reply to: Canards and stealth. . . #2404354
    TooCool_12f
    Participant

    Kiwinopal, you took some time to try to explain your version of what happens at the crest of the cobra maneuver , ie. at 120 degrees. Now let me tell you why I think you are wrong.
    At a perpendicular angle of 90 degrees, before the apex of the maneuver is reached, the plane is moving through the air at several hundred miles per hour with its nose pointing straight up, any vortex produced by the LERXs will trail behind the plane, the vortex will NOT make a 90 degree turn downwards to be able to wash over the wing and stick the airflow to provide more lift.
    Once it reaches the apex of 120 degrees its nose is pointing past the vertical to a position above and behind it, if we assume what you say is true and the vortex are sticking the airflow to the wing and providing more lift, then that lift will tend to pull the nose of the plane “up”, ie. onto its back. This is not what happens since the plane comes nose-down through the vertical position and back to level flight, so there must be another mechanism at work. or do you also believe in magic?

    actually, to make a cobra, the entry speed is less than 500kph; 275kts according to this site:

    http://everything2.com/title/Cobra+Maneuver

    on exit it’s about 135 kts (say 150 mph…) so, it’s really slow, actually.

    Besides, the whole manouver is explained on the linked site

    in reply to: Rafale News IX #2404582
    TooCool_12f
    Participant

    strange, I either see the future, or all what’s been printed in that article si what’s been said and published for months now…

    – 9-ton engines – UAE wanted it last year already
    – AESA radar, it was part of the deal from the beginning
    – last gen ECM. well, spectra is in continuous development, and the financing continues

    all that should also be linked to the fact that the UAE already with the mirages had the best version of the fighter (even the french air force did not have the capabilities they had), so, all these “improvements are/were part of the deal from the beginning

    – rebuying the mirages 2000-9 was also on the table since a long time (but the french wouldn’t use them for their air force, and would rather find a customer that may be interested. A coupls of months ago, it was even said that they offered them to brasil with the rafale deal, and brasil was interested, from the articles that were posted around here

    in short, not much “news” here.. they keep negotiating about the same things.. seems to me 🙂

    in reply to: Reality of F-35 production cost #2404586
    TooCool_12f
    Participant

    no, you don’t understand, he’s been offered a nice retirement because the costs were so under budget… try to listen to what you’re being said, please… :D:D:D

    in reply to: Why 3 different F-35 ? #2404589
    TooCool_12f
    Participant

    talking about UAE exercises, the USAF did not want to use their radar against the french and there was a mutual agreement not to use either their radar nor spectra -> guns only fight.

    if you have another version (from some serious source) you can always go to the thread talking about it and post it…

    as for the supersonic weapons launch, it’s just as any comercial.. you use words that more or less let potential customers think about things which aren’t there, but if anyone asks “why it’s not there” you just say “we never said that it would be there…” it’s a classic..

    one question one can ask, how many weapons are cleared for supersonic release from any fighter?

    in reply to: Canards and stealth. . . #2404986
    TooCool_12f
    Participant

    just a small correction: on the F-14, the tail is a bit shifted, and not at 90°… otherwise: good points 😉

    in reply to: Why 3 different F-35 ? #2405005
    TooCool_12f
    Participant

    you make assertions, but the reality is: we’ll see what it does once it comes into service and faces other aircraft…

    in reply to: Why 3 different F-35 ? #2405202
    TooCool_12f
    Participant

    actually, the talk about supersonic lauch of internal weapons without giving any precision about which weapons… and specify the launching of AAMs at M1.6

    before one can say “it can launch this or that weapon type, it must be tested and make sure it will separate as it should, and at supersonic speeds, it’s not alsways possible… depending on the weapon.

    which ones it will be able to launch supersonically, we’ll know after they clear the tests about it

    in reply to: Why 3 different F-35 ? #2405450
    TooCool_12f
    Participant

    Mod Edit: Personal insult removed.

    anyway, as far as AASM is concerned, it’s an iron bomb (actually a 500lbs one, but the system is adaptable to anything from 250lbs to 2000lbs bombs) that’s been equipped with a rocket propulsion and a guidance system, allowing it to be shot from a good distance with good precision.

    in reply to: Why 3 different F-35 ? #2405536
    TooCool_12f
    Participant

    Yes, the F-35 can launch it’s weapons up to a speed of 1,6 Ma.

    that’s a pretty strong statement, considering that F-35s max speed is M1.6… (LM data)

    what’s more, to reach that speed, it will have to use teh AB for quite some time, burning lots of fuel while “glowing” for every IR sensor from miles around.

    last, but not least, with that IR signature, it will have big chances to attract IR attacks, and since at such speeds the trajectory will be more or less a straight line, how will it evade those missiles?

    in reply to: Canards and stealth. . . #2406156
    TooCool_12f
    Participant

    nice of you to resume your posting in that single phrase:

    “Don’t bother answering.”

    instead of reading things from people who maybe know better, you just try to shove your ideas down other people’s throats…

    as for your reference:

    you use google, others go (went) to school to study.. there’s a difference

    in reply to: Why 3 different F-35 ? #2406193
    TooCool_12f
    Participant

    the rafale’s cost is in euros. if you express its price in dollars, it can vary a lot depending on euro-dollar parity. For example, as euro is going down right now (and some experts expect it to drop under $1.20 around july/august), up to this summer the rafale’s flyaway price could be around 60 million dollars without dassault doing anything about it (nor loosing any money).

    What’s more, as you said, it’s the F-35s expected price… which will depend on several factors: the ability of LM (and its subcontractors) to deliver, the consistency of ordered numbers, etc…

    in reply to: Why 3 different F-35 ? #2406200
    TooCool_12f
    Participant

    pfcem,

    people state that rafale can’t go to war on first day: where’s the proof? not speculation, but proof? there’s none either.. so?

    there’s a difference, some bet on fully passive stealth, which cost billions to develop and will become useless in near future, and others have chosen to make somewhat LO aircraft which rely more heavily on ECM (upgradable and, therefore, adaptable to future threats) to stay safe… while still being cheaper to develop

    who was right? you have your opinion, I have mine, and the engineers who developed various aircraft have theirs. We’ll only see which design was a better choice in the next 15-20 years, but I doubt we’ll still be on this thread by then.

    Please tell me 1 thing that the French Rafael does better than a F-35 besides turn slighty tighter, or go slightly faster?

    maybe that it’s already operational and efficient for all missions an airforce or navy can ask from an aircraft and that at a fraction of the cost of the F-35? reminds me of the old joke about nasa speding 10 million dollars to develop a pressurised pen capable of writing head down, at 0G etc.. and the russians solving the problem simply by using a pencil. rafale and F-35 is more or less the same story: rafale does everything for a reasonable cost, the f-35 hopes to do more or less everything, and costs multiple times the rafale price

    in reply to: Canards and stealth. . . #2406203
    TooCool_12f
    Participant

    the CoL does move back as the wing stalls, but the drop forward depends on the position of the CoL relatively to the CoG. if the CoG remains in the vicinity or behind, the aircraft won’t fall forward but flat or even flip back (CoG too far back -> unstable -> departs more easily)

    in reply to: Canards and stealth. . . #2406383
    TooCool_12f
    Participant

    And just look at the Concorde’s takeoff speed vs. the 747’s.

    which illustrates the point cola and me are making: straighter wings provide more lift for a given AoA (and speed, since it’s closely related)…

    Says who?

    You’re not too keen on what AoA LIMIT means, are you. The Shornet will be producing more lift at 40° than any of the eurocanards. Higher AoA limit = higher stall angle.

    and you don’t seem to be very keen with the word “software”. the limits you point out are those that the software was programmed not to exceed.

    What’s more, you obviously don’t understand what stall means. it’s not some magical feat, but simply the fact that the air doesn’t follow the wing curvature anymore and becomes turbulent over the wing. from there on, the center of lift moves backward and, basically, the wing “falls forward”. In the case of the hornet, the LERX generate the vortex which help maintain lift even if the wing is stalled (the airflow over the wing is turbulent).

    you can see the result on this NASA pic:

    http://www.nasa.gov/centers/dryden/images/content/85940main_FS-002-DFRC_popup5.jpg

    while at only 30° AoA, you can see that over the wing, the tufts placed there to show the direction of the airflow are all over the place, showing turbulent airflow (and showing that the wing as such is in post stall situation)

    finally, if you want to compare deltas and straight wings? there’s on small story you should be interested in: at the time where there was no flight computer to keep aircraft airborne, Convair had made a delta prototype that led to the F-102. It was the XF-92.

    In the book “Yeager”, the author explains that on his second flight on the type, he landed it at 67mph and 44° AoA. And that was a pure delta with no artefact to keep airflow close to the wing

    in reply to: Why 3 different F-35 ? #2406427
    TooCool_12f
    Participant

    the fact remains that we still have to see a single rafale shot down by any air defence…

    presenting it as being a suicidal machine to fly in doesn’t seem very serious in the first place. When (because it’s not an “if” ) the shape stealth becomes more or less useless (which is just a matter of efficiently proceeding the lower frequency signal, a task that more and more modern calculators shouldn’t have so much trouble in achieving in the not so distant future – Moore’s law, etc…), what will be left is fighters which will be able to do their job because they can adapt and have flying wualities to do so, and the others… how the F-35 will perform once its stealth becomes obsolete remains the question

Viewing 15 posts - 2,626 through 2,640 (of 3,094 total)