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Dare2

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  • in reply to: Bad news for the F-35 #2441384
    Dare2
    Participant

    in which case the differences aren’t significant enough that today’s AAM, be it WVR or BVR, would even notice.

    In the real world the differences are significant enough for Typhoon, Gripen or Rafale to significantly out perform and out maneuver the US champion of AoA akka F/A-18, and Typhoon like Rafale pilots uses transonic and supersonic acceleration for gaining kinetic advantages for themself and their AAMs.

    These are not Spitfires and Mustangs, not even F-4s and Mig 21s these are Mach 2 fighters with supercruise capabilties in A2A configuration.

    Try a reality strike.

    in reply to: Bad news for the F-35 #2441388
    Dare2
    Participant

    Of cause it can be done as long it is no hard limit enforced by the FBW-software.
    A GAF F-4F did pull ~12 G to recover from a dangers situation, despite limited to 7,5 G. Of cause it was grounded for some time after that to bring it back into service. Israeli pilots did so in their Mirage and many other too. All that G-limitations are done for safety reasons, preserve lifetime or keep warranty when claimed by the producer. Worst case will be some structure damage and the fighter is forced to become w/o by that. 😎

    They are limited in FCS, aerodynamics, playloads, structural load or all of them at the same time.

    READ again, i included structural load, that of F-35 was lowered to save weight and in many cases they wouldn’t be able to pull more g because they simply don’t have the LIFT.

    in reply to: Hot Dog Typhoon thread III #2441397
    Dare2
    Participant

    That’s what one of the articles states you have posted a while ago under one of your alternates:

    Perhaps well but coupled have a precise meaning.

    Either it is coupled either it is not, simply because it refers to their respective vortexes, they intereact or not and there isn’t a huge marging to achieve this.

    Might be worth noting that EAP is actually derived from the ACA but with a different tail section due Germany’s withdrawl.

    The German gouvernment did withdraw but DASA technical staff didn’t they were there although not at the same level than BAe.

    in reply to: Bad news for the F-35 #2441407
    Dare2
    Participant

    It isn’t photoshop you troll.

    appart copy/pasting stuff you don’t comprehend and insult pple what exactly are you contributing to? 😎

    Lets see…

    Length 51.5 ft : Don’t know why but some sources say 50.5′ (or 50.4′) while others say 51.5′ (or 51.4′).
    Weight empty 29,300 lb : PRE WEIGHT REDUCTION was 29,036 lbs, POST WEIGHT REDUCTION is 26,664 lbs.
    Internal fuel 18,000 + lbs : 18,307 lbs as per official program documents.
    Speed Mach 1.6 (~1,200 mph) : Actual top speed is classified but it is > Mach 1.6.
    Range ~1.200 n. mi : No way that a > 600nm COMBAT RADIUS results in ~1200nm RANGE.
    Combat radius 610 n. mi : 625nm as per official program documents.
    Engine thrust 40,000 lb (with after burner) : Official thrust rating is 43,000 lbs.

    The copy of MY screenshot is the ACTUAL/TODAY empty weight as given by Lockheed Martin in their own website.

    It’s NOT X-Mass yet Mr “post reduction”…

    Speed Mach 1.6 (~1,200 mph) : Actual top speed is classified but it is > Mach 1.6.

    NO This isn’t. This is Maximum Mach 1.6 and about ~ every green monkey in London Zoo knows that it doesn’t mean >.

    in reply to: Hot Dog Typhoon thread III #2441416
    Dare2
    Participant

    It was claimed by BAe and was in one of the issues on the flightglobal page archieves you have linked too. But the same article stated EAP had a long coupled canard configuration, albeit it’s obviously closer than on the Eurofighter.

    I doubt very much they were long moment arm and they CANOT be “long coupled” either.

    BAe claim was correct and they effectively reported a gain in “lift” of 50%.

    They decided to revert to Herbst design configuration.

    http://i588.photobucket.com/albums/ss325/aviadare2/close.jpg

    They visibly studied the close-coupled configuration.

    http://i588.photobucket.com/albums/ss325/aviadare2/close2.jpg
    Thats was an AoA of 45* for the “slow clean pass”…

    1986%20-%202297 and 1982%20-%200310 PDFs Flight-International archives. Enjoy the read.

    in reply to: Bad news for the F-35 #2441420
    Dare2
    Participant

    Here is another excerpt from the document:

    But take a look yourself:
    http://dtas2007.fyper.com/userfiles/file/Paper%2009_Dilger.pdf

    Sorry it doesn’t change a yota to reality.

    Tests are not necessarly destructive test for maximum structural loads, these are visibly not. btw i already have been posted this long ago but YOU should READ documents before making claims, as always.

    http://i588.photobucket.com/albums/ss325/aviadare2/6000.jpg

    in reply to: Bad news for the F-35 #2441425
    Dare2
    Participant

    . Every fighter can start a 9 G direction change, if stressed for that or not. How many seconds does dependent on lift and power at first or you will depart controlled flight. 😎

    In your wildest dreams.

    They are limited in FCS, aerodynamics, playloads, structural load or all of them at the same time.

    A 7.0 g F-35 is never going to pull 9.0, end of the story.

    in reply to: Hot Dog Typhoon thread III #2441435
    Dare2
    Participant

    As you can see from the graph below the foreplane position and the degree of instability is linked.

    cheers

    Jwcook I think there are more factors than what is said in this PDF, i actually read it before loosing it to a bad file management sometime ago.

    Dassault designers desagree with many of Eurofighter findings (So does that of SAAB btw), the solutions adopted by Eurofighters are much more specific to their own aerodynamic arrangements than to the whole of the canard delta family.

    I agree though that Typhoon is optimised for a higher Mach than Rafale, historically it is true, their requierements were totaly different but i am not certain that 8% static instability is only related to the distance between canard and wing on only one plan.

    Further one can argue that the close coupled demonstrated a higher level of pitch control in particular at high AoA and under unsteady airflow conditions, a close coupled canard canot DEPART or enter a super-stall, full pitch control remains.

    For example from the 60s there was a strong will from AdA to see the landing distance of their jet reduced, this lead to the swept wing designs and canards, so the STOL aspect of the integrated canard is common to SAAB and Dassault.

    From where is am standing the close coupled formula was tested with EAP, i can remember Eurofighter claiming an increase in lift of 50% at the time they flew it with the Rafale A but they had an issue with the proximity of the inlet (Low canard position) and reverted to the Herbst solution (Decoupled).

    The effect that both design houses were looking for were tailored to their need and respective experiences they didn’t want to use the same solutions.

    in reply to: Bad news for the F-35 #2441449
    Dare2
    Participant

    Or short the airframe should withstand 18000 h on specified operating conditions.

    I don’t think you understand what these standard mean.

    If the airframe was designed to sustain 9.0 g; the 1.4 figure indicated that its structural limit is 40% above 9.0g before critical failure.

    The 18.000 h figure isn’t representative of what you interpret as being “operating conditions” and looksnot only suspect but also pretty fantasist to me, it would last 18.000 h doing tourism at M 0.90 though.

    The 6.000 h given by Flight International (Actually Stefan Levedag, flight control systems leader at Dasa) are accurate, an aircraft designed to the normal 1.5 standard is expected to last for 7.000 hours under these particular conditions., airframe lifespan is directly dependent of this value and Typhoon is designed originaly for 6.000 h.

    So read again the whole article and try to understand what it really means.

    The ability of carefree handling to control g limits precisely has allowed designers to reduce the ultimate load factor to 1.4, from the normal 1.5, resulting in a lighter aircraft. The airframe is designed for a 6,000h life.
    DATE:16/06/99
    SOURCE:Flight International
    Agile thinking
    http://www.flightglobal.com/articles/1999/06/16/52589/agile-thinking.html#FIPageTop

    Sens
    When you have it, it is public at all. My guess is otherwise.

    No it ain’t and you can guess whatever you please.

    Sens
    Thank you, but it was about the related values at first.

    You’re welcome, i noticed they mention F/A-18 and then added the C after it…

    in reply to: Hot Dog Typhoon thread III #2441463
    Dare2
    Participant

    Cola. I strongly suggest you read the doc i posted you. Cheers.

    in reply to: Bad news for the F-35 #2441466
    Dare2
    Participant

    The reduced maximum load factor wasn’t selected on grounds of performance, but as a cost saving measures when the EFA evolved into the EF2000 in 1992. Yet they still achieved 18000 h during fatigue testing between 1993 and 1998, though it might be that that airframe was built to the original specifications. The production representive MAFT vehicles has been tested up to 9000 h IIRC, but that was the last status I’m aware of, not the end of the testing.

    The ability of carefree handling to control g limits precisely has allowed designers to reduce the ultimate load factor to 1.4, from the normal 1.5, resulting in a lighter aircraft. The airframe is designed for a 6,000h life.
    DATE:16/06/99
    SOURCE:Flight InternationalAgile thinking
    http://www.flightglobal.com/articles/1999/06/16/52589/agile-thinking.html#FIPageTop

    Archives are good to check from time to time, at least they tell things as they were told at the time…

    in reply to: Bad news for the F-35 #2441471
    Dare2
    Participant

    It will be intresting to learn, what legacy fighter is claimed and the real values from that. By the way all data are claimed, before the first test-flight of the real A-1 took place f.e.

    F-16 >>> AV 8 B >>> F-18 C

    in reply to: Bad news for the F-35 #2441478
    Dare2
    Participant

    Maybe, but 1200 kt is not 1290 kt as shown. Will you show us the graphic about the performance envelope?!

    NOPE. 😀

    Two reasons, first because the one i got is not all public, second in don’t want pple to mis-use it, it’s already a real bummer to post official datas from our mindef website, too much trouble, no thanks.

    in reply to: Bad news for the F-35 #2441486
    Dare2
    Participant

    Of cause it does. All Rafale F1 are phased out, because that can not be upgraded to F2 or even F3 standard

    FALSE. They will be upgraded. All of them. 😀

    there is no difference between F2 and F3 built, but a software upgrade only and no rework of the F2 in need. 😉

    True thopugh there have been some obsolescence sorted such as yet another generation of processors (MDPU).

    Just for the Gripen, Typhoon or the F-35 the empty equipped does go up in every Block or Tranche built, when using the same technology. :diablo:

    I dont know if it is the same really, because F-35 is still at systems design stage and these can increase the empty weight.

    For Typhoon it was also another issue, they decided to lower the International Maximum Structural Load standard from 1.5 to 1.4 and let the FCS take care of the rest to optimise its TWR.

    When they needed more airframe hours from increased structural stress due to its new “multirole” capabilties they had to rework it. Now new weight disclosed since.

    There is a reason why Dassault does quote a 10 tons class and not a 9 tons class any longer. 😎

    Only because thay have three different empty weight from three versions, so far as they did with the Mirage 2000, they have managed to keep the weight growth under control, first it is built liker a brick, then it has 1.8 tons of avionic volume which is enormous, much of it isn’t used (about 800 kg margin).

    For F-35 we still have to establish what these weight means but since it doesn’t have external pylons it is less relevant than an empty equiped configuration for another aircraft, the pylons are permanently in the bay.

    A typical AAM pylon is about 30 kg, stressed for 9.0 g+ and Mach 2.0.

    in reply to: South Africa scraps A400M deal. #2441489
    Dare2
    Participant

    http://www.defenseindustrydaily.com/images/AIR_A400M_Rollout_lg.jpg

    Source: South Africa to Cancel its A400M Order

    It’ still damned good looking aircraft, i’m furious with EADS to make such a mess of a presumably good project, this one was THE one not to mess about. 🙁

    OK we can accept targets unreachable and else but being overweight is something else expecially using the design packages they use today…

    Let’s hope it will recover and prove some of its qualities in service.

Viewing 15 posts - 331 through 345 (of 661 total)