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jackjack

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  • in reply to: An alternative to the F-35 #2401899
    jackjack
    Participant

    I think it’s a matter of doctrine, the european companies are busy with UCAV’s for strike, and seemingly intend to have 4.5 manned fighters for defence.

    and you dont see the hole in your logic, do you
    i would like to see the white paper that you formed your conclusions on

    in reply to: An alternative to the F-35 #2401901
    jackjack
    Participant

    yep, i wonder why all the major nations of the world are busting their buts to get VLO/stealth in one form or another ?
    if only they knew what you know

    in reply to: F-35 news thread II #2401935
    jackjack
    Participant

    What he is trying to say is that it fulfills the same function as a VG intake, namely, supply the air to the engine at a velocity of around 0.4-0.5Mn under all conditions with the minimum of losses. It just does it without all those heavy and expensive to make movey bits, that also cost alot more in maintenance during the a/c’s lifetime.

    thats right and the f-35 guys arent trying to say any different to that
    it controls supersonic boundary layer to m2
    no one has said that the f-35 does m2

    in reply to: F-35 news thread II #2402894
    jackjack
    Participant

    no, its the DSI
    the DSI will but the f-35 wont go m2

    in reply to: F-35 news thread II #2402944
    jackjack
    Participant

    no i think you are missing the point,
    the dsi works to m2, there is no tuning of that supersonic boundary layer control for any specific speed by the dsi
    even if the f-35 had a max of 1.4, the dsi design would control supersonic upto m2, it makes no difference

    other tuning/design of the intake and engine would be for subsonic, transonic and supersonic required performance and most focus is in the subsonic & transonic region, as i see it

    in reply to: F-35 news thread II #2402960
    jackjack
    Participant

    so what, who is making the claim that it did ?
    the f-35 guys are saying the divertless inlet is tested up to m2, which you own link showed

    in reply to: F-35 news thread II #2402971
    jackjack
    Participant

    Actually, Sens is right and this is only partially true and as usual you’re omitting crucial factors.
    First of, F16 being able to fly M2 with JSF’s inlet doesn’t mean absolutely anything, due different engine and duct length/volume.
    True, inlet’s bump is used as a pressure generator, but isn’t “speed optimized” and at some point chokes, thus adding to the overall drag and eventually limiting plane’s speed.
    So, if JSF’s speed KPP was M1.6, it’s very unlikely that LM’s engineers built it’s intakes for M2, since that would be wasting of resources (intake’s volume and front area), which could (and probably are) better spent on extra fuel, weapon bays, or some similar part of the aircraft.
    This is a common mistake when assessing some plane’s capability, since those are built around KPPs, not frivolously.
    It’s funny watching certain ppl claiming that an air force is still “discovering” some type’s abilities, even 15 years after the model took off.
    That, of course, are stories for children and vast majority of plane’s abilities are known before the prototype has been built.

    So, to clear the statement you’ve posted…the JSF’s inlet bump does all that, BUT in an F16/F1X0, which is by no means true for JSF, or some other plane for that matter.

    it is a simple statement that the divertless intake controls supersonic boundary layer up to m2.0, not that the f-35 will do m2.0 max

    in reply to: F-35 news thread II #2403003
    jackjack
    Participant

    over G
    as i have said it is doubfull our RAAF will ever run the f-35 at max
    you can count the times the f-15 even exceeded 1.2 in combat on one hand [links have been posted]
    its the neysayers that say the f-35 ‘cant’ do more than 1.6 that are being silly, it isnt the divertless intake which is their claim

    in reply to: F-35 news thread II #2403015
    jackjack
    Participant

    Let’s remember that Boeing went with a variable inlet for the x-32, and Lockheed went with this diverted inlet thingy (a nice/cool name -so typical in the US industry- for a faired FIXED inlet optimized for certain speed) after their experiences with the magical plasma-coil-alien F22’s inlets….:D

    not only the b2, f-22, there is a reason we call our f-35 “Sparky” 😎
    read their publications on electrostatic (plasma) control of inlet and exhaust flow
    http://www.mecheng.osu.edu/gdtl/

    in reply to: F-35 news thread II #2403028
    jackjack
    Participant

    They did so in the 90s if it works really. The Cengdu FC-1 got it too.
    The real testing behind the Wind Tunnel was in need to find out if it avoids disortions and allows carefree behavior without that.
    The first flight of the X-35A was in October 2000 and in 2001 the F-35 was selected.

    Copied from JonS and of intrest in Bold marked by me.
    #13
    27th May 2005, 20:03
    JonS
    Rank 5 Registered User

    Join Date: Jul 2004
    Posts: 760

    taken from a earliar topic on FC-1

    The overall inlet design, called a diverterless supersonic inlet or DSI, moved from concept to reality when it was installed and flown on a Block 30 F-16 in a highly successful demonstration program.

    The new inlet showed slightly better subsonic specific excess power than a production inlet and that verified the overall system benefits of eliminating the diverter. Test pilots remarked that military power settings and thrust characteristics were very similar to standard production F-16 aircraft with the same General Electric F110-GE-129 engine. Considering the overall goal of the flight test program was to demonstrate the viability of this advanced inlet technology, the results were excellent.

    The DSI bump functions as a compression surface and creates a pressure distribution that prevents the majority of the boundary layer air from entering the inlet at speeds up to Mach 2. In essence, the DSI does away with complex and heavy mechanical systems.

    The DSI concept was introduced into the JAST/JSF program as a trade study item in mid-1994. It was compared with a traditional “caret” style inlet. The trade studies involved additional CFD, testing, and weight and cost analyses. The new inlet earned its way into the JSF design after proving to be thirty percent lighter and showing lower production and maintenance costs over traditional inlets while still meeting all performance requirements.

    you just shot yourself again.
    you didnt highlight this bit :diablo:

    The DSI bump functions as a compression surface and creates a pressure distribution that prevents the majority of the boundary layer air from entering the inlet at speeds up to Mach 2.

    in reply to: F-35 news thread II #2403493
    jackjack
    Participant

    my contribution was that i knew sens was mistaken and i was suggesting to sens to look up about the ‘detailed’ testing that was done for the f-35 inlet design, the website’s can explain it much better than i could
    he seemed to dismiss this idea with a ‘have you ?’
    given that this has been talked about on numerous threads here and where sens and i have participated in, he wouldnt take people saying it was tested as correct this time either

    it is obvious that i have or i wouldnt know that the detailed information is available, there is even pictures of both sides of the f-35 intake joined together in the testing
    http://en.wikipedia.org/wiki/File:F-35_Divertless_Supersonic_Inlet_F-16.jpg
    http://en.wikipedia.org/wiki/File:F-35_Divertless_Supersonic_Inlet_F-16.jpg

    in reply to: F-35 news thread II #2403555
    jackjack
    Participant

    first it was silly assumptions, now its silly questions

    in reply to: F-35 news thread II #2403794
    jackjack
    Participant

    i think you should google the f-16 intake tests for the f-35, instead of makings silly assumptions

    in reply to: F-35 news thread II #2405024
    jackjack
    Participant

    djcross, because so many nations are using the f-35 and there isnt really a tactical use for the max speed, same for the 2.5 of the f-111 and the f-15
    it will probably be released
    they have relesed the test flight of the early f-35 that exceeded the 1.6 to 1.67, although it wasnt claimed as that was as fast as it could go, just to keep the fanboys guessing

    in reply to: F-35 news thread II #2405028
    jackjack
    Participant

    Your answer to yourself matches Rationalization (psychology)

    In psychology and logic, rationalization (or making excuses[1]) is the process of constructing a logical justification for a belief, decision, action or lack thereof that was originally arrived at through a different mental process. It is a defense mechanism in which perceived controversial behaviors or feelings are explained in a rational or logical manner to avoid the true explanation, to differentiate from the original deterministic explanation, of the behavior or feeling in question.[2][3] It is also an informal fallacy of reasoning.

    http://en.wikipedia.org/wiki/Rationalization_%28psychology%29

    so you think that our RAAF probably wont ever use the f-35 top speed is rationalisation ?
    http://www.smileys-gratuits.fr/Smile/Rires/mdr-mort-de-rire-284923.gif
    while you’re using big words, look up sublimation, its what eurocanard fanboys do when looking at the f-35 capability

    1.6 is what they decided they needed, if they wanted 2.0, that would have been the max in the specs
    if it now does more, so be it but it isnt a requirement
    and if the acceleration thrust improvement in blk 5-6 gives more top speed, so be it
    but again its only the fanboys who will care

    the f-35 a,b,c all have a max speed of 1.6, yet 2 have quite different weights, wings and fuselage
    the f-35a being the better for max speed
    what are they going to do ?
    restrict the f135 the slow the f-35a down to 1.6 ?

    if they can do that without reducing acceleration, i wouldnt care

    fanboys are funny

Viewing 15 posts - 391 through 405 (of 1,733 total)