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  • in reply to: F-35 News, Multimedia & Discussion thread (2) #2226190
    FBW
    Participant

    Yes, i know, i’m trying to guide you through this step by step

    A sustained turn IS the highest turn rate of an aircraft at a given altitude without energy loss. You continually make the same mistake regarding your understanding turn performance, yet attempt to be snarky. You interchangeably use agility and sustained turn rate as if they are the same. Guide yourself to a site that explains basic aircraft terms.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2226208
    FBW
    Participant

    Nah.. it doesnt need power to sustain a turn per see, but it need power to sustain a turn while retaining energy.
    The missile (lest its point blank) doesnt have this luxury, its going to drop energy in a losing game

    Look up Specific excess power, then look up sustained turn, then think about the first part of your statement- “sustain a turn while retaining energy”.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2226219
    FBW
    Participant

    Physics behind turn is same
    @Tu-22M work
    http://forum.keypublishing.com/showthread.php?123370-F-35-Debate-thread-(2)&p=2030179#post2030179

    I’m afraid missiles shot at any distance other than point blank is in an even more dire situation, as it doesnt even have thrust, so the only means of changing direction is with a couple of tiny wings with a load of a couple of tonne /m^2,
    and it goes without saying that won’t cut it.

    You consistently confuse a sustained turn with instantaneous turn. The aircraft needs sufficient SEP to SUSTAIN a turn. The aircraft can trade speed and or altitude to achieve a higher rate of turn. I feel this has been explained to you repeatedly.

    The typical missile, exempting cruise missiles etc, are balancing lift needed for endgame turn rate with drag robbing the missile of range/energy to turn. The AAM will use the massive amount of total energy available in terms of both altitude and KE to achieve a high degree of turn to intercept target.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2226284
    FBW
    Participant

    You mean to say missiles aren’t affected at 30k ft, as a fighter is, right ?

    Not sure what your point is here, clarify please.

    Aircraft and missiles don’t necessarily turn the same way. Aircraft- aircraft bank to turn, bank angle increases for degree of turn. Modern missiles can be skid to turn, TVC, control motor, or bank to turn. Lots aerodynamic lift is not desirable in a AAM. I’m not sure why you are making a comparison between a fighter and missile turning at altitude.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2226291
    FBW
    Participant

    @ Obligatory

    At high alt which is the only BVR alt, wing load very much dictate agility

    Its basically due to the fact air gets thinner at the altitude. In order to stay in level -let alone make a turn- an aircraft a) higher lift coefficient -OR- b) needs to go faster.

    What Andraxxus was describing was sustained turn performance. There are many different metrics of agility, many of which are not determined by wing loading. If you recall I posted about a dozen links of papers describing agility.

    http://forum.keypublishing.com/showthread.php?128845-What-metrics-of-Agility-and-Maneuverability-matter&p=2113513#post2113513

    Yes, low wing load improves sustained turn performance. In truth, at 30,000 feet even fighters with very low wingloading don’t sustain more than 3-4 g’s. As far as low wing loading being an indicator for BVR performance? Certainly a pilot would like to keep the P’s high when engaging especially with today’s fire and forget missiles. That ability to turn away while retaining energy would be one of the important traits for an air-superiority fighter. It does not improve the ability to “dodge” incoming missiles the way APA crowd likes to opine.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2226474
    FBW
    Participant

    The never-ending Canada saga:
    http://www.defensenews.com/article/20140406/DEFREG02/304060010/Canada-No-F-35-Buys-Before-2018

    P.S. obligatory for goodness sake will you stop posting the chart from a Boeing study from the 1990’s as proof of RCS and agility. That paper predates the JSF competition.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2227908
    FBW
    Participant

    I did FBW, but it was already posted 😉 Remember i dont only think/post bad news 😉

    It just came out yesterday. You are thinking of the GAO report card on F-35. The selected acquisition weapon report is different, covers all major DoD programs.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2227944
    FBW
    Participant

    In the midst of all these battles about GaN and whatnot, did anyone take the time to read the GAO report that I posted on the other page that discusses the status of GATOR and AMDR, as well as some interesting tidbits on the F-35? Or shall we continue with the “my nation’s GaN industry is bigger” argument?

    http://www.gao.gov/assets/670/662184.pdf

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2228234
    FBW
    Participant

    And with some good news, there is also bad. The first cut in the F-35 order?

    For example, the F-35 program requires $107 billion in future funding to cover cost growth, even though it will procure 409 fewer aircraft than originally planned.

    I wonder if this is a permanent reduction in the orders which the DoD was adamant would not happen.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2228247
    FBW
    Participant

    http://breakingdefense.com/2014/03/gaos-f-35-sar-estimate-plunges-11-5-billion-eelv-costs-soar-28-1-billion/

    Article is a bit vague, want to find the GAO annual assessment of selected weapons report. But apparently, 11.5 billion dollars has been shaved off cost of F-35 program by efficiencies.

    Got it:
    http://www.gao.gov/assets/670/662184.pdf

    in reply to: Mysterious plane over Texas #2229099
    FBW
    Participant

    wing sweep looks too extreme to be a B-2. Perhaps an prototype from the NGB program that is being flight tested for LRS-B requirement. Lockheed has several facilities in TX.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2229107
    FBW
    Participant

    One of the major hurtles to overcome with LO aircraft is heating. Both the F-22 and F-35 have pushed the limit on how much of the heat from avionics and aerodynamic heating can be dumped by the fuel system. You cannot simply add ram air cooling vents like other aircraft. This technological problem will limit both radar and the upgrades to defensive avionics suites for the near future.
    I believe I posted a DITC article about this a bit back, if not I will find it again.

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2229739
    FBW
    Participant

    More on F-35s to Farnborough, including an unusual target set. Reuters via Chicago Trib.

    [ATTACH=CONFIG]226683[/ATTACH]

    That’s one way to sell a plane, but do they need to denegrate those poor women with such offensive language? Reuters spell checker must have called in sick.

    in reply to: Saab Gripen & Gripen NG thread #3 #2229889
    FBW
    Participant

    Because it takes Gripen from ‘a nifty light fighter’ into the class of the F-16, i.e. the most successful fighter of the previous generation, and this at a time when there are no other contenders in the class and a fiscal and strategic environment that is highly favourable to such a platform. Gripen E/F is an elegant, modern, affordable solution for the 21st century, amidst a plethora of other programs that aren’t. It’s really that simple.

    The billion dollar question is: if your nation was not shouldering the development costs of the F-35, Rafale, etc. Would you still see it as a bargain? There are two NG demonstrators flying right now. If you are not a partner nation in the F-35 program and are looking at Unit cost circa. 2017-20, are you certain that the Gripen NG is your horse? For nonaligned nations the Gripen makes sense. The events in Ukraine just changed the paradigm, for better or worse depending if you own stock in L-M.

    As many posters have stated, fighter purchases are political. If your needs are air policing and sovereignty missions; Gripen NG makes a lot of sense. If you are buying an aircraft for a political coalition (i.e. Nato) would the NG be your first choice?

    in reply to: F-35 News, Multimedia & Discussion thread (2) #2229973
    FBW
    Participant

    They have been reporting this for quite some time. Not exactly unexpected, even if problematic. The Marines will most likely be impacted by this due to their upcoming IOC date. Both Pentagon and LM claim they will meet the deadline. Software has been a major bottleneck for both the F-22 and F-35 programs.
    here is the GAO report: http://www.gao.gov/assets/670/661842.pdf

    Reports from early this year:
    http://defensetech.org/2013/12/26/experts-to-study-f-35-software-delays/
    http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_01_23_2014_p0-657478.xml

    Edit- GAO target Unit cost 2019 F-35A 83.3 million, F-35B 108 million, F-35C 93.3 million (note states that unit cost reflects current planned procurement by U.S. and partner nations, changes in procurement will effect target cost)

Viewing 15 posts - 2,731 through 2,745 (of 2,935 total)