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Viewing 15 posts - 1,291 through 1,305 (of 2,935 total)
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  • in reply to: F-35 News and discussion (2016) take III #2138530
    FBW
    Participant

    Congress Wants A-10 vs. F-35 Flyoff

    https://t.co/JM5pJTbusf

    Been saying that for two years. McSally can’t leave her A-10 days behind her. Will be interesting if A-10 found to be less effective. Maybe then that vociferous base will be placated.

    If the USAF budget wasn’t so tight, it would make sense to keep a few A-10 squadrons in the ANG. That is not reality: JSTARS recap, KC-46, B-21,F-35.

    in reply to: Indian Air Force Thread 20 #2138741
    FBW
    Participant

    Livefist has some interesting updates on F-16 block 70, Advanced S. Hornet proposals:
    http://www.livefistdefence.com/2016/11/revealed-lockheed-martins-3-point-f-16-pitch-to-india.html

    in reply to: Canadian Fighter Replacement #2138789
    FBW
    Participant

    WP, can u move question to “supercruise” thread? Let’s get this one back on topic.

    in reply to: Supercruise #2138841
    FBW
    Participant

    Transonic region- Straight wing
    [ATTACH=CONFIG]250029[/ATTACH]

    Swept wing will have lower overall wing wave drag- delay of drag rise:
    [ATTACH=CONFIG]250030[/ATTACH]

    Supersonic Vs Subsonic drag:
    [ATTACH=CONFIG]250031[/ATTACH]

    Note- While wing wave drag will be delayed and lower with a swept wing (and that is the largest contributor to wave drag), drag coefficient will still be much higher in the transonic. Beyond mach 1.2 Cd is relatively constant for most aircraft ( though drag will increase with speed)

    in reply to: LRS-B #2138903
    FBW
    Participant

    Interesting 2008 study of the availability TRL needed to build the then “2018 bomber”. Gives a good indication why LRS-B has been able to move forward relatively quickly:
    http://lexingtoninstitute.org/wp-content/uploads/technology-readiness.pdf

    Should probably rename this thread B-21 now.

    in reply to: Canadian Fighter Replacement #2138946
    FBW
    Participant

    Starting a separate thread on this. Let’s make the Canadian fighter replacement topics somewhat relevant to topic.

    in reply to: Canadian Fighter Replacement #2139000
    FBW
    Participant

    I believe Riccioni, of the “fighter mafia” fame was the first to use the term (though I have no faith that he actually “coined” the term).

    The argument is one of semantics vs. fluid dynamics. Is supercruise simply flying above mach 1 without afterburners? Or is when the aircraft is flying in fully supersonic airflow on dry thrust?

    in reply to: Canadian Fighter Replacement #2139017
    FBW
    Participant

    wrong
    USAF required the F-22 to supercruise at M1.5, alright, but that never changed the definition of supercruise as such. It simply gave a requirement of speed to be fulfilled
    ?

    Nope, came out the ATF requirements (Mach 1.4-1.5). For good reason. Depending on aircraft, transonic drag can still be high at Mach 1.2. The ATF was supposed to be able to fly combat portion of mission supercruising. Obviously that would be difficult if the aircraft could only maintain supercruise in straight and level.

    in reply to: Canadian Fighter Replacement #2139049
    FBW
    Participant

    in any case, the definition of supercruise is “supersonic flight on dry thrust”… after the F-22 came out, PR team from LM (and the fanboys immediately after) stated that the F-22 was the only fighter to supercruise as SC meant beyond M1.5 (basically, the claim made simply to brag how unique the F-22 was

    Actually, no. There were good reasons for the USAF to set the KPP for the F-22 supercruise requirement at Mach 1.5+. As for the rest, define supercruise however you want.

    in reply to: Canadian Fighter Replacement #2139055
    FBW
    Participant

    supercruise is defined as sustained supersonic speed in level flight on dry thrust,

    who use it as he see fit ?

    Literally everyone who has been on here for the last 4-5 years knows your views on this. Does this need to be rehashed every 3 months?

    No one but the marketing teams care whether one aircraft can “technically” fly at Mach .98, 1.01, or 1.2 on dry thrust. Because a simple 10 minute foray of reading on transonic region would understand why it’s worthless.

    in reply to: Russia moving tac air troops to Syria #2139206
    FBW
    Participant

    Next time, restrain from taking my name into your mouth.. when I am accidentally interested in what you think, I will ask..
    thank you..

    With Msphere on this…. last time I checked, there was no poster of the year award. Everyone’s opinion of credible is their own. And Lukos/starfish may have had an engineering degree, but quite often he was full of *

    in reply to: Canadian Fighter Replacement #2139363
    FBW
    Participant

    Rafale F2 standard had a 200 Mb/s databus called STI in 2003 (inside the EMTI between cards). I don’t know what is the datarate transfer of F3 (and evolutions). I also highly doubt, considering SAAB skills in calculators (finely working for Ariane rockets for example) that databus would be limiting.

    France uses their own standard. Haven’t looked into it. The only aircraft I know that definitely employs “FireWire” equivalent is the F-35 connecting ICP, sensors. (400 mb/s as reported in 2004).

    in reply to: Canadian Fighter Replacement #2139496
    FBW
    Participant

    Thanks, I did not see those (seems my searching skills were not very strong).

    Anyway it still seems to me that this could be on par with Rafale technology — I am no expert on data transfer technology but “high speed ethernet” sounds pretty good to me?

    But yeah, definitely not in the same league as F-35 (which is what I already stated above).

    When was the twitter image published? I notice it says 8 1553B data buses whereas the other image you refer to seems to list only 4?

    Probably on par with most everything flying. There are 4 on each TMC, redundancy?

    in reply to: Canadian Fighter Replacement #2139525
    FBW
    Participant

    Ahem, what makes you think Gripen E will have the same data bus as the Gripen C?

    I have tried to find info on which databus they will be using, so far I did not find anything very specific, other than statements about “ultra-fast data bus” and statements about “improved data bus structure” — this together with hints dropped by various Saab employees indicate that Gripen E will have state-of-the-art data bus structure.

    Also the software will be significantly upgraded — after all they are shifting the first flight by 6 months to fully qualify the software first. That would not have been necessary had it been only a minor software upgrade.
    .

    Ahem, the system architecture was outline long before. The Gripen C added the new TMC in 2010, you obviously didn’t look very hard. Now look what is connected to the Tactical mission computers; see the 1553B databuses? Not state of the art, sorry:
    http://www.gripenblogs.com/Lists/Posts/Post.aspx?ID=408
    [ATTACH=CONFIG]250002[/ATTACH]

    Again, twitter release: https://pbs.twimg.com/media/Byg54m8IEAAJMXk.jpg

    Considering that databus standard is used on nearly every aircraft flying (with the exception of the F-35, and possibly the F-22 as they were to be the first with new standard IEEE 1394 theoretical gb/s transfer rate), it is not a limiting factor as of now. However, the aircraft is expected to serve for 35-40 years.

    in reply to: Canadian Fighter Replacement #2139540
    FBW
    Participant

    i’ve begun researching F-35 combat radius

    eliminating the buffer adds ~39 nm so 620 nm combat radius, excluding on station time until specified,
    no payload specified
    if true, after equalize for on station time, that puts gripen E well over 300 nm CAP advantage over F-35
    .

    What your about post shows is that you now need to do a considerable amount of researching on:
    1. The F-35 mission profile
    2. what range on that profile the current estimates are ( and why they changed from previous 584 nmi)
    3. The difference between the L-M slide showing AtA range and the USAF profile used for combat radius KPP.
    4. evidence to support your claim that the F-35 AtA combat radius does not include time on station (especially considering the 2008 doc specifically stated 1 minute of combat, and that was an early, heavy configuration of the F-35), range estimates have only improved.

Viewing 15 posts - 1,291 through 1,305 (of 2,935 total)