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  • in reply to: 2017 F-35 news and discussion thread #2174217
    mig-31bm
    Participant

    Nope, Mig-31….i’ve seen them both fly during the same afternnoon. 4 times.

    You are not the only one who watch them perform. There are loads of others who do as well, there are dozens of videos on youtube too. Unless there are side by side video comparision, it is nothing more than opinion which easily affected by personal agenda

    What i mean is that F-35 seem to need high AoA to generate it. Look at its angle when oit lands, for example

    CL curve is not a slope with constant angle from slow to high speed so it doesnt mean anything

    in reply to: 2017 F-35 news and discussion thread #2174497
    mig-31bm
    Participant

    µYes Mig 31 . struggle, even in your short “demo”. Imprecise, need high AoA to turn, pityful time to bank etc.

    Imprecise ? how do you define precise? any video for example ?
    and high AoA? it barely use any Aoa in that turn. Any video of Rafale roll faster than this ? 1:22

    Hae a look at Rafale, Typhoon demo…. World a difference. It is clean.

    I did ,saw no difference. So i will ask again. Do you have any side by side video comparison to show the alleged terribly unclean, imprecise, high AoA turning of F-35 compared to Rafale?. Without evidence it just opinions

    in reply to: 2017 F-35 news and discussion thread #2174590
    mig-31bm
    Participant

    small control surfaces.permanently struggling where eurocanards or others look to be on a rail

    Struggle? any side by side for comparison?

    The tail stabilators are nearly the size of F-16 wings

    in reply to: 2017 F-35 news and discussion thread #2174632
    mig-31bm
    Participant

    So what move did it do that a delta-duck couldn’t? I’m not asking for a friend since I saw the Paris demo in person.

    High AoA nose pointing, specifically the pedal turn
    https://i.imgur.com/diKVg69.gif

    in reply to: 2017 F-35 news and discussion thread #2175204
    mig-31bm
    Participant

    Again it is more subtle than that. In some case yes, the intention was delibarate to reach AoA to showcase F35 abilities in that particular domain but in other instances you could easily see this was rather a constraint.

    When post stall maneuver is not needed, it accelerates super quick

    http://forum.keypublishing.com/attachment.php?attachmentid=254279&d=149…

    They have different wing profiles withcontrol laws.
    F-16 flies at low speed with leading edge flaps/ trailing edge flaps down. Leading edge flaps increase camber, wing AoA increases with leading/trailing edge flaps lowered.
    Look at the leading and trailing edge flaps horizontal stab positions on the F-35 flying at slow speed compared to the f-16. F-35 flies decidedly nose up, trailing and leading edge flaps at a lower angle.
    Horizontal stab providing lift.In this aspect, F-22 is similar

    https://pbs.twimg.com/media/CyJMdQeUUAA1T4W.jpg

    https://s18.postimg.org/prsj77kh5/kpoh6_Ef.jpg

    in reply to: 2017 F-35 news and discussion thread #2176303
    mig-31bm
    Participant

    The F35 reaches AoA when most other fighter jets without internal bays (and with a smaller fuel fraction) would fly normaly at reasonnable AoA and therefore retaining energy. it was constrained to go in AoA to match other 4th jet maneuvrability

    Wrong, it reached high AoA because the pilot wanted to do a post stall display. Those nose pointing are not possible at normal AoA, high speed regardless of what aircraft you talking about. Secondly, the nose pointing rate are much faster than normal turn rate, the trade off is that aircraft must dump speed.

    in reply to: 2017 F-35 news and discussion thread #2176493
    mig-31bm
    Participant

    In comparison the rafale display felt more dynamic and energic in this regard as there was always someting happening with cleaner trajectories and maneuvres overall.

    Because Rafale doesn’t do nose pointing high AoA maneuver

    in reply to: 2017 F-35 news and discussion thread #2177330
    mig-31bm
    Participant

    @haavarla

    The F-35 have also a “soft” limit AoA.
    I don’t know what that is or how the flight Control System works. But if you fly at Mach 0.7 and pull hard back on the flightstick, if its slaved for a 50 AoA.. you wreck the jet.
    Its locked at 7G and 9G, so the AoA is pretty dynamical but at the same time confined as to your airspeed.

    Why do you keep talking about high AoA at high air speed while the point is clearly about nose authority at high AoA, low speed?

    Flynn says. “You maneuver the airplane back and forth with amazing controllability at the highest degree of angle-of-attack, and that is not the case with the only other Western airplane that can go to high AOA, the F/A-18.” The one other exception is the Raptor, which Flynn does acknowledge as having better high AOA performance than the F-35 due to its thrust vectoring capability. The Typhoon, by comparison, has a 25° AOA limit. In the F-35, Lockheed made the decision to limit the AOA to 50°, but test pilots have flown the aircraft well past that.

    @haavarla

    And while the Anti-Russian crowd have been screaming “speed is life”.. kind of strange that it suddenly has ceased to be..?

    For cannon dogfight, speed is still very important, post stall is only a part of the envelope, but F-35 isn’t inferior in this aspect either as its subsonic acceleration is even better than Su-35, F-16.

    in reply to: 2017 F-35 news and discussion thread #2178980
    mig-31bm
    Participant

    How hard is it to understand that the G and Alpha limiter on Mig-29A was not dictated by any aerodynamical limitation but by its simplistic Flight Control System design.

    The Mig-29 was planed and deviced as a far cheaper and less sophisticated jet over its larger, more expensive and complex Su-27.

    So the nonsens that the Mig-29 was had poor nose autority is pure garbage!
    It seems i have to do this one more time.. let me be more presise. The G/Alpha limiter function was not to damage the jet, when it operated above Corner speed, IMO flying up the Mach Number.
    But when it slowed down below Mach 0.4, it was easy to disengage the alpha limiter and here is all the tales about Mig-29 nose pointing autority being told by countless people, including F-16 pilots whom flew against it.

    Su-27 has FBW but still have the same 26° AoA limit, i don’t deny that they can both excess that limit but that doesn’t necessarily mean they are very controllable at that point. Take the F-18E as example:

    In terms of high angle of attack (AOA) performance, Flynn says the F-35 is better than the Boeing F/A-18E/F, even though the Super Hornet is capable of reaching higher angles than the JSF’s limit of 50°. “We are better than any airplane out there,” says Flynn, a veteran Canadian Forces CF-18 Hornet pilot who has also flown thrust-vectored prototype variants of the F-16 and F/A-18 Hornet at NASA. “You can go to higher degrees of angle-of-attack in the F/A-18, the flight control system will not limit you, but that’s not necessarily controlled flight.” In the F/A-18, Flynn says that past 50° there is a lot of very violent buffeting.

    Flynn says. “You maneuver the airplane back and forth with amazing controllability at the highest degree of angle-of-attack, and that is not the case with the only other Western airplane that can go to high AOA, the F/A-18.” The one other exception is the Raptor, which Flynn does acknowledge as having better high AOA performance than the F-35 due to its thrust vectoring capability. The Typhoon, by comparison, has a 25° AOA limit. In the F-35, Lockheed made the decision to limit the AOA to 50°, but test pilots have flown the aircraft well past that.

    The high AOA limit gives the F-35 “great” instantaneous turn performance. “We knew that 50°, from our years of research, is about as far as you need to go to take advantage of the aerodynamic performance” of the jet, Flynn says. “There is no reason to be there [at extreme AOA]; you’re not going to get much more capability at 75° than you would at 50°.” The limiter will allow an F-35 pilot to fly with “reckless abandon”, which Flynn says is not possible in a Hornet because an F/A-18 can depart from controlled flight.

    in reply to: 2017 F-35 news and discussion thread #2179362
    mig-31bm
    Participant

    When someone write
    the more, the less
    and
    from Mig-29A onward
    one should understand that the point is about a continuing trend, not about the performance of just one plane or even better to the initial full scale version of it.
    That’s however if he is really there to discuss and not just for making chauvinistic remarks or keep on taking part to some sort of male reproductive organ measurement contest.
    So, from the introduction of the MiG-29A and the Su-27 there has been a constant effort to expand the flight envelope of fighters planes in all directions but above all in the direction of noise pointing , high AoA and slow speed handling.

    That not the same as your original post. You said F-35 has many great capabilities of US fighters combined but the rest of the world enjoyed the same capabilities from Mig-29A onwards. That is like saying PAK-FA has good high speed performance but the US already enjoyed similar capabilities from F-15A onwards

    This kind of performances are what are called 4,5 generation in Western Europe and 4 generation+ and now even ++ in Russian, marking with those terms a difference with the previous 4 gen ones that instead was centered more on horizontal turning.

    High alpha nose authority isn’t what defines the differences between 4 generation and 4.5 generation fighter. Mig-29OVT has great nose pointing due to 3d tvc but generally not considered 4.5 gen, whereas Typhoon doesn’t have great high AoA nose pointing but generally considered 4.5 gen

    in reply to: 2017 F-35 news and discussion thread #2179728
    mig-31bm
    Participant

    MiG-29A (9-12) service AoA limit is 26 degrees, however in the past Luftwaffe pilots and more recently Bulgarian AF pilots do exceed AoA limits during BFM exercises.

    Yes aoa limit can be exceed, just like G limit. But aoa limit shows control authority limits

    MiG-29M and K versions had AoA limits increased to 30-35 degrees.

    Source?

    in reply to: 2017 F-35 news and discussion thread #2180175
    mig-31bm
    Participant

    What is this nonsens about Mig-29 AoA limit??
    Haven’t you guys learned this by now!

    So again, its about Corner speed COMBINED with AoA limit.
    When a Mig fly slower, like at Airshow slow, the jet can do much more than 26deg.

    Again.. there is a big difference in Mach 0.9 and 0.4
    Mig-29 like Su-27 thrives in the Mach 0.4 loop.

    And i can promise you that F-35 can’t do 50 AoA at Mach 0.9!

    No one say F-35 can do 50 AoA at Mach 0.9, we are all talking about AoA limit while aircraft still have nose authority at slow speed, as far as testimony go, Mig-29 AoA limit is at 26 degrees,nose authority of mig-29 isn’t good after that limiter aren’t there for fun

    And that was the Mig-29 9.12 version which happen to be quite long in the thooth and is almost gone from VKS Inventory.
    Newer Mig-29 with full Digital FBW does not have such AoA limit at all. So your point becomes quite moot.

    Source? apart from Mig-29OVT with thrust vector control, i haven’t read about different AoA limit in new versions

    in reply to: 2017 F-35 news and discussion thread #2180523
    mig-31bm
    Participant

    @Marcellogo

    The one about the 26° degree limiter however made me raise a few questions about the selective use you sometime made of your sources
    as is a fact widely know by decades that the Mig-29A can switch off it a will and their pilots were expected to do so immediately when in combat.

    F-35 AoA limit is at 50, Mig-29 AoA limit is at 26. It shows that F-35 has much better high AoA control authority. Example: F-16 has g-limit of 9g, F-18 has g-limit of 7g, can overdrive to 9g but we don’t say they have same high g performance

    in reply to: 2017 F-35 news and discussion thread #2181017
    mig-31bm
    Participant

    @Marcellogo

    Out of jokes I think it’s a question about the starting point from what you consider the thing.
    Certainly the possibility of having a plane able to roll as an F-16 in horizontal, having the instantaneous pitch and AOA of a F/A-18 and a F-15 like acceleration and vertical climb capabilities is really a great improvement on an US legacy plane pilot’s perspective.
    The slow speed handling capabilities is also something absolutely new for them , so I can understand the enthusiastic tone used.

    For the rest of the world, it’s instead the more, the less all what we got from MiG-29A onward (flight performance wise only, obviously) so a cooler head is just in the order of things…

    F-18 has very good low speed handling and nose authority so that is not something new for US pilot and Mig-29 have AoA limiter at 26 degrees so its nose pointing will be no where close to F-35, with 2 engines mig-29 will likely has interior roll rate too. Finally, Mig-29 cannot pull more than 7.5G with full fuel

    The MiG-29 flight control system also has an AoA limiter that limits the allowable AoA to 26°. As the aircraft reaches the limit, pistons at the base of the stick push the stick forward and reduce the AoA about 5°. The pilot has to fight the flight controls to hold the jet at 26°. The limiter can be overridden, however, with about 17 kg more back pressure on the stick. While not entirely unsafe and at times tactically useful, care must be taken not to attempt to roll the aircraft with ailerons when above 26° AoA. In this case it is best to control roll with the rudders due to adverse yaw caused by the ailerons at high AoA. The F-16 is electronically limited to 26° AoA. While the pilot cannot manually override this limit it is possible to overshoot under certain conditions and risk departure from controlled flight. This is a disadvantage to the F-16 but is a safety margin due its lack of longitudinal stability. Both aircraft have a lift limit of approximately
    35° AoA.

    in reply to: USAF not F-35 thread #2186065
    mig-31bm
    Participant

    The ambitious F-35 project from Lockheed Martin and the Pentagon seems to have stalled!!! What is the way out now? What Happened to F-35 Project from Lockheed Martin?

    1/ This is not an F-35 thread, read the title
    2/ Do some research next time before writing.

Viewing 15 posts - 181 through 195 (of 1,759 total)