Russia Defence Forum

Would you like to react to this message? Create an account in a few clicks or log in to continue.

Military Forum for Russian and Global Defence Issues


    Su-57 Stealth Fighter: News #7

    Hole
    Hole

    Posts : 4078
    Points : 4074
    Join date : 2018-03-24
    Age : 44
    Location : Merkelland

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Hole Fri Apr 23, 2021 8:59 pm

    Didn´t the boss of the Kronstadt company mention that the Su-57 could carry up to 8 Molnyas?
    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Sat Apr 24, 2021 2:01 am

    Sorry if reposts.  Just thought they were great pics worth sharing maybe even again.

    Su-57 Stealth Fighter: News #7 - Page 20 Ezr23sCXoAQyuzI?format=jpg&name=large

    Su-57 Stealth Fighter: News #7 - Page 20 Ezr0Jy0XsAI6ATC?format=jpg&name=large

    @LMFS you're right about the lack of flap usage on take offs. I think the Su-35S has the same ability and only the large and powerful horizontal stabilizers do the needed work which doesn't seem like much to get them airborn with those large wings AND wide body lift design,

    LMFS and Backman like this post

    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Sat Apr 24, 2021 4:43 am

    Hole wrote:Didn´t the boss of the Kronstadt company mention that the Su-57 could carry up to 8 Molnyas?

    I read that it could be carried by the Su-57, but I did not find them saying in what number

    Gomig-21 wrote:@LMFS you're right about the lack of flap usage on take offs. I think the Su-35S has the same ability and only the large and powerful horizontal stabilizers do the needed work which doesn't seem like much to get them airborn with those large wings AND wide body lift design,

    Good picks! Normally I've seen the Su-35 deploying flaps for takeoff, but maybe you have seen it doing it without them? The tails are used for the rotation, but in fact they detract from the plane's overall lift when used to pitch the nose up. If you realize, the deflection on the Su-57 is minimal (the plane has a high static instability) and sometimes, as peregrinefalcon proved us, the LEVCONS are used to pitch the nose up too. I am rather impressed by the ease with which the plane can take off, it is a proper STOL aircraft indeed.
    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Sun Apr 25, 2021 7:10 pm

    LMFS wrote:
    Good picks! Normally I've seen the Su-35 deploying flaps for takeoff, but maybe you have seen it doing it without them? The tails are used for the rotation, but in fact they detract from the plane's overall lift when used to pitch the nose up. If you realize, the deflection on the Su-57 is minimal (the plane has a high static instability) and sometimes, as peregrinefalcon proved us, the LEVCONS are used to pitch the nose up too. I am rather impressed by the ease with which the plane can take off, it is a proper STOL aircraft indeed.

    When you mentioned how the Su-57 seems to take off without the usage of flaps, it made me think if the Su-35S does as well since their building the (supposedly 30 aircraft for Egypt) and so most of my observations were of the Egyptian ones currently being tested and I believe that between 6 or 10 have already been delivered so I tool a look at a couple of the Egyptian ones and hardly any deflection of the flaps if any.

    Su-57 Stealth Fighter: News #7 - Page 20 Ank100778m-Su-35S-jet-fighter-of-the-Egyptian-Air-Force

    Then a couple of other Russian ones also, hence the assumption and I bet that because of the width of the body and wings that it probably doesn't need to use its flaps and just the H-stabs to push the back down and raise the nose and there it goes up in the air.

    Hard to see for sure but doesn't look like any flaps lowered.

    Su-57 Stealth Fighter: News #7 - Page 20 Russia-military-plane-736x443

    https://img.rt.com/files/news/1f/71/80/00/bourget-show-russian-exposition-.jpg

    Interesting phenomenon but I don't want to be the cause of being "bullocked" again! lol

    BTW, years ago I remember watching a video where a MiG collector was filming inside his cockpit prior to take off and he was meticulously going through the checklist and when he got to testing the stick movement of the moveable surfaces, he said you barely need to pull the stick back a few degrees for takeoff and need to be super careful because you go beyond that certain threshold, the plane will not only take off, it will do a back flip!  This was on a MiG-15!!  Those H-stabs really give the aircraft quite the pitch with minimal movement it seems.

    Finty likes this post

    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Sun Apr 25, 2021 8:40 pm

    @Gomig-21

    I don't think it is impossible for the Su-35 to take off without flaps, simply they seem to have established a certain deployment angle for the TO run and speed they apply. Nothing wrong in that, and it is the case normally for almost all planes, but as said, the Su-57 seems to be an exception, it only deploys them for landing. BTW the pictures you provide show a certain angle for the flaps as far as I can see.

    Gomig-21 likes this post

    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Sun Apr 25, 2021 8:50 pm

    LMFS wrote:@Gomig-21

    I don't think it is impossible for the Su-35 to take off without flaps, simply they seem to have established a certain deployment angle for the TO run and speed they apply. Nothing wrong in that, and it is the case normally for almost all planes, but as said, the Su-57 seems to be an exception, it only deploys them for landing. BTW the pictures you provide show a certain angle for the flaps as far as I can see.

    Yeah, it seems they're really marginal deflection, almost like they don't even need them. Such great aircraft. Hey imagine doing a backflip on takeoff in a MiG-25?!

    That also explains a lot of the cockpit videos we see of either the 35 or 57 and a rather minimal use of pulling that stick back. It doesn't take much.
    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Mon Apr 26, 2021 3:34 am

    I don't know if this video has been posted before, it contains fragments of an air battle between Su-57 and Su-35:

    Gomig-21, lancelot and Finty like this post

    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Mon Apr 26, 2021 12:08 pm

    From the 0:40 mark onwards there is a turn by both planes, it seems as if the Su-57 has a much faster onset. Maybe I am wanting to see too much in it, but it seems as if the instability of the plane allows it to pitch the nose and turn with the additionally won lift in a very immediate way, with almost no apparent deflection of the tail.
    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Fri Apr 30, 2021 3:16 am

    LMFS wrote:From the 0:40 mark onwards there is a turn by both planes, it seems as if the Su-57 has a much faster onset. Maybe I am wanting to see too much in it, but it seems as if the instability of the plane allows it to pitch the nose and turn with the additionally won lift in a very immediate way, with almost no apparent deflection of the tail.

    Probably the Su-35S pilot being cautious and taking a much more relaxed turn since he could easily turn into the Su-57 and cause a major collision.

    Need to see some new pics I haven't seen any come out lately.
    galicije83
    galicije83

    Posts : 47
    Points : 49
    Join date : 2015-04-30
    Age : 41
    Location : Novi Sad, Serbia

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  galicije83 Fri Apr 30, 2021 12:18 pm

    Pilot talking after flight:
    Right one: Do you used after burner in this vertical turn?
    Left one: i use it up.
    Right one: all the way?
    Left one: no, just when i was on top (probably meaning, top of the circle)
    Right one: very powerful!
    Left one: yes, it is....

    LMFS likes this post

    Atmosphere
    Atmosphere

    Posts : 40
    Points : 42
    Join date : 2021-01-31

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Atmosphere Fri Apr 30, 2021 2:36 pm

    Reminder that even with stage 1 engines , the thrust to weight ratio on the su-57 is still at the very least on par with any fifth gen and exceeding fourth gens.
    Of course while having that very long supersonic range.
    kvs
    kvs

    Posts : 9469
    Points : 9612
    Join date : 2014-09-11
    Location : Canuckistan

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  kvs Fri Apr 30, 2021 5:02 pm

    Atmosphere wrote:Reminder that even with stage 1 engines , the thrust to weight ratio on the su-57 is still at the very least on par with any fifth gen and exceeding fourth gens.
    Of course while having that very long supersonic range.

    According to Wikipedia the thrust to weight ratio is superior to the F-35:

    F-35:
    Thrust/weight: 0.87 at gross weight (1.07 at loaded weight with 50% internal fuel)

    Su-57:
    Thrust/weight:

    AL-41F1: 1.02 (1.19 at typical mission weight)
    izdeliye 30: 1.15–1.2 (1.36 at typical mission weight)
    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Fri Apr 30, 2021 5:05 pm

    The Su-35 has an estimated weight of ca. 18.5 t empty, and engines that produce 14.5 tf each. The Su-57 is "guesstimated" at 18-18.5 t weight empty and the engines produce 15 tf. Yet the pilots report a significant difference in acceleration and by the performance in airshows it indeed looks smaller and lighter. We don't have numbers, Sukhoi may surprise us with a plane lighter than expected, but in any case I agree the TWR seems pretty high already. People forget that the main reason for the izd. 30 is the supersonic cruising performance and not specifically TWR in max settings, though they will will most likely also grow.
    avatar
    gbu48098

    Posts : 177
    Points : 179
    Join date : 2021-04-18

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  gbu48098 Fri Apr 30, 2021 5:56 pm

    Gomig-21 wrote:
    When you mentioned how the Su-57 seems to take off without the usage of flaps, it made me think if the Su-35S does as well since their building the (supposedly 30 aircraft for Egypt) and so most of my observations were of the Egyptian ones currently being tested and I believe that between 6 or 10 have already been delivered so I tool a look at a couple of the Egyptian ones and hardly any deflection of the flaps if any.
    It also depends on the overall fuel load and other loads.....

    Gomig-21 likes this post

    avatar
    gbu48098

    Posts : 177
    Points : 179
    Join date : 2021-04-18

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  gbu48098 Fri Apr 30, 2021 6:01 pm

    kvs wrote:
    F-35:
    Thrust/weight: 0.87 at gross weight (1.07 at loaded weight with 50% internal fuel)

    Su-57:
    Thrust/weight:

       AL-41F1: 1.02 (1.19 at typical mission weight)
       izdeliye 30: 1.15–1.2 (1.36 at typical mission weight)
    F-35 engine is lot better just on specs
    Backman
    Backman

    Posts : 665
    Points : 673
    Join date : 2020-11-11

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Backman Fri Apr 30, 2021 6:10 pm

    LMFS wrote:The Su-35 has an estimated weight of ca. 18.5 t empty, and engines that produce 14.5 tf each. The Su-57 is "guesstimated" at 18-18.5 t weight empty and the engines produce 15 tf. Yet the pilots report a significant difference in acceleration and by the performance in airshows it indeed looks smaller and lighter. We don't have numbers, Sukhoi may surprise us with a plane lighter than expected, but in any case I agree the TWR seems pretty high already. People forget that the main reason for the izd. 30 is the supersonic cruising performance and not specifically TWR in max settings, though they will will most likely also grow.
    Too bad the take off length for the su 57 is classified. We know it's better than the su 35
    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Sat May 01, 2021 3:58 am

    LMFS wrote:I don't know if this video has been posted before, it contains fragments of an air battle between Su-57 and Su-35:


    BTW, notice from the first second to 0:14 is the first time EVER that I have seen the doors on those under-wing missile containers fully open.  Now I don't know if that is a mockup or a real Su-57, either way, we're getting there just thought I would let you know!
    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Sat May 01, 2021 5:25 am

    Backman wrote:Too bad the take off length for the su 57 is classified. We know it's better than the su 35

    Strelets talked about the landing distance of the Su-57 being half of that of the Su-35, but for the take off I have not seen any clear statement. What needs to be considered as said above is that it regularly takes off without flaps, that could be a very effective way of "sandbagging" the performance of the plane in its public appearances and hide the real minimum TO distance.

    Gomig-21 wrote:BTW, notice from the first second to 0:14 is the first time EVER that I have seen the doors on those under-wing missile containers fully open.  Now I don't know if that is a mockup or a real Su-57, either way, we're getting there just thought I would let you know!

    It is a weak 3D model, and I am not seeing any open bay door, just the panel being darker isn't it? Unless you are talking about the landing gear bay doors. In any case, the topic of the bays is a closed case as far as I can see, there is no half acceptable technical reasoning suggesting they cannot be what they are stated to be. We can question any technical data any manufacturer has not demonstrated, and that means essentially every useful parameter in modern planes.

    Backman likes this post

    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Tue May 04, 2021 5:05 am

    Su-57 Stealth Fighter: News #7 - Page 20 199210

    George1, Manov, Gomig-21 and Finty like this post

    Gomig-21
    Gomig-21

    Posts : 241
    Points : 243
    Join date : 2016-07-17
    Location : Boston USA

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Gomig-21 Tue May 04, 2021 10:08 pm

    LMFS wrote:It is a weak 3D model, and I am not seeing any open bay door, just the panel being darker isn't it? Unless you are talking about the landing gear bay doors. In any case, the topic of the bays is a closed case as far as I can see, there is no half acceptable technical reasoning suggesting they cannot be what they are stated to be. We can question any technical data any manufacturer has not demonstrated, and that means essentially every useful parameter in modern planes.

    You're right, the angle confused me a bit and it was just a few seconds it looked like those bay doors were open. The other point that made me notice it more is that door outline itself on the bay is colored differently, almost like a mirror panel to delineate it more and that made it appear to be open as well.

    Yeah I'm not questioning it anymore, I'm a believer just would like to see more of it in operation. In due time.

    LMFS likes this post

    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Thu May 06, 2021 12:26 am

    Su-57 Stealth Fighter: News #7 - Page 20 E0pYcURXsAQJusJ?format=jpg&name=large

    Gomig-21 and Backman like this post

    Backman
    Backman

    Posts : 665
    Points : 673
    Join date : 2020-11-11

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Backman Thu May 06, 2021 6:44 am

    There's a lot of banter going on about the missile bay at paralay. I think these are just ideas and possibilities going around.

    Su-57 Stealth Fighter: News #7 - Page 20 File

    Su-57 Stealth Fighter: News #7 - Page 20 JIEXLF7

    Backman
    Backman

    Posts : 665
    Points : 673
    Join date : 2020-11-11

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Backman Thu May 06, 2021 6:46 am

    The weapons bay capacity is not a closed case.

    Paralay quote
    The size of the compartment allows a lot, but the suspension scheme of the UVKU and its dimensions significantly reduce the ability to deploy medium-range missiles. In the future, this may change, it is stated that the internal suspension of the Su-57 may be up to eight UAVs (long 1.5 meters each)

    Su-57 Stealth Fighter: News #7 - Page 20 J3BUV1u


    Su-57 Stealth Fighter: News #7 - Page 20 161972161428116120
    avatar
    limb

    Posts : 165
    Points : 173
    Join date : 2020-09-17

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  limb Thu May 06, 2021 6:56 am

    Backman wrote:The weapons bay capacity is not a closed case.

    Paralay quote
    The size of the compartment allows a lot, but the suspension scheme of the UVKU and its dimensions significantly reduce the ability to deploy medium-range missiles. In the future, this may change, it is stated that the internal suspension of the Su-57 may be up to eight UAVs (long 1.5 meters each)

    Su-57 Stealth Fighter: News #7 - Page 20 J3BUV1u


    Su-57 Stealth Fighter: News #7 - Page 20 161972161428116120

    How could the Americans design a missile ejector in the 90s that could be small enough to stuff 6 amraams in the F-22s bay but the russians are incompetent enough to design an ejector that wastes so much space that only 2 R-77s can be stored per bay? This doesn't sound believable
    LMFS
    LMFS

    Posts : 3442
    Points : 3444
    Join date : 2018-03-03

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  LMFS Thu May 06, 2021 11:09 am

    The space is there, they just need foldable wings and double ejectors to get 4x MRAAM per bay.

    Sponsored content

    Su-57 Stealth Fighter: News #7 - Page 20 Empty Re: Su-57 Stealth Fighter: News #7

    Post  Sponsored content


      Current date/time is Sat May 08, 2021 2:28 am