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Viewing 15 posts - 556 through 570 (of 1,640 total)
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  • in reply to: 787 vs A400m #2439845
    over G
    Participant

    What problems these both planes are facing?

    I understand both have issues with their composite structures, but i would like to know specifically where, the wing, the fuselage?, the skin the structure? for both cases.

    The A400 has that resonance control thingy, which i don’t understand very well, can somebody explain me better?

    in reply to: Bad news for the F-35 #2440429
    over G
    Participant

    😉

    Sustained turn is actually more important than instantaneous turning, because air combat is not just a dramatic top gun scene.

    The interception phase is more important than the dogfight itself, the capability for the interceptors to enter in a merge with enough height/speed advantage is actually the most important factor in a combat.

    Under the interception phase (on whichever plane, F15/16/35 etc..) the plane won’t waste height and speed persecuting the target, because if they do that they will never meet their target, or they will enter into the merge under bad conditions.

    Performance wise both are in the same class in general, when related to the avionics and weaponary the US-fighter has still the edge.

    Numbers were and still are the main factor for a successful air campaign, how many planes you have?, how many missiles you have up there?, how many missiles can you launch?, Numbers, not the fancy mythical uber radars and the uber “slammer” missile myth…such fancy tales about “superradars” (like the over-hyping over AESA) or “super missiles” (like the “slammer” :rolleyes:) have been repeated since ever, when the main critical factor was always to outnumber the enemy.

    For nowdays technology fighters can’t been command centers, no matter how “netcentric’d” are them, net centric capabilities are ok, but the main advantage is that the information goes to the command outposts, for confirmation or to gather new information, pilots don’t take decisions, they are just vectors with missiles

    The real deal with net centric capabilities is that each fighter does not need very big transmission systems to make the information to reach the command outposts, since the information jumps from fighter to fighter to reach until it reach the command outpost.

    If you are imaging a single pilot in a gripen directing an interception, you got a very wrong picture of the reality

    ***********************

    Regarding the sustained turn of the F22, you guys should check some videos, i’m not sure if the plane is actually doing 9 gs, you actually can get higher turn rates at 5-4 gs and at lower speed, all the Raptor’s videos are at very low speed, most likely below M0.5, yes you can reach higher turn rate at such speed and at lower g-loads

    in reply to: Bad news for the F-35 #2441629
    over G
    Participant

    Correction: Yes seems the 35A is a bit worse than the 16A, even at 15000fts, problem is that i did take 15000fts as 5000m, i don’t have the 16C diagrams, though

    Anyway, i think there is a lot of bashing on that program, the program has not finished yet, there is no point to bash a plane that is still under development

    in reply to: Bad news for the F-35 #2441651
    over G
    Participant

    Well, i’m talking about the 16A, not the 16/79

    Edit, ahhh haha, okok, check better the graphic, :), is 1500m – 9gs, and 5000m at 5gs, check it better

    The 16a 5g envelopment is worse, although the 9gs one is much better if i recall correctly

    Hint: The 9gs envelopment is pretty small

    in reply to: Bad news for the F-35 #2441658
    over G
    Participant

    and a sustained turn capability of 4.95g at Mach 0.8 and 15,000 ft.

    This is basically the same performance of the f16, cola, is the mig-29/su-27/F-15A the ones turning 7gs at 3000-5000m, sustained.

    The falcon’s height performance is not that great, but i think the F22’s height performance won’t be as well, since both have similar performances, if you compare the 3g’s sustained turning of the Raptor with te f16’s 3 g’s at 10000m and the F-35 5g’s at 5000m, i think all three, F22/35/16 have the same sustained turning capability

    I mean how stupid can you be?

    Can we avoid such comments like this one?

    in reply to: Saab JAS 39 Gripen Info # 2 #2442305
    over G
    Participant

    Slanted AESA installations have nothing to do with LO, but inherently low gain and processing of signals coming from off-bore angles.
    Swashplate design is conceived as an attempt to remedy this shortcoming and give AESA constant azimuth/elevation coverage, something so far being privilege of MSA systems, only.
    Therefore, Swashplate AESA layout is a next step in AESA type radar development, indeed.

    Can you elaborate a bit more on that?, i’m not a radar expert, but i have been told that the slanted array is to keep the contact over the target on maneuvers, much like the typical IRST placement, also russians have said this for their canted aesas (at least for the pazotron case), i trust them better than all the stealth yadadada on most popular sources.

    The gain/off-bore performances could be true as well, but i would like to know from where you are taking this argument

    For the gripen’s case i would assume the weight of the array is too heavy to be fit into a conventional multi-axis mount, and instead to slant the array and rotate it.

    in reply to: Can the Mitsubishi F-2 be exported? #2444201
    over G
    Participant

    he Japanese F-4EJ had no look-down radar in 1976 and were unable to pick up the low level MiG-25 in the ground-clutter.

    Yes most likely the F4 look down capability was not good,

    But for sure you think air control only depends on fighters, or actually fighters have early warning capability, and they are not actually directed from command outposts or radar outposts…of course, such thing was only done by the soviets…

    hint: with the same command system, even a F22 had not intercepted it

    in reply to: The PAK-FA Saga Episode IX #2444210
    over G
    Participant

    I think you are overrating your “z pins” there, matt.

    Is not dealing with the main composites problem, the resin, is the resin the one that cracks, no the fibers.

    Actually, the trend is to produce smaller fibers (the nanotubes thingy) to be more homogeneous with the resin, they key for composites is there, the z pins is more like a patch solution for the nowdays capability, and i don’t think is that critical.

    Remember, the F22 program was meant to have 50% of composites, which was cut down to 25%

    About indians, i don’t know, i can tell why the g-loads goals were decreased, why only 6gs were achieved on tests, probably is money probably is technology, probably the designers were way to optimists, i can tell.

    in reply to: The PAK-FA Saga Episode IX #2444689
    over G
    Participant

    Matt is right, i was talking about uses in which composites were not widely used, dealing with compression, under compression it should not fracture, but deform.

    When dealing with tension is reported the fractures issue as matt pointed out, supposedly due issues with the resin, and how it stick on the fibers, but the fibers are actually very strong under tensive loads

    But supposedly continuous fibers should have solved the problem, although i don’t know if it could help the resin resistence

    What is a Z pin BTW?

    in reply to: The PAK-FA Saga Episode IX #2444948
    over G
    Participant

    Composites are ok and all that, but composites are not very good dealing with compressive forces, well, many materials have relative bad performance under compression, but composites are specially bad because the fibers can only have determined orientations, i think depends a lot on the resin, but is not like the resin is concrete 😀

    Anyway, the pictures above are a bit misleading, if i see in one way, then the engine bays must be very close, but with a large area outwards, if i see it on the other side, then there is some kind of weird structure on the fuselage border, these elements are probably not from the su-27/35, i’m not sure which side of the pakfa i’m looking at, probably are not pakfa’s elements.

    . Why do you think when a group of Russian women is cooking something on the table manually has to be from the upcoming high-tech PAK-FA????

    Quality inspection?, i’m not sure i never had been involved in composites production

    in reply to: The Brand New IAF Thread (VIII) – Flamers NOT Welcome. #2412914
    over G
    Participant

    What “IAF specifications” ? Other than a twin-seater what else is IAF-specific in that ? Radar ? Engines ? Stealth ? Avionics ? Anyway, we’ve seen that Sukhoi will design and construct the twin-seater, and not HAL.

    As per the latest interview by HAL chairman Mr. Nayak, there is no difference between the Indian FGFA and the Russian PAK-FA. He was responding to a question when asked that Mr. Pogosyan of Sukhoi has said that leave aside some software differences for weapons integration, the Indian and Russian versions are identical.

    So, where is the question of “IAF’s specifications” ?

    The PAKFA is a pure Russian bird and it does not meet Indian ASRs for FGFA atleast in some respects.All the agreement/contract/co-development bit is regarding the development of the India specific variant.And that agreement is yet to be finalised.Contribution of India in development of the PAKFA is very less if not altogether nil.Maybe some finances and production of some components in India(for both the Russian and Indian versions).Remember that the PAKFA has not flown yet and it will need lot more cash regarding clearing IOC,FOC and productionizing.These are the only places that India can chip in w.r.t the original PAKFA

    Are don’t you asking a bit too much?, are don’t you overating the Indian importance in the aerospace market and technology?

    The russian attitude is balance, is their program, many of you probably are still thinking the russians are broken and are willing to sell all their industrial knowledge, infrastructure and programs to India.

    Nothing has been signed yet, india is not putting money in the pakfa, russians are worried to design a plane not only to sell to India, but for the worlds market

    Not overrating russians, not diminishing indians, but seriously there is a bit of inflated nationalist self importance in this thread

    in reply to: The PAK-FA Saga Episode IX #2412960
    over G
    Participant

    I seriously think that domestic issues from the USA should be discussed only by USA citizens, same as when the USA citizens should stop to love to fit their big noses on other nations problems…

    So i wont say anything about if is right or wrong, just will say how i see the things without political stuff that i don’t really care, saying they are trading social programs for the F22 is ridiculous IMO, they cut the 22, and are accelerating the F35, so i don’t think they are choosing between the 22 and a monster social program that surely involves way lot more resources…

    I bet they found they would need more than 1 F22 to replace each F15, something that you can’t say for the F-15/F-4 transition, in which the Eagle was pretty successful even with the A model, the issue is between the 35 and the 22, not between the 22 and a social program, which…i really don’t know, and don’t care…

    Regarding the pictures and models, “mr. pogo” is probably playing with you all…i really don’t see why they should reveal the plane, no pressure on the government since the thing was shown to some politicians, no industrial pressure since the F35 is still light years away, the AESA was a nice thing though, i think they will play that game, and won’t show it, there will be news “the pakfa first flight”, “the pakfa first missile test”, etc…but they won’t show the plane…

    in reply to: More good JSF news and program updates #2414133
    over G
    Participant

    To tell the truth, i think the whole idea of closed internal bays is a bad idea for a fighter, and don’t see any real advantage compared with a open and well covered bomb bay for the so called RCS requirements, it kills the reaction time to launch a missile, add failure probability and complicate things in general.

    LM designed such funny bomb bay probably because the limitations with a single engined aircraft

    bofors, your idea is totally rejected 😀

    in reply to: More good JSF news and program updates #2414146
    over G
    Participant

    The problem is that, there is not, and should not be a “firing sequence”

    It’s, as well, ridiculously complex, IMO, the problem could be solved with a long pylon holding 2 missiles close to the door, although, i still see some limitations.

    Anyway, i would just wait and see what happens, and this can show us that a “bigger bay” is not better if is not well designed

    in reply to: More good JSF news and program updates #2414153
    over G
    Participant

    Sometimes , there are small hills that cannot be climbed, depends on a lot of factors, if there is enough structure/space to support the weight, if the concave shape of the door is not problematic, if the tolerances of the original concept and design can hold such change.

    I would just wait and see what happens, and if i don’t see the real system i would better say nothing.

Viewing 15 posts - 556 through 570 (of 1,640 total)