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mig-31bm

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  • in reply to: Eurofighter Typhoon discussion and news 2015 #2178944
    mig-31bm
    Participant

    There isn’t any apparent design features on the intake of Taranis that would suggest that its supersonic, the engine that is installed would require those features to work at +M1

    I can’t see intake bleed spill vents or anti shock wave shaping on the intake…. but there are very few frontal pictures to check.

    Here is intake design required to go supersonic

    An inlet for a supersonic aircraft, on the other hand, has a relatively sharp lip. The inlet lip is sharpened to minimize the performance losses from shock waves that occur during supersonic flight

    https://www.grc.nasa.gov/www/BGH/inlet.html
    Taranis intake look quite sharp and some what similar to F-35 intake, Taranis shape also seem have relatively low drag coefficient thus reduce drag so it probably not a big deal for it to go at speed like mach 1.1 or 1.2
    Not that it really matter for an UAV but i dont think there is anything in term of aerodynamic perspective that would stop the Taranis from going supersonic

    in reply to: Eurofighter Typhoon discussion and news 2015 #2178945
    mig-31bm
    Participant

    What’s powerful enough, in your books? T-38 goes supersonic using mere 34 kN of afterburning thrust while other aircraft like J32 Lansen stay transonic even with double the thrust installed.

    The intake design will affected how much thrust the engine lost when speed raising
    when i say powerful enough , i mean the engine have enough thrust to push Taranis to at least mach 1 even with the loss in thust due to the lack of an intake specialise design for pressure recovery at high speed

    in reply to: Eurofighter Typhoon discussion and news 2015 #2179154
    mig-31bm
    Participant

    Lukos I know I am off topic, but to persist….

    There is nothing from the makers of Taranis that supports the notion it is supersonic. We don’t rely on the Toronto news or the Wollongong post for details on aviation, we look to aviation and defence journals or information from the manufacturer. There are no facts to support the notion of Taranis being supersonic, beautiful though the idea may be.

    To be fair, I dont think UAV nees to go supersonic, since they only do air to ground word, so loiter time and range will be more important
    However, from aerodynamic perspective, i dont think there is anything stop Taranis going supersonic with powerful enough engine

    mig-31bm
    Participant

    No, sorry about it, but i do not want troubles with MBDA. Already had to cut parts of my article…

    :confused::confused: so this is the same as the ” 20 nm passive shot” story then :p??????
    How do you expect anyone to take your words without any evidence ? :p, may be you didn’t lie about the resolution of DDM-NG, but then there is also equal possibility that you make it up

    If we just have to take your words for it without source or evidence then next time we will have to believe anyone about their pilot story whether they made it up or not? :confused:

    mig-31bm
    Participant

    What’s with it?
    I do.. It matches exactly the info from my source.

    Can you or Halloween posted that source here?

    mig-31bm
    Participant

    Oh, I do know it has an ‘IRST’ function (ie. air-to-air modes) however nowhere I have seen stated just what kind of modes they are, what is its scan rate, how big is the FoV etc. If it is similar to targeting pods, then it’s probably mostly good for visual ID of targets acquired by other means (radar). An effective air-to-air sensor requires much wider FoVs than is common with targeting pods.

    Yama, as i have explained : any optical systems : whether it is OFS, Private, AAS-42, OLS-35 or EOTS when they want to see target at maximum range they will have to focus their sensor ( zoom) thus have really small FoV, there is no way around it
    Btw, since you asking about it, what is the FoV and scanning rate of OFS, OLS-35, Private, AAS-42 at maximum range?

    mig-31bm
    Participant

    Aswell as Talios pod btw.

    Btw, why Rafale dont use OFS for air to ground ? , didn’t it have both optic and IR sensors there?

    mig-31bm
    Participant

    1) Superior to DAS in the 640×512 version. Inferior to DAS in 1000×1000 FPA.

    each DAS sensor only have to cover 90 degree, while DDM-NG have to cover 180 degree and using fish eye effect, With 2 times bigger FoV, DDM-NG have to get at least 2 times the resolution to be equal to DAS

    2) There is no indication about it being a 16.7MP sensor, except wishful thinking

    look at the sensor and lens size, it is at least 4 MP

    mig-31bm
    Participant

    Sez who? As I understand, EOTS is basically a targeting pod except in fixed, stealthy installation, which probably means it will come with all the normal tradeoffs of a targeting pod – ie. good range & resolution, poor FoV. Nowhere I have seen stated otherwise.

    EOTS have IRST function as well, a few seconds using Google will show you that
    and no matter if you have an IRST or targeting pod, if you want longer range you will have to zoom ( aka much smaller FoV) , there is no way around that

    mig-31bm
    Participant

    3) In simplistic terms, a human eye has some 500-600 Megapixel resolution in shades of grey but that

    actually, human eye average resolution are alot lower than that, Vsauce made a video about that, you can find it on youtube

    in reply to: Eurofighter Typhoon discussion and news 2015 #2180269
    mig-31bm
    Participant

    MAn you should know that (i) things are evolving (including on Rafale. (igi)

    DAS have 6 sensors vs DDM-NG 2 sensors using fish eye effect => with equal technology level DAS will have better accuracy, range, resolution

    Resolution do not depend only on Megapixels, otherwise a simple Iphone could do as good photos as a high end camera.

    which is exactly what i said from the start but everyone keep arguing about pixels

    mig-31bm
    Participant

    So 6 guys back to back with 5 & 5 on both eyes , see better 360 deg round than 2 guys back to back with 10-10 on both eyes…..???.

    xman, you have to understand what does it mean by pixels first . and the resolution regarding to FoV

    Most budding and professional photographers will tell you that the most important ingredient in the optical system is the sensor, because that’s the part that captures the light. The sensor is essentially the “film” material of a digital camera. No light, no photo.

    Light enters through the camera lens, then passes to the camera sensor, which receives the information and translates it into an electronic signal. From there, the image processor creates the image and fine-tunes it to correct for a typical set of photographic flaws, like noise.

    The size of the image sensor is extremely important. In general, the larger the sensor, the larger your pixels, and the larger the pixels, the more light you can collect. The more light you can catch, the better your image can be.

    The experts I spoke with for this story had colorful ways of describing the relationship between pixels and sensors, but “buckets of water” or “wells” were a favorite (intentionally oversimplified) analogy.

    Imagine you have buckets (pixels) laid out on a blacktop (sensor). You want to collect the most water (light) in those buckets as possible. To extend the water-and-bucket analogy, the larger the sensor you have (blacktop), the larger the pixels (buckets) you can put onto it, and the more light (water) you can collect.

    Larger sensors are the reason that 8 megapixels from a digital SLR camera (or 5 or 13) best those 8 megapixels from a smartphone camera. You get roughly the same number of pixels, but the pixels on the dSLR get to be larger, and therefore let in more light. More light (generally) equals less-noisy images and greater dynamic range.

    The fallacy of megapixels

    You can start to see that cramming more pixels onto a sensor may not be the best way to increase pixel resolution. That hasn’t stopped the cell phone industry from doing just that.

    Jon Erensen, a Gartner analyst who has covered camera sensors, remembers when we collectively made the leap from 1-megapixel to 2-megapixel shooters.

    “They would make the pixel sizes smaller [to fit in more pixels “but keep the image sensor the same.”

    “What ended up happening is that the light would go into the well [the ‘bucket’] and hit the photo-sensitive part of the image sensor, capturing the light. So if you make the wells smaller, the light has a harder time getting to the photo-sensitive part of the sensor. In the end, increased resolution wasn’t worth very much. Noise increased,” he said.

    The relationship between the number of pixels and the physical size of the sensor is why some 8-megapixel cameras can outperform some 12-, 13-, or even 16-megapixel smartphone cameras.

    There’s more involved, too. A slim smartphone limits the sensor size for one, and moving up the megapixel ladder without increasing the sensor size can degrade the photo quality by letting in less light than you could get with slightly fewer megapixels.

    Then again, drastically shrunken pixel sizes aren’t always the result when you increase your megapixels. HTC’s Bjorn Kilburn, vice president of portfolio strategy, shared that the pixel size on the 16-megapixel Titan II measures 1.12 microns, whereas each of the HTC One X’s 8 pixels measures a slightly larger 1.4 microns.

    As a result, the photo quality on both these HTC smartphones should be comparable at a pixel-by-pixel level.

    Unfortunately, most smartphone makers don’t share granular detail about their camera components and sensor size, so until we test them, the quality is largely up in the air. Even if smartphone makers did release the details, I’m not sure how scrutable those specs would be to the majority of smartphone shoppers.

    in reply to: Eurofighter Typhoon discussion and news 2015 #2180330
    mig-31bm
    Participant

    http://i.imgur.com/TdWUZZg.png
    This article and this data sheet confirm it; the EODAS system uses L3’s 4MP sensor.[/b]

    Specifically; you can see the edges of the FPAs on the new 4″ diameter wafer; if you use an image editing or CAD program you can then see for yourself that a 1.2″ (30.7mm) sided FPA (as per the datasheet) creates the exact same pattern scale as in the AFRL image.

    It’s possible that it’s just a 1MP sensor; L3 doesn’t have a datasheet for their 1MP sensor, and it’s not uncommon to use (eg) 4MP arrays downsampled to achieve a more reliable or better quality 1MP image. However, the fact that they don’t provide a datasheet for the 1MP sensor, plus the fact that the EODAS sensor is physically larger than the 2MP sensor in the HMDS, and needs to achieve a decent level of resolution over it’s ~120 degree FOV means that it’s almost certain that it has a resolution of 4MP.

    The 16MP sensor is twice the width / height of the 4MP and wafer size is measured in diameter by convention, so it’s (unfortunately, and only just for now) not the 16MP sensor.

    anyway , i dont think we should hang up too much with the pixels number, not only that it doesn’t actually represent the actual capability of a sensor ( the reason have already been explained, but also, i dont think LM would really have any have any trouble upgrade the pixels number to 10 or even 20MP if they really want to, i mean look at the size of each DAS sensor, and the size of the camera in your smart phone

    in reply to: Eurofighter Typhoon discussion and news 2015 #2180517
    mig-31bm
    Participant

    that would be something like 1024×1024 pixels

    pretty much any civilian digital camera from the last 10-15 years has a higher resolution than that (some a lot higher). even a smartphone does, and in any case, 1MP resolution, with a wide angle lens is absolutely not suitable for a detailed picture of anything further than a few dozens of meters

    I found this :

    Most budding and professional photographers will tell you that the most important ingredient in the optical system is the sensor, because that’s the part that captures the light. The sensor is essentially the “film” material of a digital camera. No light, no photo.

    Light enters through the camera lens, then passes to the camera sensor, which receives the information and translates it into an electronic signal. From there, the image processor creates the image and fine-tunes it to correct for a typical set of photographic flaws, like noise.

    The size of the image sensor is extremely important. In general, the larger the sensor, the larger your pixels, and the larger the pixels, the more light you can collect. The more light you can catch, the better your image can be.

    The experts I spoke with for this story had colorful ways of describing the relationship between pixels and sensors, but “buckets of water” or “wells” were a favorite (intentionally oversimplified) analogy.

    Imagine you have buckets (pixels) laid out on a blacktop (sensor). You want to collect the most water (light) in those buckets as possible. To extend the water-and-bucket analogy, the larger the sensor you have (blacktop), the larger the pixels (buckets) you can put onto it, and the more light (water) you can collect.

    Larger sensors are the reason that 8 megapixels from a digital SLR camera (or 5 or 13) best those 8 megapixels from a smartphone camera. You get roughly the same number of pixels, but the pixels on the dSLR get to be larger, and therefore let in more light. More light (generally) equals less-noisy images and greater dynamic range.

    The fallacy of megapixels

    You can start to see that cramming more pixels onto a sensor may not be the best way to increase pixel resolution. That hasn’t stopped the cell phone industry from doing just that.

    Jon Erensen, a Gartner analyst who has covered camera sensors, remembers when we collectively made the leap from 1-megapixel to 2-megapixel shooters.

    “They would make the pixel sizes smaller [to fit in more pixels “but keep the image sensor the same.”

    “What ended up happening is that the light would go into the well [the ‘bucket’] and hit the photo-sensitive part of the image sensor, capturing the light. So if you make the wells smaller, the light has a harder time getting to the photo-sensitive part of the sensor. In the end, increased resolution wasn’t worth very much. Noise increased,” he said.

    The relationship between the number of pixels and the physical size of the sensor is why some 8-megapixel cameras can outperform some 12-, 13-, or even 16-megapixel smartphone cameras.

    There’s more involved, too. A slim smartphone limits the sensor size for one, and moving up the megapixel ladder without increasing the sensor size can degrade the photo quality by letting in less light than you could get with slightly fewer megapixels.

    Then again, drastically shrunken pixel sizes aren’t always the result when you increase your megapixels. HTC’s Bjorn Kilburn, vice president of portfolio strategy, shared that the pixel size on the 16-megapixel Titan II measures 1.12 microns, whereas each of the HTC One X’s 8 pixels measures a slightly larger 1.4 microns.

    As a result, the photo quality on both these HTC smartphones should be comparable at a pixel-by-pixel level.

    Unfortunately, most smartphone makers don’t share granular detail about their camera components and sensor size, so until we test them, the quality is largely up in the air. Even if smartphone makers did release the details, I’m not sure how scrutable those specs would be to the majority of smartphone shoppers.

    in reply to: Eurofighter Typhoon discussion and news 2015 #2181617
    mig-31bm
    Participant

    In a large scale conflict against Russia or China, there, too, isn’t any difference because it won’t stop ICBMs turning your air bases to ashes within seconds.
    Does that mean AESA is only useful against the “right sized” enemy with “right sized” force of “right sized” sophistication?

    Well, we are compared conventional weapons such as tanks, ship, Fighter, SAM here because a large scale nuclear conflict are very unlikely to happen, if they happen then it doesn’t
    matter what you fly or drive

    Well, thats all nice and correct, I can google, too… but what exactly is your point? That the testers are completely unable to assess sample error or determine the right significance level without your help?

    No, the point is you dont know the actual percentage of improvement in mission accomplishment rate, thus it not possible for you to conclude how important an AESA radar compare to other features such as IRST, super maneuver.. etc

    When was the claim about 400% efficiency made?
    Certainly not in 2015, the topic is fairly dated..

    Here are the time line

    The JSF development contract was signed on 16 November 1996, and the contract for System Development and Demonstration (SDD) was awarded on 26 October 2001 to Lockheed Martin, whose X-35 beat the Boeing X-32

    The F-35B STOVL variant was in danger of missing performance requirements in 2004 because it weighed too much; reportedly, by 2,200 lb (1,000 kg) or 8 percent. In response, Lockheed Martin added engine thrust and thinned airframe members; reduced the size of the common weapons bay and vertical stabilizers; re-routed some thrust from the roll-post outlets to the main nozzle; and redesigned the wing-mate joint, portions of the electrical system, and the portion of the aircraft immediately behind the cockpit.[24] Many of the changes were applied to all three variants to maintain high levels of commonality. By September 2004, the weight reduction effort had reduced the aircraft’s design weight by 2,700 pounds (1,200 kg),[25] but the redesign cost $6.2 billion and delayed the project by 18 months

    On 7 July 2006, the U.S. Air Force, the lead service for the aircraft, officially announced the name of the F-35: Lightning II

    September 20, 2008 U.S. Air Force analyses show the Lockheed Martin F-35 Lightning II is at least 400 percent more effective in air-to-air combat capability than the best fighters currently available in the international market.

    And whether the claim was dated or not, USAF are the people who have actual access to the aircraft , and many classified information, so i believe that they can test their equipment properly. 😉 Or are you trying to say USAF have no idea how to test their equipment and that maybe they need you to get a grip on reality?;)

    Hmm, I still don’t get the meaning of this argument.. What exactly are you trying to say? That DOT&E have no idea how to test their equipment and that maybe they need lukos and you to get a grip on reality?

    No the point is DOT&E ( or any government ) base the value of weapons on the kind of enemy they are likely to face
    up until now, F-18E/F mostly used to bomb man living in cave thus their assessment that in actual operationnal APG-79 radar didn’t improve mission accomplishment rate significantly is correct , but that doesn’t mean they don’t consider AESA radar as a valuable asset again future capable enemy

Viewing 15 posts - 886 through 900 (of 1,759 total)