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KKM57P

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  • in reply to: The EuroFighter Typhoon #2458897
    KKM57P
    Participant
    in reply to: Radome/LO problem #2459490
    KKM57P
    Participant

    The antenna on the 35 is tilted back more because the AESA intrinsic problems, than because stealthy reasons

    Out “Signal Processing for Airborne Bistatic Radar”
    “Antenna RCS
    In order to minimise the RCS of the aircraft, several measures must be taken. Firstly, the RCS of the installed antenna is reduced by carefully designing and fabricating the antenna, reducing each of the four components of backscatter . The components of backscatter from a planar array antenna are the edge diffraction, antenna mode reflections, structural mode reflections and random scattering. These mirror like reflections from the antenna structure may be controlled by physically tilting the antenna. The
    antenna is tilted at an angle, so that the reflections are not directed back in the direction from which the illuminating radiation came from. Although the tilt does not reduce the reflections, it prevents the threat radar from receiving them.”

    in reply to: Radome/LO problem #2460101
    KKM57P
    Participant

    BASE
    The radome is comprised of a complex layered Glass Fibre Reinforced Plastic (GFRP) structure manufactured using very high tolerance automated processes. Since the material used to construct the radome must be transparent to microwave energy it is an obvious source of Radar Cross Section (RCS) reduction problems. To overcome this, BASE, British Aerospace Systems and Equipment who supply the radome structure have developed various Frequency Selective Surface (FSS) materials which have been subsequently put to use in the Typhoon’s radome. FSS materials are composed of a precisely defined array of metallic elements contained within a conducting frame. The use of these materials (when laid up in the correct fashion) results in a reduction in the transmission of all out of band frequencies. Therefore the radome can be designed to be transparent only to those frequencies and polarisation’s used by the aircraft’s own radar. This of course should lead to a reduction in the aircraft’s radar cross section, from all frontal aspects at least.

    in reply to: Radome/LO problem #2460350
    KKM57P
    Participant

    I think it’s tilted back for A2A threat and not for A2G.
    The same example with the mirror.
    In A2G works the JSF antenna hard on the physical possibilities! http://www.radartutorial.eu/17.bauteile/bt36.en.html

    in reply to: Radome/LO problem #2460365
    KKM57P
    Participant

    But the surface of your Raptor or Typhoon radom is extrem swepted.:rolleyes:
    Or see your self in a mirror when you look at it from sidewards.;)
    The incoming Radar waves are scattered from the front quadrant away.:cool:

    in reply to: Radome/LO problem #2460384
    KKM57P
    Participant

    But with pin-diodes can you switch the polarisation and frequency or make it untransparent.;)

    A special feature is that the filter property of the material is controllable by switching diodes between the layers. So you could, for example, interior walls of a building needed to make permeable. Less peaceful apply FSS (RAS CA) material, as shell coating (radomes) for radar antennas on fighter aircraft or ships. Only their own radar signal pass through, but filters out enemy signals, so that no enemy radar echo of their antennas gets.

    in reply to: Radome/LO problem #2460512
    KKM57P
    Participant

    RAS and CA.
    The Typhoon has a Radar selectiv radome produce by BAE.

    KKM57P
    Participant

    Yip. Like the Blackburn Buccaneer. Optimized for transonic speeds.

    Like the F-22, Typhoon and so forth…

    KKM57P
    Participant

    You should not mix up Frenzl’s transonic area rule (Mach 0.8-1.2) with Jones’ supersonic area rule.

    It’s always better to place noxious cross sectional area in front of the wing.

    in reply to: Rafale news III: the return of the revenge #2464548
    KKM57P
    Participant

    Civilian micro-satellite launcher = military anti-satellite missile launcher ๐Ÿ˜‰

    Who start a satellit against the earth rotation? No one!:D
    For a anti-satellit-weapon is the shown start direction. alright.;)

    in reply to: SU-35 , how will it sell? #2470085
    KKM57P
    Participant

    Meteor does not use a jet engine.

    Just for remember.:rolleyes:

    Rocket engines – are technically jet engines :). Ramjet is technically a jet engine!

    in reply to: SU-35 , how will it sell? #2470309
    KKM57P
    Participant

    Meteor does not use a jet engine. A comparison with Me262 has no relevance here.

    All modern fighter use a air-breathing jet-engine!

    A RAM-Jet is a air-breathing jet-engine.:rolleyes:

    http://en.wikipedia.org/wiki/Jet_engine#Types ๐Ÿ˜‰

    Oxidator caused additional weight or decreased range.
    Oxidator caused additional drag and weight, you need a greater rocket for the same distance.

    in reply to: SU-35 , how will it sell? #2470643
    KKM57P
    Participant

    KKM57P you contradicted yourself within your own post.:rolleyes:;)

    The detection range and tracking range ARE completely different, so is the lock on range.

    Just because you can detect a target, doesnโ€™t mean that you can track it. And even if you can track a target it doesnโ€™t necessarily mean that you can track it well enough to get a lock on it.

    Is easy to detect a target from far away, you have to be closer to be able to track it, and you have to be even closer to get a lock.

    When you detect your target then constricts you your search cone, now scan your Radar faster this sector and achieved now more hits and begin tracking.
    Now can you move away and you have tracking with a greater distance as in Volume search range and whit a pencil beam burn you through the ECM! ๐Ÿ˜‰ Tracking is sector search. But you use for searching volume and area search and this degrade your detecting range in the real life.

    Under laboratory conditions, of course, you can use sector search but left or right from this sector know you nothing!

    in reply to: SU-35 , how will it sell? #2470655
    KKM57P
    Participant

    A: No, it should be that the tracking range is much shorter than the detecting range of the same radar for the same target.

    That is a IF-function and depend from the wide of your search sector and the scan speed. You need more than one hit or your false alarm rate going to high.
    When you have detect a target then can you switch to a smaller search cone or use a pencil beam then is your tracking range higher as your detecting range. This is not really a usefull prospect figure.;)
    What by these great distances is overlooked is the low pulse repetition frequency and the drawback. With low pulse repetition is your Radar farsighted but sightless in the near field. You can not alyways work with low PRF for nearfield detection need you high PRF.

    in reply to: SU-35 , how will it sell? #2470665
    KKM57P
    Participant

    .. you forgot the weight penalty of the intake system plus greatly increased drag..

    Then were the Me 163 B the better solution as a Me 262 and all Jets would use rocket engines!:diablo:

Viewing 15 posts - 301 through 315 (of 577 total)