dark light

KKM57P

Forum Replies Created

Viewing 15 posts - 286 through 300 (of 577 total)
  • Author
    Posts
  • in reply to: The EuroFighter Typhoon #2497022
    KKM57P
    Participant

    If the pilot wants to use IRST to do the jobs of tracking, identifying, and ranging, then it can only handle a single target at one time within a very limited effective range (around 30 ~ 55 km), which is still not good enough when considering that the combination of Raptor + AIM-120C6/C7/D has the BVR capability to attack more than six targets at the range of 80 to 100 km+ away……

    And even if the pilot of EF-2000 identifies and locks F-22A successfully with the help of Pirate IRST, then what kind(s) of weapon(s) shall Typhoon be able to use to shoot Raptors down?? The active seekers of BVRAAMs like AIM-120 or Meteor are much less powerful than modern fighters’ radars today, which are highly unlikely to be able to lock Raptor successfully. Modern WVRAAMs with IIR seekers like ASRAAM or IRIS-T may have more chance, but their effective range is much less than AIM-120C6/C7/D, especially when the later is fired from the F-22A with high speed (1.5-1.8 M) supercruising…..

    But the heart of PIRATE/IRST is a Quantum Well Infrared Photodetector (QWIP) and not a simple IRST. PIRATE/IRST has a detections range for a subsonic targets of 50nm. A Raptor with 1.7Mach generate a shock cone with a stagnation temperature of 188 deg. F that make it to a very hot target.;)

    in reply to: Rafale news III: the return of the revenge #2498725
    KKM57P
    Participant

    Meteor will be ‘network-enabled’. A two-way datalink will allow the launch aircraft to provide mid-course target updates or retargeting if required, including data from offboard third-parties. The datalink will be able to transmit missile information such as functional and kinematic status, information on multiple targets, and notification of target acquisition by the seeker. The two-way datalink is compatible with Eurofighter and Gripen but not with Rafale which is fitted with a one-way link originally designed for use with MICA.

    Source: Jane’s Missiles and Rockets

    in reply to: Rafale news III: the return of the revenge #2452261
    KKM57P
    Participant

    Disadvantages of a closed coupled Canard is
    β€’ Possibility for adverse flow disturbances over the wing from the canard.
    β€’ High canard CLmax leads to low efficiency e, and high e leads to low CLmax.
    β€’ Generally have a small moment arm to VT, close coupled canard requiring a larger area as a long coupled canard.

    The ‘bravest’ way to use canards is the the Typhoon way. Much mounted well forward of the wing which greatly increases the moment arm and minimises the effects of downwash on the inner main wing. The Typhoon is the only fighter to use this form as the Rafale, Flanker, J-10, Gripen et al use the safer, less destabilising ‘close coupled’ arrangement. Computer testing is said to demonstrate that adding TVC to the Typhoon would not enhance agility, despite test engines have been bench run already.

    in reply to: Rafale news III: the return of the revenge #2452289
    KKM57P
    Participant

    On both

    in reply to: Rafale news III: the return of the revenge #2452312
    KKM57P
    Participant

    http://www.planepictures.net/netshow.php?id=778486

    http://www.planepictures.net/netshow.php?id=778487

    Actually, it’s just a form/weight matter here. These are free fall bombs, but they act like GBU’s or AASM, as long as they’re not intended to be shot.

    PS : Rafale F3 also uses PowerPC.

    Videos of early prototypes :
    http://fr.youtube.com/watch?v=9VPEU6GlGUI

    Why is the FBW so jittery by the Rafale?
    2:06-2:24
    http://de.youtube.com/watch?v=isg3Jmigux0
    I have this often noticed by the Rafale.
    The same 0:42 1:28
    http://fr.youtube.com/watch?v=9VPEU6GlGUI

    PowerPC is Motorolla (now Freescale Semiconductor) too and PowerPC is not PowerPC it’s depends on the Typ of PowerPC.;)

    6800 8bit
    ————–
    Total another technology

    68000 16bit intern 32bit
    68020 32bit intern 32bit

    in reply to: Canards and the 4++ Gen. aircraft #2453429
    KKM57P
    Participant

    It doesn’t matter whether big tail plane or small canard, the magic words is sweep and negativ dihedral
    Planform cure not the RCS hotspot at 90Β° (frontal to the leading edge)
    When you have a tail plane then must you the vertical stabilizers cant inwards for a low RCS but then have you a IR-reflection
    problem (Have Blue). The second choice cant the vertical stabilizers outwards ( inwardly canted vertical stabilizers minimized yaw-roll-coupling and outwards canted maximized the yaw-roll-coupling).
    For circumvent dihedral reflection is it not a bad choice the elevator arrange far away from the vertical stabilizer.
    Need you a lower RCS then need you a flying wing (Ho229 or B2) no tail is the best tail (RCS). πŸ˜‰

    Planform can’t offend against:
    1.Law of conservation of energy
    2 Reduced you the monostatic RCS by shaping,
    you must the energy distributed elsewhere!
    3. Anyway the target RCS is increased at ~all bistatic angles.
    So much about the planform Hyphe.

    Yes bistatic Radars is avaible, bistatic Radar is a very old Radar technology.
    For example the “Chain Home” or the “Kleine Heidelberg Parasit” were bistatic Radars.

    PS. I forget the OTH Radars, Woodpecker http://pripyat.com/ru/internet_photo/chernobyl_2/
    Jindalee http://www.dsto.defence.gov.au/page/3984/

    in reply to: Canards and the 4++ Gen. aircraft #2453602
    KKM57P
    Participant

    Wasn’t Kelly Johnson. It was at a seminar on stealth or a next generation fighter (ATF/F-22/23) and it was a Northrop engineer.

    The Orginal Kelly Johnson citation: “The best place for a canard is on someone else’s aircraft.”

    in reply to: Canards and the 4++ Gen. aircraft #2453722
    KKM57P
    Participant

    A precise explanation can only be given by experts, but an american engineer once commented that the best place for canards (probably during a discussion on the optimum placement of canards) was on one’s enemy’s aircraft. Paul (overscan) , probably can quote the incident with complete details.

    Very old citation of Clarence Leonard β€œKelly” Johnson the same Kelly Johnson mean at this time that a LERX is a piece of crap.

    in reply to: Will the Eurofighter flop? #2455380
    KKM57P
    Participant

    In BVR, I know which I’d rather be flying in. I’m not arguing that the F3 outperforms the Fulcrum in WVR, or even comes close for that matter.

    Come on, this Ford-T MiG-29 Radar with hand crank is always better as the F3 Radar. πŸ˜‰

    in reply to: F-35 failed at noise measurements #2455747
    KKM57P
    Participant

    Those don’t seem to have had much impact on air warfare. πŸ˜‰

    Acoustic Location and Sound Mirrors.
    http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm

    http://www.arcus.org/Witness_the_Arctic/Spring_97/CRREL.pdf

    Acoustic Aircraft Detection Over Polar Snow The objectives of this research were to:
    β€’ measure acoustic aircraft signatures on the Greenland Ice Cap, and
    β€’ conduct basic acoustic measurements of parameters needed to model
    this environment. Field studies during this program obtained actual signature measurements on a
    military aircraft as well as basic scientific information characterizing acoustic propagation, so that the effect of this environment
    could be assessed. The project provided information needed to assess the feasibility of acoustic detection of aircraft,
    cruise missiles or ground vehicles by unattended ground sensors
    in areas with a permanent polar snow cover.
    3 Arctic Research Consortium of the United States Measurements of sound levels and
    spectral signatures of LC-130 Hercules fixed-wing aircraft were obtained during
    normal operational flybys, takeoffs and landings at Dye 2 in the center of the Greenland Ice Cap. Measurements were
    also made of controlled acoustic pulses propagating horizontally over the snow surface. Aircraft recordings were obtained
    under both calm and high-wind conditions. High winds significantly decreased the aircraft detection range, especially at
    low frequencies. Controlled pulse experiments showed that surface conditions in these areas can
    change quite rapidly. The experiments provided information that will be used to construct an accurate propagation model.
    This information can be used in the design of new surveillance sensors and estimation of sensor performance in polar regions.

    in reply to: F-35 failed at noise measurements #2455853
    KKM57P
    Participant

    Why is that? The installed thrust is less on the F-35.
    They should measure against the Super Hornet – that thing is louder to my ears.

    Any acoustics experts here?

    But 1+1 make not 2 in acoustic, interference between two sources can extinguish some dB.;)

    in reply to: F-35 failed at noise measurements #2455881
    KKM57P
    Participant

    Yes it’s a military and a zivil problem.

    It’s trigger for example geophone and seismographen.

    Degraded your property value.

    in reply to: Will the Eurofighter flop? #2457907
    KKM57P
    Participant

    Air at 40,000 ft over Afghanistan could be cooler even.
    Dry air cools down faster than wet air. πŸ˜‰

    http://en.wikipedia.org/wiki/Earth’s_atmosphere

    But cold air is dry air!:rolleyes:
    A better example is a humid hot singapore day.;)
    F-15 and Rafale can’t demonstrate supercuise but Typhoon demonstrate this well!:D

    in reply to: Will the Eurofighter flop? #2458626
    KKM57P
    Participant

    Well, Typhoon beeing a flop… I would think yes, it is a flop if two core nations try to reduce their orders in favour of an US design.

    Or is the F-35 a flop, why Italy opt out oft the F-35 AB Tier-Programm?
    UK have the alternative for the F-35B a Marine Typhoon evaluated.
    A little more engine problems and you can say good bye F-35B.;)

    in reply to: The EuroFighter Typhoon #2458863
    KKM57P
    Participant

    EAP weight 9,935 kg and has little to do with the Typhoon.
    Why should the difference between EAP 9,935 kg and T1 11,000 kg 20%?
    That is a PISA miracle!:confused:
    EAP hadn’t BK27 + 102.5 kg
    EAP hadn’t Radar.
    It’s only ~11%! without BK27 and with BK27 9.7%
    But the Typhoon based on the MBB JΓ€ger 90 and not on the EAP.:diablo:

Viewing 15 posts - 286 through 300 (of 577 total)