dark light

KKM57P

Forum Replies Created

Viewing 15 posts - 46 through 60 (of 577 total)
  • Author
    Posts
  • in reply to: Canards and stealth. . . #2401064
    KKM57P
    Participant

    Panavia Tornado.

    (Did I win?):D

    Yep. After the Tornado follows the F-18.

    Another quiz question.

    What Jet used AESA first?

    in reply to: Canards and stealth. . . #2401070
    KKM57P
    Participant

    yeah they did but then what is an analog flight control systems? any modern aircraft have sensors to calculate air preassures, speed, altitude, etc etc they are not flying on the cyberspace but in real air, even with an analog flight control system is not the pilot who controls the airplane since he is not flying with mechanical or hydromechanical systems but it is the aircraft flight control system via all the sensors and known flying characteristics converted to electric inputs, and they have to be calculated and that means more complexities than a pure hydromechanical system.
    By digital they mean software changes, but it does not mean an analog flying control sysyem does not compute.
    The F-16 is called electric jet simply because is not mechanically controled

    Always stay on the subject!
    Who has something drivelling about computer power?
    Analog FBW is used since 1956 in Europe (Avro Vulcan)!
    The first fighter with FBW was the Mirage 3.:diablo:
    The first Jets with relaxed stability was the Europe VTOL aircrafts. :diablo:
    At this time and long after this fly the US Jets with pipes and steel cable.:diablo:

    The F-16 is called electric jet simply because is not mechanically controled

    The F-16 is called lawndart (widowmaker) simply because no backup system avaible at the early analog FCS.
    In the first decade was the F-16 FBW fault-prone. Somtimes black labour, wire puncture and bad chips (Texas Instrument)….

    in reply to: Canards and stealth. . . #2401191
    KKM57P
    Participant

    By relaxing the stability the basic Mirage III design of the Mirage 2000 was made able to turn tighter, the Mirage F1 was made just with tail because the technology of the time did not allowed the computer power to control an unstable aircraft.

    You need no computer power for a relaxed stability!
    Mirage 2000 and F-16 used simpel analog technology.:rolleyes:

    Quiz question which serial jet used a digital FCS first?

    in reply to: Canards and stealth. . . #2401645
    KKM57P
    Participant

    Now know we that a F-16 has a much better VCS as a F-22.:rolleyes:

    in reply to: Canards and stealth. . . #2401710
    KKM57P
    Participant

    check this at page 71
    http://www.cdi.org/pdfs/stevenson%20f-22%20brief.pdf

    More for interest is the page 37 and 38.

    β€œThe biggest target in the sky, is always the first to die.”:diablo:

    in reply to: Canards and stealth. . . #2401712
    KKM57P
    Participant

    Here is the answer, no, the LERX and tail design are not the best, the tailess delta is the best in terms of drag, the F-16XL and LCA are two good examples but here the problems lies in controlability, that is why most aircraft have either a tail or a canard.

    Wrong the momentum arm at a clean Delta is to short and therefor bleed a clean Delta more engery in curves. With relaxed stability and slates is this a little bit moderated (Mirage 2000) but when I fly then in a curve and then must I bank then bleed a clean Delta more energy despite of relaxed stability. Additionally a Mirage 2000 can do a perfect Cobra without a LERX crook.

    in reply to: Canards and stealth. . . #2402360
    KKM57P
    Participant

    KKM57P :

    Err , so what are the SU-35S , the SU37 or the T-50 ? Are they not Super Flankers ?:rolleyes:

    Cheers .

    T-50 is not a Flanker and a SU-35BM is not a Su-35 it’s only a Su-27SM2 and the GUS is not the SU.
    Su-37 only one exemplar build and then dissipate the SU. πŸ˜‰

    in reply to: Canards and stealth. . . #2402637
    KKM57P
    Participant

    The Cobra manuvre..:(
    It has little to do with operational tactics and manuvres..
    With or without the Carnards in mind.

    Another very usefull russian maneuvre is the Taran very similar to a Cobra without bank. πŸ˜€

    in reply to: Canards and stealth. . . #2402658
    KKM57P
    Participant

    What has this clutter answer to do with your ASPECT RATIO CLAIMS?!:rolleyes:
    Was has this to do with stealth?

    Mod Edit: Personal insult removed. No more, please!

    The Eurocarnards (Rafale, Typhoon) are designed to counter a hypothetical Super Flanker but this Super Flanker never appeared.
    You act like a smoke projector.
    For lateral stability need you first vertical stabilizers placed in the airstream behind the COG.
    (A moveable Canard can aligned to direct the airstream at hig AoA to the vertical stabilizer. A LERX prevent only the vortex seperation on the main Wing and has a marginal effect on the lateral stability.)
    At the F-22 canted outwards to prevent the need of tail fins (a RCS nightmare) like the Su-27 and derivates. But outwards canted is a bad choice for a low RCS therefore stacked between horizontal stabilzer and wing. But this reduce the lateral stability and caused bigger vertical stabilizers and make headaches through long leading and trailing edges. Forget SU-27 and derivates there are long before a dogfight happens dead through theirs vintage RCS, big like a barn door.Straight long inlets ducts acting as wave guide, big 90Β° tail and 90Β° tail fin alligment. Constructed at at a time where as in the western hemisphere s-curved inlet ducts are state-of-the-art and used to shild the compressor and trap the Radar-waves.

    Then should you we not forget the main designer of the X-31 was Dr. Wolfgang Herbst (EADS) and we should no forget all the other German input to the the other X-Planes. Then again the Canard on the X-31 is only a backup when the TVC failed too recover then secure out high AoA and is only free floating! :diablo:

    in reply to: Canards and stealth. . . #2403107
    KKM57P
    Participant

    another trouble of canards is they are more sensitive to aspect ratio, high aspect ratio canards are used for less drag while low aspect canards for lift, this makes constraigns in the mission profile, since some are better for lift but worse for drag and viceversa tailplanes are less sensitive due to the fact they achieve higher lift and lower drag since they do not affect the wing independently of their aspect ratio.
    as a general rule the canard wing configurations achieves less lift than the tail wing configuration.

    I see you have no clue about aspect ratio and the uncoupling at transsonic and supersonic speed. You have no clue about the harmfull impact of the harmfull area.

    In in a curve is your lift sensless, the wing produce near zero or zero lift in this state. This show me you have no clue about fligth dynamics

    in reply to: Canards and stealth. . . #2403246
    KKM57P
    Participant

    If it that is the Cobra why it does bank to the right?, the Su-27 makes it without banking, its wing never banks.

    The Kubachev cobra is russian and was achieved by the first time on a Su-27 not in a Drakken, despite that the drakken does a coul maneuvre

    The bank is necessary to avoid a crash with your opponet or a flame out through hot gas suction (caused a compressor stall). :diablo:

    in reply to: Canards and stealth. . . #2403251
    KKM57P
    Participant

    the tailplane is usually more swept than the wing so it has a lower critical mach number then reducing drag and have a good moment arm force,

    Wrong more swept higher critcal Mach number!
    Momentum arm is a odd thing.
    At a Delta-Wing is the COG more forward shifted as at a ordinary tail aeroplane.
    With a moveable Carnard have we too moment arms πŸ˜‰
    Canard and Ailerons can act as elevator and two is better as one.
    In curves acts the tail plane and the Canard + Ailerons both as sideruder (the axis are now changed, a comon failure that an armchair pilot makes). A 8g curve fly I always with 85Β° lateral inclination (and a 90Β° theoreticall impossible without the sideruder acting as elevator).
    In this position bleed the conventional tailplane yet more energy as a doubleperforming Canard-Aeilron (2 elevators) The tailplane force point now in the wrong direction outside the curve (Wing force MINUS tailpalne force), were as the Canard force points inwards the curve (Wing force PLUS Canard force). Both fly now in the pitch axis stabil the instabil axis is now the sideruder axis!;)

    You can’t **** an old Traper in his Colt.:dev2:

    in reply to: Canards and stealth. . . #2403646
    KKM57P
    Participant

    canards do have more drag than any tailplane at the same size and they reduce wing lift so they have a worse D/L ratio, the advantage is since they do generate a positive lift ahead of the wing and CG they can be make relatively smaller than a tailplane , the only advantage of an aircraft with canards if both are stable is less supersonic trim drag.
    This is offset by the tailplanes only if the configuration is unstable.

    Now LERXes produce stronger vortices, why? simple because they are more swept, however canards have the advantage of distributing their impact on slightly more areas of the wing.

    How should a smaller surface have a greater drag as a big surface?
    http://upload.wikimedia.org/math/5/d/7/5d76f3dd4c6b3066451dad578dad082e.png
    A biger surface has a greater influcence through the harmful areas accumulation and this produce more wavedrag and more retroactivity!
    Since we can optimise a fixed wing (wing including LEX) only for one optimal Mach number (Jones).

    A biger surface and a LERX has a drawback for the RCS.
    The leading edge is a line and this is a reflector.
    Another problem is the stagnation point accumulation (Machcone) is greater and this make a big IR footprint at trans- and supersonic.

    in reply to: Canards and stealth. . . #2404940
    KKM57P
    Participant

    it has to do, a lot, but before you ask me questions ask your self these ones, why the canards in the Gripen are above of the wing level, why they have dihedral, why they they are trapezoidal and not triangular in shape, when you answer your self that ask your self why the F-22 has planform alignement.

    After that you will understand a few things that have been said from the begining of of the thread by em745 who has solved the questions and has answered them since a long time.

    Nether Su-27 and derivates nor the teen series fighter a match in RCS against the Eurocanards.

    in reply to: Canards and stealth. . . #2404945
    KKM57P
    Participant

    Again, what have this all to do with stealth?
    The Su-27 is long before the can do a Cobra detect and dead and the Cobraristi never know why.
    The dumbest idea in a dogfight is doing a Cobra!
    First this bleed all your speed (energy), second are counter Cobra manoeuvre well know (somtimes automated), thirdly is your opponent not a moron and pierced you with a GIAT 30 or BK27 or etc. or a MICA-IR, IRIS-T parks in your backside. Fourthly the probability of a collision with the opponent is greater as 50:50, the Cobra is the air version of the crazy Ivan.:diablo:

Viewing 15 posts - 46 through 60 (of 577 total)