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  • in reply to: PAK FA news #2650329
    over G
    Participant

    The F-22 doesn’t have a delta wing anymore than the F-15 does.

    anyway sferrin, you can believe what you want, that isnt my problem

    in reply to: Mig-31 versus F-22 #2650336
    over G
    Participant

    welll, the conventional concept of super-maneuverability (that uses some techs) is at low-very low subsonic.

    what i mean about the planes in my post above i was comparing f18-16 with su27-mig29, not the F22, or the EF, there isnt much data about those planes.

    now about the f22 vs EF supersonic turn, well if both airframes are strenghted enough it could be true the claims of the better ultimate or controlable -not instantaneus in the subsonic sense- EF turn, the Raptor could have better sustained turn by the TVC (stronger controlls)-sustained without loosing energy to fall in subsonic-, but right now those are only claims, but remember, when the speed increase both instantaneus and sustained turn values get close

    sferrin, you arent saying any argument, man i tried to explain you how works that design, look you have your opinion, i have the mine , we can live with that difference, this disscusion is endless, we can live in peace….

    in reply to: Mig-31 versus F-22 #2650466
    over G
    Participant

    sfrrin, i think that those planes are modified test planes, but that dont mean “problem solved”

    in reply to: Mig-31 versus F-22 #2650478
    over G
    Participant

    ahhhh seahawk, supermaneuverability is a concept to medium-low-very low speeds, you can only increase the turn at higher speeds increasing the g limit.

    now, both russian and american planes have the same turn performance at medium high subsonic, the diference is at high transonic (above M0.9), but such speeds arent considered important in dogfights (because to reach those corner speeds, you must start at supersonic) at supersonic both team designs are equal good, also you must consider the heigh performance, energy saves etc…

    in reply to: Mig-31 versus F-22 #2650505
    over G
    Participant

    the f22s big problem, is to try to use a diverse variety of concepts and techs in one airframe, at the end of the day we have an machine somewhat mediocre in all those aspects

    in reply to: Mig-31 versus F-22 #2650550
    over G
    Participant

    about the f16 AOA, well is ridicoulus to compare a xperimental with a operative machine

    in reply to: Mig-31 versus F-22 #2650559
    over G
    Participant

    sferrin, man you wont reduce the RCS in 40% only with that nose shape and ferropaint specially with such huge machine and at M3 speeds…..comon…

    Get it right, man. The original A-11 had no chines. They were added to create the A-12 design in an effort to reduce RCS

    The YF-12A was admittedly more unstable than the A-12 and SR-71, but once the ventral fins were added the remaining instability was able to be s

    well, i really dont know much about the planes history, but i know about aero-design, again thats the whole point, the nose shape is an aerodynamic requirement, later changed with operative-electronics requierements, there are loooots of examples about that design, search by your self, i think that the requierement was for aero-pics not for stealth and oviusly supersonic control, also remember that one thing is a proyect (A11) an another is the operative machine.

    the nose shape help in the stability with the shockwave shape, a high speed cilindrical (cone) SW is somewhat problematic, remember that the design must deal with other 2 big cilidrical SW (intakes) so the interaction could induce some problems in sustained flight

    about the f22, remember ,the AoA is artifitial (TVC), not aerodynamic, like in the su27

    in reply to: Mig-31 versus F-22 #2651263
    over G
    Participant

    The chines where cut back to make room for the radar on the YF-12A and the ventrals were added to maintain stability when the radome was added

    thats the whole point…..an cilindrical nose is more unstable at such speed, the sr71 nose is for high speed stability not for stealth, but even addind the vertical tails you wont reach the supersonic performance of the chined nose

    And why WOULDN’T you want to reduce the RCS if you can?

    ahhh, the design isnt a game, you cant play like an idiot “well we can reduce a minimal proportion of the rcs compromissing some things in a high performance plane“, but again the blackbird had ferropaint, something secundary, the designers done well , its an supersonic nose, not an stealth nose (stupid trying to design only a stealth nose, when you have such huge intakes)

    in reply to: PAK FA news #2651274
    over G
    Participant

    man, i dont know if believe in that “Sorry Over G, I’m right. I ‘m an Aerospace engineer”, because your claims are pretty wrong, trapezoids has low leading edge angle, making proplems in the airflow at high speeds -in fact that could be the main reason -im not sure- of the f18 “wing drop” at transonic-, but works good at lower speed, due the better aspect and lift vector position.

    the best wing for transonic subsonic is the V wing (but also that is relative)

    the f22 wing isnt trapezoid, its delta, but again there are some idiots (i mean books and cororatives) that has satanised the “delta” (like canard or other words) word, the delta works good on unstable conceps, but not in the f22, due isnt a canard.

    Im not engieener, but i have friends that work in the area.

    anyway sundog, you can believe what you want, that isnt my problem :rolleyes:

    in reply to: Mig-31 versus F-22 #2651281
    over G
    Participant

    So? That doesn’t change the fact that the chines were added to the A-11 design, thereby creating the A-12, in an effort to reduce RCS.

    man, that has nothing to do with the RCS, that option was changed because in the f12 was a must the cilincrical nose (for radar-electronics), so later the nose was optimised to supersonic stability, it is stupid, look the huge intakes RCS, and you are worried (as sfrin) with the nose…..tssssss… :rolleyes:

    in reply to: Mig-31 versus F-22 #2653071
    over G
    Participant

    well, i think that the stealth disscusion is endless, i just try to be scientific and objetive, but again……..what can i do…….

    HF waves have an more particle behavior (by the quantum propieties), so are more easely to absorb ( thats the reason of the lower detection range of the HF radars or radios, or the red sky color on sunset), IR energy gets absorbed more easely, but again (as radar energy) the stealth tech is very overrated, like the garry “naked eye” example, but is more complicated, because in the absortion or reflection process the energy can turn in other lower frecuencies

    you can reduce detection against HF radars (but not as some claims), but if you want an LF-MF precise fire control sistem, well, thats a more algorithm-math problem than a harware problem

    supercruiser isnt only max SC speed, is more related with the range that can be reached at that speed -and related with relation between practical speed-range-, lift (sustained heigh-climb),etc, the M1.7 claims -if are true- are at special conditions, but is more credible that the f22 SC speed will be lower than M1.5

    that discussion of the “sky color” or f117 camouflage at night is ridicoulus

    in reply to: PAK FA news #2653076
    over G
    Participant

    sundog, you are wrong, are very public the f18s transonic problems.

    btw the f22 isnt an trapezoid wing, its an delta, but again there are some guts that think “delta” word is a cursed word :rolleyes:

    You’ve obviously never seen the YF-23 manuever.

    ahhhhh…..

    in reply to: Mig-31 versus F-22 #2654183
    over G
    Participant

    So when an F-117 isn’t shot down, it’s not because the stealth design worked, but when it is shot down, it’s because the stealth design was flawed?

    SOC, man,again im not saying that the 117 is an stealth sucker, but the stealth rate and capacity is overated

    in reply to: Mig-31 versus F-22 #2654230
    over G
    Participant

    crap. How many of them flew over Baghdad in 1991 and were never even seen or hit? When they flw over Baghdad they were very much alone.

    well, i give more credit to that madness cuantify of tomahawk launched, and obvius good planing, among other reasons

    in reply to: Mig-31 versus F-22 #2604753
    over G
    Participant

    man, there are looooots of hypersonics designs with that nose design, the reason???…….stealth?????….noooooo, supersonic stabilization

Viewing 15 posts - 1,231 through 1,245 (of 1,640 total)