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  • in reply to: F-22 Doing A Cobra Maneuver #2563477
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    It is nothing special. With Thrust Vector Control it would be very unusual if it could not do it.

    But the point is:
    Is it able to do this maneuver with service aircraft, not only on tests ?

    Remember that F-14 did the Cobra maneuver in tests, to about 80 degrees Alpha. The F-18 also. But the point is that it should be done in service, and in airshows.

    Note also that MiG-29 and SU-27 do this maneuver without TVC.

    in reply to: The mighty R-35. Best Turbojet? #2596055
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    Why are you so sure that they aren’t. Because if they’re right, you’ll look like a fool?

    Do not be so emotional.

    I know some things which are not familiar to you, because I work on jet evaluation.

    in reply to: The mighty R-35. Best Turbojet? #2596197
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    SO you say that the USAF , DOD and system managers have all lied under oath ?? And no body knows it but you!!! :rolleyes: :rolleyes: The F-22A also managed better range , greater supercuising , better handeling due to much refined FBW and software , lower RCS however these are all probably lies!!

    You need to read up on the F-22 program – the YF22 wasnt supposed to test the “limits of the aircraft ” that was much later in the program with the raptor 01 – raptor-14 being tested to well beyond their limits. The YF-22 was a demonstrator which showed some of the things going into the F-22.

    The reason why the prototypes are built is to explore extreme flight limits which are not going to be allowed in regular service version.

    Look at F-14A. Its test pilot said that it pushed the prototype to 2,41 Mach, but he also said that it has never been tried again.

    So, it is utter nonsense to claim that the F-14A had 2,4 Mach speed.

    in reply to: The mighty R-35. Best Turbojet? #2596200
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    That is debatable. Unless things have changed drastically afterburners typically don’t burn fuel as efficiently as the combustor section.

    Of course.

    in reply to: The mighty R-35. Best Turbojet? #2596212
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    It cools nothing there, because all gases pass through the burner section and were heated-up. What you may mean is, when it works without burner in the subsonic-range till Mach 0,8 similar airliners to get the most mission from fuel!
    When speaking about the military TFs with AB, you are wrong. Even some technical limitations from the 60s do no longer excist.

    There is no point to oppose this basic jet engines principle.
    That is simply a plain fact.

    Because of TF engine core supersonic thrust in dry power is much, much smaller than that of TJ, it is also smaller in A/B. (not to this measure, of course).
    I said, add to this inherent compressor presure limitations of TF, which also greatly effects supersonic speeds.

    in reply to: The mighty R-35. Best Turbojet? #2596218
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    “The F-104 is generally restricted by heat in the compressor section of the engine and certain parts of the airframe. Early Starfighters could not exceed Mach 2.2 without potentially damaging the engine; on later models with the -19 engine this was increased to Mach 2.3. The canopy limit is around Mach 2.6. The airframe on late models is stable out to Mach 2.8.

    The early F-104A was engine compressor limited to 1,9 Mach, but it was soon rised to 2,1 Mach, and finaly to 2,2 Mach. (like F-4J and E).

    Only for the purpose of height record flight, the limit of F-104 has been rised to 2,4 Mach. But that was only once, and never again.

    What do you mean “Conopy limit was around 2,6 Mach” ? Do you know that this speed is beyond thermal barrier. You must have special thermal protection for that kind of speeds.

    Also, you have to understand that it is extremely difficult for have flight stability , around all 3 axes, at 2,8 Mach.
    It is not so easy to acomplish as you think.

    in reply to: The mighty R-35. Best Turbojet? #2596228
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    An aircraft what has demonstrated Mach 2,4 is capable of doing that.

    How cant you understand.
    The service aircraft must be able to do it in regular basis.
    In the test, it is usualy achieved only one time.

    Look at the statement of a test pilot who claims that he pushed the F-14A to the 2,4 Mach. He claims also that it has been done only one time and never again.

    And yet, you keep claiming that the F-14A have had 2,4 Mach speed. !!

    in reply to: The mighty R-35. Best Turbojet? #2596230
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    How fast was the T10: 2230 km/hr. How fast is the T10S: 2500 km/hr. Even Russian aircraft don’t fit your made-up rules.

    Why are you so sure that these figures are correct ?

    in reply to: The mighty R-35. Best Turbojet? #2596870
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    That claim is true in dry thrust only, it is not so in AB.

    In afterburner also. It cools the total airflow.

    One more paramount factor is static compressor pressure ratio which in Turbofans have to be inherently high. That prevents higher supersonic speeds.

    People, you have to understand the basic jet engine principle:

    -The Turbofans are, by definition, engines optimised for subsonic flights.

    -For efficient high supersonic flights, you need a Turbojet. It has higher exhaust gas velocity.

    in reply to: The mighty R-35. Best Turbojet? #2596891
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    Still lying.
    The F-104 and BAC Lightning have/had regulated intakes in regular service.

    Sens, you obviously have very bad sources.
    These two have fixed intakes.

    The first jet fighter with variable intake is MiG-21.

    The TF30 was no bomber engine, what ever that does mean. It was intended to become the first multipurpose TF-engine for multi-role aircraft like the F-111 should have been.

    Do not tell me that you did not know that the F-111 was conceived as a bomber.

    in reply to: The mighty R-35. Best Turbojet? #2596904
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    You lie simply!

    F-14A was Mach 2,4 in the 70s. Later it was reduced more and more to rise life-time exspectations and adapt it to more practical values.

    No,no.
    See “F-14”-Modern combat aircraft series.

    It states that the service F-14A displayed 0,5 Mach lower max speed than F-15A.

    Left the test flights aside.

    in reply to: The mighty R-35. Best Turbojet? #2596905
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    Bypass ratio has an effect on exhaust temperature and velocity which does have an effect on high speed performance.

    Sens, you should have accept this fact by now.

    in reply to: The mighty R-35. Best Turbojet? #2596909
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    Which bomber is that?

    The F-111. Even that unmaneuverable aircraft has very serious problems with high speed compressor stalls.

    in reply to: The mighty R-35. Best Turbojet? #2596912
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    Throwing around such data without the slightest idea is typical.
    High by-pass ratio has nothing to do with high speed performances!

    Sens, I thought that you have learned something by now about jet engines.

    The by-pass ratio is one of the most important figures which effect high speed thrust.

    The by-pass airflow has very low energy and it actually cools down the exhaust gases, which has negative effect on high speed thrust.

    It was introduced only to lower SFC in dry power cruise.

    in reply to: The mighty R-35. Best Turbojet? #2596928
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    You have no real idea you was speaking about.
    The Mach 2,35 was the max allowed top-speed for the MiG-23, which is reached briefly at best. During interceptions the firing-point is reached well below Mach 2 already (40000 feet and above).

    Sens, the point is that at low level, the jet engines are limited by allowed dynamic pressure, and at higher altitudes the limiting factor is CIT.

Viewing 15 posts - 211 through 225 (of 644 total)