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robban

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Viewing 15 posts - 271 through 285 (of 360 total)
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  • in reply to: Possible new aircraft sighted at Groom Lake…? #2517773
    robban
    Participant

    Here’s what I can make out.

    http://img.photobucket.com/albums/v486/robban75/plane.jpg

    in reply to: JAS Gripen carry out IRIS-T flight trials #2528343
    robban
    Participant

    The IRIS-T is slaved to the Cobra IMHD, which is avaliable as an option in the export version of the Gripen(JAS 39C/D). South Africa will be the first to get it when they take delivery of their Gripens in 2007. Although the SAAF uses the (excellent) A-Darter, not the IRIS-T.

    http://www.sg.hu/kep/2006_04/sg23_13.jpg

    The off-boresight capability of the IRIS-T is at least +/- 90 degrees

    in reply to: Mirage 2000 #2530423
    robban
    Participant

    Doubling time is a means to measure instability. If say, a Eurofighter starts to pitch its nose, and the computers doesn’t stop it, the pitching moment will double for every 0.3 seconds.

    It’s hard to explain. Hopefully someone else can do it better than me! 🙂

    in reply to: Mirage 2000 #2530775
    robban
    Participant

    I read that the Rafale had(has?) a doubling time of 0.7 seconds, the Gripen 0.4 seconds and Eurofighter 0.3 seconds. The numbers were posted in the Swedish “Mach” magazine sometime in the mid 90’s. What is the doubling time for the Mirage 2000?

    in reply to: Best AirShow Performer? #2531207
    robban
    Participant

    I think the Mirage 2000 is one of the most impressive airshow performers. 🙂

    in reply to: Austria Cancelling Eurofighter ? #2533092
    robban
    Participant

    What is written in this article? Can anyone translate? http://www.krone.at/index.php?http://wcm.krone.at/krone/S25/object_id__55899/hxcms_popup/index.html

    Is the Austrian parlament is cancelling the Eurofighter? :confused:

    in reply to: No plans for EJ200 Gripen #2533319
    robban
    Participant

    GE Military Systems said, “If a F414 version of the Gripen will become reality, then we will let Volvo take the lead”. Vovlo already produce the mid frame, fan disc 1, and the compressor case assy for the F414 fitted to the Super Hornet.

    So, GE really believes in Volvo. So I guess if Gripen will be fitted with a new engine in the future, it most likey will be the F414. 🙂

    in reply to: No plans for EJ200 Gripen #2533655
    robban
    Participant
    in reply to: to canard or not to canard #2537278
    robban
    Participant

    Most of the canard equipped fighters of today has slight dihedral canards. Maybe it’s a sollution not to disturb the airflow over the main wing?

    http://img.photobucket.com/albums/v486/robban75/wings1.jpg

    in reply to: F-22 Doing A Cobra Maneuver #2537427
    robban
    Participant

    I’d be surprised if modern fighters like the Rafale, Eurofighter, Gripen etc cannot sustain flight at 60deg AoA. I know it’s no problem for the Gripen. It’s probably not so much the overall aerodynamics, even if it plays a part, but inlet design and the engines ability to continue working when it’s fed turbulent air. I remember talking to an SF37 Viggen pilot, he almost had a compressor stall when he accidently pulled more than 35 deg/AoA during a mock dogfight. So, the Viggens AoA limitation had to do with the ability of the RM8A, and not so much with the aerodynamics of the airplane itself, which probably stalled out at 36 deg/AoA. 😉

    in reply to: Most maneuverable modern non-TVC fighter? #2537872
    robban
    Participant

    I’d say the Gripen is one of the most maneuverable non-TVC fighters. It’s unstable canard/delta configuration makes for a good dogfighter. And it really shines in the supersonic region. The fact that it is small also helps alot. International excercises has shown that the Gripen has no problems taking on F-16’s and F-18’s in dogfights. It only falls short in sustained turning ability, but not by much. And this is most likely because of its modest T/W ratio.

    in reply to: to canard or not to canard #2537875
    robban
    Participant

    From what I understand, unstable canard equipped fighters has better control authority compared to an unstable aft-tail design. Instead of forcing the tail down decreasing overall lift, the canard lifts the nose, increasing overall lift. Also, a canard equipped plane can be built with a higher degree of instability than a conventional plane.

    Sweden chose the delta/canard configuation for the Gripen because it offered very low supersonic drag. Also, the canards in conjunction with the main wings slats and elevons offered excellent turning performance and low landing speeds.

    in reply to: FC-1 Prototype 04: the Saga Continues #2540216
    robban
    Participant

    The Mirage 2000 doesn’t have canards, it has strakes.

    There was a small discussion about it in this thread. http://forum.keypublishing.co.uk/showthread.php?t=63394&page=2&pp=30

    in reply to: F-104 Question #2541474
    robban
    Participant

    I wouldn’t say the was F-104 anymore dangerous than fighters of the same generation, especially if it was used in its intended role, intercepting bombers at very high speeds. Which it probably did better than the other contemporary fighters. What the F-104 had against it, is that it was probably too specialized. The Mirage, Draken and MiG-21 I think has proven to be more flexible in coping with changing threats.

    Just my opinion.

    in reply to: F-35A production PICS!! #2541479
    robban
    Participant

    My goodness. :rolleyes:

Viewing 15 posts - 271 through 285 (of 360 total)