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Thread: Aircraft Porpoising

  1. #1
    acva008 Guest

    Default Aircraft Porpoising

    Does anyone know what causes and aircraft to porpoise (nose bucking up and down) and how to stop it?

  2. #2
    Join Date
    Mar 2005
    Location
    Westminster, CO
    Posts
    7,531

    Default RE: Aircraft Porpoising

    What aircraft are you using? What altitude, speed, other conditions? In the air or on the ground? I've seen it in a few add-on aircraft, usually at high speeds. It usually requires modification of the .air file

    Larry N.

    https://www.flightsim.com/images/noimage.png

    Larry N.

    As Skylab would say:
    Remember: Aviation is NOT an exact Science!

  3. #3
    Join Date
    Mar 2005
    Location
    Napier, New Zealand.
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    Default RE: Aircraft Porpoising

    Click on banner at top of page.

    Trevor :-)
    Intel i5-2500K 3.3GHz Quad Core, Asus P8Z 68-V LE MB, Asus Strix GTX 960 gb graphics card, Windows 10 Home 64 bit, 8gb Corsair Vengeance DDR3 ram , Viewsonic VX2452mh LED 1080P HD Monitor. Seagate Barracuda 1 TB 64MB Sata3 HD, 650 watt Corsair PSU

  4. #4
    jboy Guest

    Default RE: Aircraft Porpoising

    >Click on banner at top of
    >page.
    >
    >Trevor :-)

    No, actually in the 737 and 777 the Yaw/Damper switch seems to correct this problem VERY well. Just turn it off after decending through 10,000 so as to not interfere with your ILS landings, which it seems to do.



  5. #5
    acva008 Guest

    Default RE: Aircraft Porpoising

    the aircraft was an airbus A320 en route from toronto to sanfrancisco.
    35000 feet and 290 KIAS

    changing speed and altitude didn't seem to help

  6. #6
    Whiteman Guest

    Default RE: Aircraft Porpoising

    [font size="1" color="#FF0000"]LAST EDITED ON Jan-18-02 AT 04:40AM (EDT)[/font][p]"No, actually in the 737 and 777 the Yaw/Damper switch seems to correct this problem VERY well. Just turn it off after decending through 10,000 so as to not interfere with your ILS landings, which it seems to do"


    I'm glad that appears to help with those aircraft, but why should that stop the original poster clicking the link?

    There's no mention of the problem relating to either of those aircraft and the problem is a common one which isn't always solved by the yaw damper.

    John

    https://www.flightsim.com/images/noimage.png

    http://flightsimvetclub.tripod.com/

  7. #7
    ifr0 Guest

    Default RE: Aircraft Porpoising

    try flying at 30,000 instead of 35,000 and see if that helps
    https://www.flightsim.com/images/noimage.png

  8. #8
    RickK Guest

    Default RE: Aircraft Porpoising

    [font size="1" color="#FF0000"]LAST EDITED ON Jan-18-02 AT 11:11AM (EDT)[/font][p][font size="1" color="#FF0000"]LAST EDITED ON Jan-18-02 AT 11:10 AM (EDT)[/font]

    I had this same problem with a converted FS98/2000 Boeing 757 model used in FS2002. It would porpoise under autopilot at all speed settings and altitudes. I went into the aircraft.cfg file for the model and under the flight tuning section changed the line for pitch stability from 1.0 to 1.5

    (flight_tuning)

    pitch_stability=1.5


    Worked great. Very stable now.

    Rick

  9. #9
    acva008 Guest

    Default RE: Aircraft Porpoising

    To all who replied:
    Thanx a million guys for your quick responses..They certainly helped out in a big way..
    Pete

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