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Thread: AI aircraft front wheels sink into the ground.

  1. #1

    Default AI aircraft front wheels sink into the ground.

    Greetings,
    I have an AI aircraft and its front wheels sink in to the ground (see photo). This is not a swamp.
    All other AI aircraft on site function properly. Does any one have any ideas on where I can start to look for the problem? I assume it is in the aircraft.cfg file.

    [contact_points]
    point.0=1.000, -13.300, 0.00, -1.60, 2165.300, 0.000, 0.538, 12.00, 0.800, 2.500, 0.700, 0.000, 0.000,0.000000,0.000000,0.000000
    point.1=1.000, 1.50, -2.920, -4.50, 1968.500, 1.000, 0.512, 0.000, 0.400, 2.500, 0.700, 0.000, 0.000, 1.000, 0.000, 0.000
    point.2=1.000, 1.50, 2.920, -4.50, 1968.500, 2.000, 0.512, 0.000, 0.400, 2.500, 0.700, 0.000, 0.000, 2.000, 0.000, 0.000
    point.3=4.000, -13.300, 0.00, -1.30, 2165.300, 0.000, 0.538, 12.00, 0.800, 2.500, 0.700, 0.000, 0.000,0.000000,0.000000,0.000000
    point.4=4.000, 1.50, -2.920, -4.20, 1968.500, 1.000, 0.512, 0.000, 0.400, 2.500, 0.700, 0.000, 0.000, 1.000, 0.000, 0.000
    point.5=4.000, 1.50, 2.920, -4.20, 1968.500, 2.000, 0.512, 0.000, 0.400, 2.500, 0.700, 0.000,
    0.000, 2.000, 0.000, 0.000

    FS2004
    Thanks
    Jay
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. Default

    It would definitely be the contact points. I don't mess with contact points unless I really have to and I'm not a modeler. But this resource may help you. http://msdn.microsoft.com/en-us/libr...#mozTocId38401

    In there it should state what contact point means for what axis, etc.

    I also think there's another option in the CFG file for the spring tension or something like that.

    Edit -

    Here's the exact section you want. https://docs.microsoft.com/en-us/pre...contact_points
    Last edited by CRJ_simpilot; 03-07-2020 at 01:10 AM.
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  3. #3

    Default

    Thank you CRJ for getting me pointed in the right direction, a very good resource, spot on.
    Jay

  4. #4
    Join Date
    Sep 2006
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    Vale of the White Horse
    Posts
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    Default

    Could also be the C of G height, & I believe that AI aircraft undercarts do not animate so stay at extended length - could be wrong...Good luck
    Keith

  5. #5
    Join Date
    Jun 2013
    Location
    Flanders, Belgium
    Posts
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    Default

    Hi,

    If you mean static_cg_height, that only has effect in slew mode, as does static_pitch.

    This is what the numbers stand for:

    //0 Class <0=none,1=wheel, 2=scrape, 3=float>
    //1 Longitudinal Position (feet)
    //2 Lateral Position (feet)
    //3 Vertical Position (feet)
    //4 Impact Damage Threshold (Feet Per Minute)
    //5 Brake Map (0=None, 1=Left, 2=Right)
    //6 Wheel Radius (feet)
    //7 Steer Angle (degrees)
    //8 Static Compression (feet) (0 if rigid)
    //9 Max/Static Compression Ratio
    //10 Damping Ratio (0=Undamped, 1=Critically Damped)
    //11 Extension Time (seconds)
    //12 Retraction Time (seconds)
    //13 Sound Type
    //14 Airspeed limit for retraction (KIAS)
    //15 Airspeed that gear gets damage at (KIAS)

    I think there's an error in the main gear wheel radius setting (0.512). That entry is in ft. and it seems a little low, looking at the screenshot.
    Try changing that, but backup your aircraft.cfg first.

    Regards,
    DDP.

  6. #6

    Default

    Problem solved.
    Thanks to all for your contributions, it all helped with fixing this problem.

    What I have found so far:

    1) Download and read the “Aircraft Container SDK FS2004” is a must, especially the part on “Contact Points”.

    2) There are two distinct categories in the Contact Point chart:

    * “Contact Points” (vertical column #) - this range is: 0 – 1 – 2 – 4 – 5 – with no # limit. The first three points represent:
    “Point.0=” the front wheel or the tail wheel,
    “Point.1=” the left front wheel,
    “Point.2=” the right front wheel.
    I do not know what the other points are for.

    * “Contact Elements” (horizontal row #) – this range is: 1 – 16, only. They establish what element is being adjusted, e.g. #4 “Vertical Position” or #7 “Wheel Radius (see SDK list). It is important to not confuse the two numbering systems of Points & Elements.

    The “Elements” from left to right: (as per the SDK)
    1- Class <0=none,1=wheel, 2=scrape, 3=Skid, 4=float, 5=Water Rudder
    2- Longitudinal Position (feet)
    3- Lateral Position (feet)
    4- Vertical Position (feet)
    5- Impact Damage Threshold (Feet Per Minute)
    6- Brake Map (0=None, 1=Left, 2=Right)
    7- Wheel Radius (feet)
    8- Steer Angle (degrees)
    9- Static Compression (feet) (0 if rigid)
    10- Max/Static Compression Ratio
    11- Damping Ratio (0=Undamped, 1=Critically Damped)
    12- Extension Time (seconds)
    13- Retraction Time (seconds)
    14- Sound Type
    15- Airspeed limit for retraction
    16- Airspeed that gear gets damage

    Here is what it looks like in chart form:
    Jay

    Click image for larger version. 

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    Name:  Raised Wheel.jpg
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  7. Default

    Glad you got it fixed and learned a few things in the process. Now if you have this issue again you'll know what to do.
    My forum project. Click me
    OOM errors? Read this.
    Pick an Amazon wish list, help a child out
    From RLG, Fly heading 053, intercept 315 DVV, look for the orange glow of a SAM.

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