Results 1 to 3 of 3

Thread: Nosewheel steering traction

  1. #1
    Join Date
    Mar 2005
    Location
    Middletown, DE, USA.
    Posts
    1

    Default Nosewheel steering traction

    OK Gang - First request for technical assistance

    I am flying Marci Spada's P-3 Orion, ORIONK4.zip. In general, it is a good flying aircraft, but I have noticed one very odd ground behavior characteristic that needs some attention. The Nose steering system appears to have a very low traction coefficient which causes the aircraft to understeer during medium speed taxi operations. I can use differential braking to help minimize this impact, but I have a reasonable expectation that tires should have positive traction unless excess speeds are incurred. Here's the technical data on the contact points:



    //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)
    [contact_points]
    //my entry 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
    point.0 = 1.000, 30.000, 0.000, -8.200, 3000.000, 0.000, 1.100, 40.000, 0.200, 2.500, 0.900, 4.000, 4.000, 0.000, 0.000, 0.000
    point.1 = 1.000, -2.000, -16.000, -8.700, 5000.000, 1.000, 1.500, 0.000, 0.300, 2.500, 0.800, 4.000, 4.000, 2.000, 0.000, 0.000
    point.2 = 1.000, -2.000, 16.000, -8.700, 5000.000, 2.000, 1.500, 0.000, 0.300, 2.500, 0.800, 4.000, 4.000, 3.000, 0.000, 0.000
    point.3 = 2.000, 0.000, -50.240, 2.100, 1200.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 5.000, 0.000, 0.000
    point.4 = 2.000, 0.000, 50.240, 2.100, 1200.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 6.000, 0.000, 0.000
    point.5 = 2.000, 43.200, 0.000, -0.040, 1200.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 9.000, 0.000, 0.000
    point.6 = 2.000, -60.690, 0.000, 4.850, 1200.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 4.000, 0.000, 0.000

    max_number_of_points = 21


    static_pitch = 0.000
    static_cg_height = 8.600
    gear_system_type=1 //Hydraulic

    [gear_warning_system]
    gear_warning_available = 1 //Normal
    pct_throttle_limit = 0.1 //Percent throttle that activates warning
    flap_limit_idle = 15.0 //Flap angle that activates warning at idle
    flap_limit_power = 30.0 //Flap angle that activates warning at above idle

    [brakes]
    parking_brake = 1 //Parking brake available
    toe_brakes_scale = 1.06 //Brake scalar

    I know from my own personal experience as a P-3 Orion Structures mechanic who turned a wrench or two on the P-3 NWS, the model is visually correct for steering angle, it just seems thet there's not enough traction in the tires. The CG slider is within limits and this occurs accross the fuel weight spectrum.

    I look forward to all the advise you can give. I've never messed with aitcraft CFG files, but I know that quality editing yeilds a quialty product.
    Thanks
    DeskFlyer_inDE

  2. #2
    prowler3 Guest

    Default RE: Nosewheel steering traction

    "Understeer"??

    Y'all mean she's "pushin'"...right? LOL...sorry, couldn't resist (NASCAR!).

    Being as the CoG is good, and not knowing of any "traction" setting, you COULD try adjusting "point.0" setting #8 (nose wheel max angle), which you currently have as "40.000" to a higher number (try 50,60) and see if that has ANY effect on the actual turn radius. I just adjusted a 727 from 45 to 60 and it solved a similar problem.

    You can always return it to the original, if it doesn't help.

    Vic

  3. #3

    Default RE: Nosewheel steering traction

    Hi,

    The simplest way to fix this problem is to move the main gear (lines #2 and 3) back a bit. This will put more weight on the nose wheel and improve its coefficient of friction.

    Try changing the -2.000 values to something a bit lower, like -3 or -4. Don't change them any more than is necessary though, because it may make the plane harder to rotate at takeoff.

    Hope this helps,

Similar Threads

  1. Replies: 2
    Last Post: 09-25-2005, 12:56 AM
  2. Nosewheel steering
    By BickBz in forum FS2004
    Replies: 5
    Last Post: 01-24-2005, 04:14 AM
  3. Replies: 12
    Last Post: 04-25-2004, 09:57 AM
  4. AIRPORT TRACTION
    By LAWINGE in forum FS2004
    Replies: 9
    Last Post: 08-21-2003, 07:51 AM
  5. nosewheel steering
    By everettbailey in forum FS2004
    Replies: 1
    Last Post: 07-27-2003, 10:54 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •