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Which is more reliable for accurate speed indication in game?

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by Jammy25, Dec 31, 2018.

?

Which is more accurate?

  1. Air speed

    4 vote(s)
    80.0%

  2. Wheel speed

    1 vote(s)
    20.0%
  1. Jammy25

    Jammy25
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    Joined:
    Jul 27, 2018
    Messages:
    93
    Hi, Ive been making an automation mod called the McLarry P14, which is currently a package of 4 vehicles.
    the vehicle in question is the most recent version, the McLarry VELOCITY.

    This vehicle aims to be fastest automation vehicle with top speed 500mph in BeamNG.drive gridmap.

    In regard to this targeted speed, I'm not certain which speed reading to use; the airspeed reading or the wheel speed reading?

    I am unsure as a result of the obvious inflation on the wheels at 300+ mph which may skew the indicated velocity.

    Which is best to use?

    Apologies if this is not the right area to post this thread :).
    --- Post updated ---
    upload_2018-12-30_23-13-46.png upload_2018-12-30_23-14-30.png upload_2018-12-30_23-15-5.png
    Image 1) Air speed and wheel speed indications
    Image 2 + 3) ballooning effect from rotational force that may be affecting readings
     
    #1 Jammy25, Dec 31, 2018
  2. krallopian

    krallopian
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    NC114-85EKLS
    BeamNG Team

    Joined:
    Dec 5, 2013
    Messages:
    959
    Airspeed is ACTUAL speed related to still air on the ground. Wheel speed is just that - calculated based on the size of the tire/wheel and how many times it rotates.

    So it's apples and oranges but to answer your question, I always go by AIRSPEED so long as wind is set to 0. If wind speed is altered, your airspeed is no longer accurate without some math. But wheel speed can be zero even if you're moving 500mph =)
     
    #2 krallopian, Dec 31, 2018
    • Like Like x 2
  3. Diamondback

    Diamondback
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    Vehicle Systems Lead
    BeamNG Team

    Joined:
    Apr 8, 2014
    Messages:
    1,966
    To give you a technical answer: Wheelspeed is as already mentioned the wheel rpm multiplied with the wheel dimensions (with the correct units ofc) which can change depending on speed.
    Airspeed is actually "speed over static ground". Wind does not influence this in recent versions.
    However, if you were to drive on some sort of moving platform (like an aircraft carrier or similar) neither wheel nor airspeed would give you truly accurate readings.
     
    #3 Diamondback, Dec 31, 2018
    • Like Like x 1
    • Agree Agree x 1
  4. Jammy25

    Jammy25
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    Joined:
    Jul 27, 2018
    Messages:
    93
    Thankyou, I’ll bear these factors in mind and will from now on use airspeed whenever the top speed of a car is in question :)
     
    #4 Jammy25, Dec 31, 2018
  5. krallopian

    krallopian
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    NC114-85EKLS
    BeamNG Team

    Joined:
    Dec 5, 2013
    Messages:
    959
    The last time I used airspeed (I feel like it was only the last build) and I put it to say . . 200mph. . if I was GOING 200mph, it would read 0!
     
    #5 krallopian, Dec 31, 2018
  6. Jammy25

    Jammy25
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    Joined:
    Jul 27, 2018
    Messages:
    93
    I could try that in reverse, car going with the wind to crack 700mph
     
    #6 Jammy25, Dec 31, 2018
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