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X Degrees = Y G's??

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Clayton2318, Apr 26, 2016.

  1. Clayton2318

    Clayton2318 New Member

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    As I plan my rig, one question I keep coming across is the range of tilt. For example, when I have it tilt forward to simulate breaking G's .. is 10 degrees enough? Is 20 degrees enough? It all depends on how many G's I want to simulate - right?

    So I guess I'm wondering if there's some sort of equation I can use?

    My initial thought was that if I were to balance my car on it's front bumper at a 90 degree angle, this would be 1 G of breaking force - right? All of my weight would be on the seat belt holding me from falling on the dashboard / windshield. So, then is half that angle equal to half a G?

    90 Degrees = 1 G
    45 Degrees = 1/2 G
    30 Degrees = 1/3 G
    Clayton2318, Apr 26, 2016
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    A real F1 or fighter jet can generate between 5-10 sustained Gs.

    A motion simulator can at best momentary generate perhaps a tad over 2Gs.

    What a motion simulator does is a bit of a mind trick, it gives enough of the right kind of stimuli for the brain to fill in the gaps. VR does a similar thing with vision.

    Personally I consider speed is far more important to what a motion sim can do to trick the brain than Gs, followed by how many DOF it has to create the illusion.

    Here is a bit of an overview of speed needed for good motion: http://www.xsimulator.net/community/faq/speed-needed-for-good-motion.218/

    If you want to dig a bit deeper: http://www.xsimulator.net/community/faq/calculating-basic-linear-speed-and-forces.89/
    • Agree Agree x 1
    noorbeast, Apr 26, 2016
    #2
  3. BlazinH

    BlazinH Well-Known Member

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    15 to 20 degrees is usually enough for most people. We don't try to accurately simulate g's because its not possible (at least without a centrifuge based simulator). A varying tilt angle is simply a representation of varying G forces.
    • Agree Agree x 1
    BlazinH, Apr 26, 2016
    #3
  4. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    here is the difference
    • Informative Informative x 1
    RacingMat, Apr 26, 2016
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  5. SeatTime

    SeatTime Well-Known Member

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    Also depends on the type of rig you are building. With a standard 2DOF seat mover the center of rotation is under the seat (not really correct to simulate a car), which is not an issue for small angles/movements but will feel progressive more unnatural as the angle increases.
    SeatTime, Apr 26, 2016
    #5
  6. Clayton2318

    Clayton2318 New Member

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    Thanks, I guess when you go around a long bend you are experiencing mostly Sway (as your body wants to go one way while the car goes the other) and a little bit of Yaw? So I was think if you did a 2DOF simulator, you'd have to fake the Sway by doing Roll - right? I was just trying to do some simple math to see if it could even create anything worthwhile.

    I was interested in doing a simple 2DOF this year ... then maybe next year (or more likely the year after) step it up to something more complex.

    Thanks again,

    Clayton
    Clayton2318, Apr 26, 2016
    #6
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    A well designed 2DOF is surprisingly good at simulating sway, roll, pitch, surge and even heave, and is a great cost effective project to start experimenting with motion simulation.
    • Agree Agree x 4
    noorbeast, Apr 26, 2016
    #7