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Question Traction Loss Pivot Point Location

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by FlimFlam, Dec 31, 2021.

  1. FlimFlam

    FlimFlam New Member

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    Recently, I have become interested in creating a 2 DOF + traction loss rig to upgrade from my motionless one. I've been scouring this forum trying to envision how I might put that together and I would likely aim for a compact design for the 2DOF, if I could find a reasonable source for the motors (pgsaw from Ebay Canada has an empty storefront at this time). I would like to keep my GT Omega Apex stand if possible, but the pedal plate kind of gets in the way in terms of a traction loss design as my understanding is the pivot point should be roughly under the feet or even further forward (A in the picture). Would it be a reasonable alternative to put the pivot point under the knees (B) instead? Would appreciate any advice!

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    FlimFlam, Dec 31, 2021
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    TL does not just require a front pivot, but also rear rollers, so there is no real reason for not having the pivot near your feet, as the whole frame is required to be raised a little so it can rotate to simulate the rear end breaking loose, with lazy susan or bearings taking little space, see the FAQs here: https://www.xsimulator.net/community/faq/traction-loss.174/

    A pivot near your knees is not really TL, nor is it really yaw.

    Your rig has plenty of room for a pivot near the feet, under the angled pedals.
    noorbeast, Dec 31, 2021
    #2
  3. FlimFlam

    FlimFlam New Member

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    Thanks for the reply! Your compact rig is a great inspiration! My intention was actually to just move the seat and not the entire platform, and I was hoping to use the existing frame as a base for a chair frame with a front pivot and rear rollers. But it's good to know that the under the knees location is not an ideal pivot point.

    If just rotating the chair and not the entire rig is reasonable, I can give some thought to a frame shape that can pivot from the point A and also pivot between the 45 degree angle steering wheel mount bars.
    FlimFlam, Dec 31, 2021
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Rotation around a central point, say rotating the seat like an office chair, is yaw, which is a valid but different axis effect to TL.
    noorbeast, Dec 31, 2021
    #4