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Thread: Are these the best and cheapest Recovery Point ever designed????

  1. 20th April 2015, 04:26 PM #11
    Islandnomad
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    It's a rated connection that works according to the manufacturers.
  2. 20th April 2015, 04:32 PM #12
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    clubagreenie
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    BTW, give me a link to a grade 8+ rated HT wing nut pls

    Because CAD full of stds for fasteners doesn't have one
  3. 20th April 2015, 04:36 PM #13
    Islandnomad
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    I'm no expert, if a wing nut doesn't work then a nut. Just saying...
  4. 20th April 2015, 04:56 PM #14
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    clubagreenie
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  5. 20th April 2015, 07:22 PM #15
    Islandnomad
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    "When they fly off" how are they flying somewhere?


    Because "snatch straps" ?? Please explain?
  6. 20th April 2015, 07:47 PM #16
    carneeki Guest
    Quote Originally Posted by Islandnomad View Post
    "When they fly off" how are they flying somewhere?
    Bro, do you even

    1. CAD model?
    2. Finite element analysis?
    3. Understand basic principles of pressure, force, mechanics, and tensile strength?
  7. 20th April 2015, 07:48 PM #17
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    clubagreenie
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    Sorry for the delay in replying. Been a bit busy...



    Basic model of plate, 2mm HT Steel.



    Side view of plate, under 5000kg load.



    Red area is 9.534mm PLASTIC (permanent) deformation.



    Just for interest loaded at 90deg.

    And here's a replacement rear bar for a D2, winch mount. Loaded at 20tonnes. Mounted to original bar mount and two rear crossmember tow bar bolts. 6mm plate steel, HT bolts and capscrews.

  8. 20th April 2015, 07:50 PM #18
    carneeki Guest
    ^-- Like that.
  9. 20th April 2015, 07:52 PM #19
    Islandnomad
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    I'm impressed mate! So at 5000kg it deforms but doesn't shear? So its a pretty strong bit of kit isn't it?
  10. 20th April 2015, 07:59 PM #20
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    clubagreenie
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    Then you're easily impressed.

    Thats 5000kg static slow applied load. There's far more at play than a simple FEA test. THAT result is in no way reflective of a pass. Given that there should be 2:1 margin after safety factors of (used for say climbing equipment) of 5:1. At 5000kg there should be zero deflection. Put a snatch strap on that and it's a deadly missile waiting to happen, they will apply easily 3 x actual load and probably more depending on the strap itself.

    The bar in the last pic at 20tonnes has 7mm of total deformation. Most of that is in the eyebolts (5mm) and they're only 2tonnes (at the moment). Their deformation is also plastic, the bar movement is elastic. And we haven't put an additonal reinforcing plate behind the bolts which will remove the face deformation. But also needs to be balanced with not being too rigid.

    What surprised me is the strength of the OEM outer chassis mounts.
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