Bart_'s latest activity

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    Bart_ replied to the thread vertical speedline size/weight limits.
    I remember when I first saw Matt's cart up an incline groundie that I wondered about the creation of the big, largest(?) first load...
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    Bart_ replied to the thread Nerd Alert.
    I knew I saw it somewhere. I finally relocated Coach Stribeck's ;) presentation of his graph. Warning, for some this never happened...
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    Bart_ reacted to Muggs's post in the thread Nerd Alert with Like Like.
    @Bart_ I realized another factor with pulley efficiency many years ago when setting up a climber zipline, and that is, small diameter...
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    Bart_ replied to the thread Nerd Alert.
    As a kid we were building upside down "slider chopper" trikes, bicycle trailers and such. It was cheap junk, no bearings, all bushings...
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    Bart_ replied to the thread Nerd Alert.
    Rope Bend Losses or Bushing Friction Losses These two factors both undoubtedly contribute to losses that create the tension ratio of a...
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    Bart_ replied to the thread Break test on a climbing line that has been “spiked”.
    Seems like too much to me - 10% and 25% losses on parts of the rope being ok (Ghostice's Samson link). Based on that a spiking doesn't...
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    Bart_ replied to the thread Nerd Alert.
    Porta-Wrap Calibration Been scratching my head on this since a thread on porty nomenclature came up. As a device the porty is a pure...
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    Bart_ replied to the thread Portawrap minimun wrap, add'l wrap nomenclature.
    One other aspect - Dynamics Let's take an example porty that works a bit better than the BMS at 2 1/2 wraps - let's say it achieves a...
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    Bart_ replied to the thread Portawrap minimun wrap, add'l wrap nomenclature.
    I found this in a 2023 post of mine: " Courtesy of Kenny I'm more aware of the non-linear nature of wraps. They're exponential. A...
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    Bart_ replied to the thread Love tree work. Not the tree business..
    I'll bite. Which vaccine causes which cancer? HPV vaccine causes cervical cancer? Only connection I've heard. Smoke byproducts and...
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    Bart_ replied to the thread Portawrap minimun wrap, add'l wrap nomenclature.
    All my first double whip lowering was done off natural crotch and stubs. It seemed inescapably logical to do. Then I realised you...
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    Bart_ reacted to southsoundtree's post in the thread Portawrap minimun wrap, add'l wrap nomenclature with Like Like.
    When I am not cutting And catch/ lower/ landing the 'work', my common plan is for the groundworker to catch the load, them pass the load...
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    Bart_ replied to the thread Portawrap minimun wrap, add'l wrap nomenclature.
    Chart might have been Dan Thornton. Wasn't Treespyder. Maybe on a BMS spool thread.? Spool has three different wraps settings whIch I...
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    Bart_ replied to the thread Portawrap minimun wrap, add'l wrap nomenclature.
    IIRC someone posted a chart of tension ratio (weight of log / pull force at groundie's hands) for different porty wrap configurations...
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    Bart_ replied to the thread Courant Kalimba.
    I once R+D'ed pure parallel fiber "tendons". Holy no stretch Batman. Spectra, vectran and kevlar. Nothing wanted to "glue" to the...
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