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SunSurfer

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Posts posted by SunSurfer

  1. 9 hours ago, TVR said:

    On a bright note, if all the climate people are correct, we will get to do more snowboarding....

     

    I am going to guess some might ask "What is he talking about? The earth is getting warmer won't help snowboarding". And, as a matter of fact, if the models some predict about warming are to come true, it will indeed get more snowy. 

    If it gets warmer, the ice melts. The melted ice adds less saline water to the ocean, which jams up the oceans conveyor belts.  Without these oceanic flows, it gets colder....  much colder... if fact, it happened a mere 12,000 years ago. When it gets colder we keep more snow and more tracks are made....   So there is a bright note here...

     

    I will let the scientists explain the conveyor belt, as they are better at this than I am...
    https://loe.org/shows/segments.html?programID=15-P13-00013&segmentID=3

     

    If you don't like my source, google "earth ocean conveyor belt" and there will be a source you like I am sure...

    Reading the whole reference I don't get quite the same impression as TVR. But it was an interesting read. Thanks for linking it.

  2. In the dark Southern climes of New Zealand, ski season has begun with Mt Hutt open with reasonable early season snow. Other fields not so blessed with snow yet.

    We increasingly celebrate Matariki, the Maori New Year, around this time of year.
    https://www.tepapa.govt.nz/discover-collections/read-watch-play/maori/matariki-maori-new-year

    Our Aussie cousins have the Dark MoFo
    https://www.darkmofo.net.au/program

    Personally, I'm making preparations for an August trip to Cardrona & Treble Cone ski fields, with a collection of boards, and a pair of carving skis. Have family & friends joining me for periods of the time away. Hopefully lots of GoPros etc.

    Aussie travel bubble with NZ has just popped, with a brewing Covid infectious Australian visitor last weekend to Wellington who was symptomatic at time of their return flight and tested positive soon after. That will impact a lot of Australian snow visitors for the school holidays (spread over about 3 weeks) that start in 3 days time. Local impact will become clearer over the next week or so.

     

  3. @philw
    Try biasing your bindings on wide boards so that your rear binding toe is close to the edge, and your front binding heel is close the edge. Works for me on my old Rad Air Obsession/Pinkerman Extreme and the board carves easily and flicks quickly from edge to edge.

    • Like 1
  4. On 5/12/2021 at 11:43 AM, Allee said:

    Glad I didn't get the Astra Zeneca shot. A friend of mine's wife got it, and got a pretty nice taste of the real thing - she was dog sick for 24 hours. The AZ and J&J ones seem to kick people around pretty good.

    While it's nice not to have any reaction and still get the immunity to the Covid virus, your sore arm, and your friend's wife's illness are both signs of the body recognising the vaccine material as "foreign" and producing a good immune system response to the vaccine. Remember, none of the vaccines you mention contain Covid virus. (Edit: AZ & JJ use an adenovirus to carry the "template" to make the antibodies to Covid)

    The Astra-Zeneca vaccine does rarely (estimates vary between 1-4 cases per 1,000,000 people vaccinated) trigger antiplatelet antibodies and the resulting blood clots and low platelet counts, which makes the risk-benefit ratio favour its use in older people (somewhere around 40-50+ years old) with a greater risk of severe illness or death from Covid.
    (Links below to newspaper, and New England Medical Journal original reference source)

    https://www.theguardian.com/world/2021/apr/13/astrazeneca-blood-clotting-what-is-this-rare-syndrome-and-how-is-it-caused

    https://www.nejm.org/doi/full/10.1056/NEJMoa2105385

    Update 13 May: JJ now also linked to same rare clotting and low platelet count problem.

  5. On 5/7/2021 at 4:44 PM, daveo said:

    @Jack M I know they are doing something with their front/rear mechs now for years- but what exactly does it do? I can't figure it out... Do you have any insight? I'm always curious about this stuff.

    https://fes-sport.de/

     

    Looking at the FIS SmugMug photos and applying some thought, I'd guess the Germans have made a sliding axle with enough slide to not constrain flex at the front end of their AllFlex plates. The effect would be to increase the flex in the front half of the board under the plate, while the rear half remains constrained.

    • Like 1
    • Thanks 1
  6. On 5/2/2021 at 5:02 PM, BlueB said:

    Super clean, all of it! And a backside 360 to finish it off - respect! 

    @daveo you didn't watch the 2nd video, to the end! Respect @NateW!!

    Edit: Hmmmm, maybe time for new glasses. That was not a deliferate mistale!

    • Like 1
  7. @Jack M

    I'll chuckle and take that as a "No".
    My thinking is that makers have core profiles and composite layups that produce a flex profile for that length that is in sympathy with a known range of sidecuts.  Ask for a sidecut outside that range and you're heading into unpredictable territory.
    Watched a YouTube video of a computer guided ski core sander.
     A modified core would be a whole new code task and unknown performance. Hence the caution

     

     

     

     

  8. @Jack MDid you discuss with Hansjuerg Kessler how the board flex might be adjusted, or was the discussion purely around sidecut?

    The whole point of this thread, and the point that I made at the beginning, and John has made just above, is that SCR is the major determinant of turn shape only at shallow board inclination angles, and flex rapidly increases the contribution it makes so that it forms the majority of turn shape geometry at angles above 45 degrees.

    SCR is easy to design, and relatively easy to change. Flex, as we've discovered, is a much more difficult beast to tame. You can really only find out the flex pattern once you have the fully asembled board. And yet it would seem that getting a sympathetic relationship between the two properties is the key to getting a well performing board

  9. @johnasmo
    Thanks, that relationship between sidecut/board inclination angle/flex all determining turn shape, with the inclination angle changing the share the other 2 factors contribute, is the concept where I began this thread.

    I'm starting to get a clearer picture of the forces that make a board flex, and the desirable flex patterns in the front, midsection (between bindings or outermost plate attachment points). I still don't have a sense of what is desirable in rear section flex.

    @johnasmo & @dredman
    watching the Whitefish videos, John tends to begin his turns with a little sideways kick of the tail, and to my eye seems (correct me if I'm wrong) to ride the tail more in his turns. David seems to ride more balanced over the centre and begins his turns just by engaging the edge and rolling onto it.

    Does this difference in style translate into different perceptions of the tail flex goals with the boards you ride together, and then compare notes on the chairlift?

  10. @slapos If you're looking for a binding & cant calculator for Bomber bindings search for

    TrenchGear3D

    in the Google Play store.

    The app shows the results of combinations of binding angles and cant disc angles.

    The old Tweakomatic page at the Carvers Almanac - Binding Setup section seems to have stopped working.

     

  11. 3 hours ago, Jack M said:

    So I'm a convert, but I still can't quite get my head around why it works.  An Allflex plate basically creates three separate zones of flex in your board: nose, mid, tail.  I disagree with that design in theory, but I like it in practice.

    @Jack MAbsolutely, I can't get my head around why the basic design works, but also what the variants (springs/plate underside rib designs) contribute to the overall performance. Board flex limitation is a unique design feature. The total amount of board flex in the mid-section in use would seem to be a function of the plate flex pattern.
    The long inter-hinge distance (70+cm) creates a very long midsection where torsional stiffness is presumably very high. Presumably the spring versions allow effective rider input to the board mid-section torsion/twist in race courses where slide/carve turns are a necessity, or it benefits their particular riding style.

     

  12. @daveoNot necessarily all the secrets. Some of us are still trying to identify which of the various design features of the AllFlex plate design(s) are responsible for it becoming the GS racers current favourite.

    Isolation / separation of board from rider

    Long distance between board attachment points

    Limiting the amount of board flex before the plate must also bend in order for further board flex to occur.

    Splitting front and rear of plate, with spring controlled resistance, potentially allowing the racer to manage mid section torsion of the board.

    Variation in plate flex characteristics due to different rib patterns on the underside.

    Greatest popularity with GS racers on their boards.

  13. @johnasmo

    Is this the kind of thing you're talking about with TR playing a role in the ride feeling harsh, that too much TR can be a problem. These guys seem to be saying the same thing with skis. Not sure if the English translation captions turn on automatically, otherwise your Swedish better be good. (At least I'm assuming it's Swedish, now I relisten sounds like might be German)

     

     

  14. https://www.dyfiospreyproject.com/live-streaming

    A Welsh osprey hatching site, established pair, return to their nest in early April after overwintering in Africa (probably Senegal). 3 eggs just laid for this season and the chicks will hatch and fledge over the next 5 months. The site is immediately next to where my wife stays when she is in Wales as part of PhD research, and about 5 miles from the Atherton Dyfi MTB park, and Dyfi Forest MTB area. 

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