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Recent content by Mr J

  1. M

    Varial RIP

    PU blanks are fairly low tech. The raw chemical materials can be combined into two separate liquid mixes and stored. When they are mixed it is "self blowing" (my terminology) because the cross linking agent isocyanate foams when it kicks off the polymerisation process. The liquids can be mixed...
  2. M

    Varial RIP

    yeah, I think hydroflex started off as Bufo surfboards from Germany. XPS foam that had the fibreglass lam punched into the foam at intervals (or something like that). I think this demo exaggerates how strong it is - rigged with 12oz glassing :LOL:
  3. M

    Varial RIP

    that is a good thing to do with any stringerless blank, particularly if they were thermoformed rocker with springback issues like Sharky was saying.
  4. M

    Varial RIP

    That's what I was told anyway by the shop that sold it to me - a place which did a lot of aeromodelling supplies. So XTR use the blue coloured from DOW? I would have thought they would use white or grey XPS for cosmetic reasons. There are a number of manufacturers of XPS - Owens Corning is the...
  5. M

    Varial RIP

    ok, so I was on the right track when I first suggested that rectangular slabs thick enough to accommodate rocker were being supplied. I also said "or maybe as Sharky alluded to, they are thermoformed - needs a high temp to avoid springback, doesn't sound cheap. " So Evonik say it can be...
  6. M

    Varial RIP

    or maybe as Sharky alluded to, they are thermoformed - needs a high temp to avoid springback, doesn't sound cheap.
  7. M

    Varial RIP

    I've never seen a varial, so based on descriptions of the foam it might be SAN or PMI (Styrene acrylonitrile or Polymethacrylimide), brand names Gurit Corecell, Evonik Rohacell and CA composites PMI, The lowest density of Corecell is 65 kg/m3 which is 4.1 lb/ft3 so too heavy for a blank. The...
  8. M

    How many surfs before you ditch a board?

    cure temperature rather than length of cure more important for epoxy. Take the boar home and keep it somewhere warm for at least a few days. This is likely to yield better results than a cold cure over the course of say a week. Those timeframes are just ballpark guesses and how I would treat a...
  9. M

    FLOW BAR Invented by a surfer, for surfers

    when full body weight is too hard for whatever reason I think some form of assistance is a good idea. The last month and a half I've been working on pistol squats which are impossibly difficult for me without assistance. I don't think that device would help with those - resting my hand on a...
  10. M

    *** Official Rip Curl Bells Beach Pro Contest Thread ***

    yes, they finished and the commentary mentioned the better swell prediction that will be arriving wednesday. Tide became too deep for the bowl on that meagre swell. They must have their reasons for not letting it continue at Rincon which can be good small wave surf at high tide.
  11. M

    Lower Back Pain

    @One-Off so your QL version is just like that but leans sideways? Efficient stretch in that it does a lot of things in one pose. The triangle stretches the abductor which helps put sideways load on one QL without much bending of the spine. I have never been prescribed neck stretches
  12. M

    DHD MF Eclipse

    Available to order in your size?
  13. M

    DHD MF Eclipse

    @casa_mugrienta yes, the vast majority of boars I see are either local brand in close proximity to where they are built or the big brands in plain PU/PE. I've seen two Albums, one a couple of years ago and the other more recently. I spoke to one happy Album owner in the carpark because we had...
  14. M

    Lower Back Pain

    @One-Off I was given those exercises on an instruction sheet and they weren't named. I just looked up your exercises and one of them does seem to be the cat cow. The other one is not a bridge - upper back and rear pelvis remain on floor as lower back moves gently off the ground. Only pelvis...
  15. M

    Lower Back Pain

    I had to look up QL - its an abbreviation for a pair of back muscles. I looked up a QL bend and saw a youtube of someone standing with a dumbell in one hand and bending sideways. I discovered that I have inadvertently been exercising the QL muscles - the yoga triangle pose. A difference between...
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