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About Ryan..

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    Sailing, Skiing

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  1. Interesting thanks for the lede I was thinking about a rectangular header such as that, but with "skateboard wheel" type rollers on all 4 sides, a series of them on up.. trick is to make it serviceable though. hmm...
  2. Thanks much Hump, sounds like it may be a dead-end
  3. I would like to build bearings for high aspect boards that'll take around a 5ton+ load, that will allow for very easy raising lowering under load. Without the need for electric winches or hydraulics, if at all possible. Searching around for examples , finding mostly machined bearings from branded polymers, uhmwpe etc. but not finding any ball bearing or roller bearing style examples. Anyone have experience on the pro's and con's of building in roller style bearings for trunks?
  4. Instead of attempt to answer the question asked, idiots will make numerous assumptions about what you are thrying to do, and spew whatever dogma of the day the sheep are flocking to, providing no value to anyone except trying to make themselves feel smart
  5. you are a bit slow. we are not building aircraft but boats, very different environment, very different scantlings
  6. Seems everyone wants to argue fiberglass is better than carbon, rather than answer the question. I already have access to carbon and ... "19mm H80 foam 1.5 kgs per sq m,with average of 450 gsm carbon (1.8 kgs/sq m) each side it would weigh (1.5+1.8+0.5 (wet out the foam) = 3.8 kgs per sq m. Replace the carbon with twice as much glass, it would be 1.5+1.8+1.8+0.5= 5.6 kgs/sqm. Difference on 126 sq m is 227 kgs..." but found the answer to my question. 1/2 x glass or thereabouts so will just use glass scantlings, thanks you can carry on convincing yourselves fiberglass is better
  7. I've helped build aircraft.. quite familiar with the various build options, but you may have noticed, boats travel on water not air. Let's not compare apples to bananas If carbon was the same cost as glass, most boats would be made from carbon. But you go ahead and build in floppy fiberglass. That was not the question
  8. May want to let the AC builders know that secret, would save them huge
  9. Assume 60/65% fiber volume fraction. We are able to guess just fine with fiberglass scantlings .. all I need is 3 variables to get skin thickness for those.. why would carbon be any different ?
  10. Seems logical. There are most certainly some rules of thumb or scantling calcs, on these as there are with fiberglass or wood etc.
  11. I'd like some of what you're smoking If you don't know the answer it's ok to admit it
  12. yes, agreed, it should be engineered, eventually, but when doing preliminaries on costs, best methods etc. scantlings or other rules of thumb are useful. Could not find scantlings on carbon sandwich, maybe I didn't look hard enough. >0/30/30 at about .012-.015" per layer, vaccuum bagged & cured Thanks. This helps. So around 1mm? from the 0/30/30 assuming the zero is most critical (depending on bulkhead spacing)
  13. Anyone have an idea of the approximate carbon fiber skin thickness for a 60ft-80ft catamaran hull, over 1 inch? 5lb density pvc core. In the general non-reinforced areas, hulls and deck Thanks
  14. You are deliberately twisting facts sidecar, try keep your little bitchfests to your slumber parties with Russ Bucket list was a prototype idea, that was never built (except a rough prototype) you already know this. I guess if you don't really innovate you are not used to the concept of a prototypes? Cargo proa is also a 1st version prototype commissioned specifically for testing, and is under construction so don't be a fool and take a strong position on something you don't understand. The Malborne proa was modified by the owner/builder for shallow water... special application
  15. May want to learn a bit about balance before attacking other peoples designs. Figure out where the vector is pointing for the center of effort and where the center of resistance will be, that will give you the lever arm and the distance from it. Do some basic trig to get the force perpendicular to that. Most proa designs are badly balanced (including sidecar), all pacific proas will loose performance to the rudder fighting this imbalance. Atlantics will be better balanced. Newick was smart... it seems he mostly figured it out first go. Probably why cheers (Atlantic proa) placed 3rd in a trans
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