EarthBM

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About EarthBM

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    Corona Del Mar, CA and Deerfield Beach, FL

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  1. EarthBM

    Dragonfly 40

    + CF mast (already was) and boom (instead of alu). Dyneema waterstays (with smart splice or lashings to adjust for creep, or just a simple turnbuckle). And whatever else gets it under 3.5 tons
  2. EarthBM

    Dragonfly 40

    CF beams, plastic fuel tank (or some Oceanvolt system), synthetic stays, LiPo batteries...
  3. EarthBM

    Dragonfly 40

    They are pretty nicely made, like “yachts”. But weight = death in multis. I could identify at least half a ton of gratuitous weight in my df35. Can replace 90% of stainless steel stuff (incl the diesel tank, waterstays, etc) with hi tech synthetic stuff. Thick glass fiber everywhere, even in no-load areas. Quorning should offer a “light” version, with hi-tec cloth/synth interior instead of wood, CF beams, etc. I bet more of those will sell. I’d buy one.
  4. EarthBM

    GB5508 Rebuild - Soma's Project

    Was there any weight saving in the switch from diesel to Mastervolt? is there a genset to maintain range?
  5. EarthBM

    Dragonfly 40

    Changing the size and making ama bows look sporty by inverting them ever more is fake innovation. They need some radical changes to lighten the boats.
  6. A perfect So Cal boat. Should be fast in light winds. And probably still can find single slips that can fit 16’ beam.
  7. (Reality of course is probably 1000kg and $100k more than that)
  8. I think the logical outcome of the “$$$ rule” would be that the design should be an optimal balance across multiple dimensions: - If I am indifferent between the choices of marginally increasing my LWL or beam, then the dimensions are in balance. I think it would be something like 40x34. - If I am indifferent between spending my next $10k on using more carbon in a 40ft tri or on extending LWL by 1ft then the carbon content is about optimal. I suspect this means very little CF (mast, maybe akas, or more likely just some structural components). - if I prefer spending $10k on adding ama foils to extending LWL then they belong in the design, otherwise not (I suspect not, because they probably need all carbon ama structures) - taller masts are a relatively cheap way to boost performance so probably should be limited to “tall enough” 70’ or so to avoid the death race. - T-rudders seem like a low cost performance add. Bowsprit. - rudders in the amas vs high aspect ratio vaka rudder - again cost trade off (or just owner preference) Think Class 40 monos is a good example to emulate. They are seaworthy, can be cruised, have accommodations, with reasonable limits on carbon. I would mandate 4-5 berths, minimum fresh water tank, one head, standing room in most of the cabin to increase offshore autonomy and commercial appeal (think resale values). So basically Corley’s Kurt Hughes design but with 34’ beam... if this can be made to true 2000kg displacement (I know a couple of Kurt’s tris that turned out way over designed weight) and inside $250k with sails quite a few will get sold and form a good class.
  9. EarthBM

    Near Capsize

    Nice! How did the lifeline get in the which? was the main again the spreaders?
  10. Well yeah, if a random box rule limits you lwl but not beam, more beam may incrementally increase stability. I don’t know what a good rule for a class is. Was F40 multi class successful? Mono Class 40 seems to be. I guess the best rule would be $$$ - sail (race?) with what you can spend max $100k on. and for my $$$, if I start with a square tri, adding lwl would bring the most marginal begefit.
  11. The next step is sailing my Dragonfly 35 from LA to Panama and up to Miami (or selling it and trading up).

  12. Stumbled on this topic searching for something else... On the square dimensions.. A square trimaran is not symmetrically stable because the buoyancy at the bows is a fraction of the buoyancy at the amas. So it's much easier to pitch pole it than to flip sideways. As most ORMAs have discovered. Don't think this depends on size, except that for beach cats and the Wetas the crew weight can compensate for that by sitting way aft when going downwind. If you are in the death zone, buried the leeward ama, released the main and are falling off the wind the square design feels wrong.
  13. New mast and sails coming I hear, the boat is for sale
  14. EarthBM

    Caribbean 600

    How would the windward board help? (Edit: instead of lee board! Got it!) For the leeward board I imagine it’s an advantage of curved (edit: or angled) boards — they slip more at higher heel angles.
  15. EarthBM

    Caribbean 600

    another note to self: relocate the ditch bag to the ama hatch. With big multi capsizes relatively rare, any nuggets of info are gold. Thanks!