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108 F'n Saint

About boardhead

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    Pennsylvania, US.
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    Travel,Boats and Sailing,Making all manner of stuff go faster, more efficiently.

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  1. boardhead

    Faster ama shapes

    I have a very good friend who also loves his F28R which we have tinkered with, mostly associated with the rig and sails with good success. He mostly sails singlehanded - but not alone - so lacks the movable ballast that a crew provides meaning that the platform has to perform unaided. He might be up for some experimentation. Certainly plenty of buoyancy and planing surface on that structurally challenged hull form Sidecar shared, big departure from the stock amas but might be the ticket! The folding feature may be compromised, I need to eyeball my buddy’s boat on the trailer and mock up the potential. We can continue to bs on this thread but will not be able to do anything real for a couple weeks - heading out on vacation. Can you share a fly-by of the plans for a cursory look?
  2. boardhead

    Faster ama shapes

    Now we’re talking!
  3. The halyard can be run through a clutch, then past a cleat, round a turning block back to the winch. Hoist to desired position, clutch (they don’t hold shit and are not even very strong but can secure the unloaded halyard), take the line off the winch and make it down on the cleat, release the clutch and apply downhaul. The cleat is gentle on your expensive, high tech, halyard. It is secure. It can be eased under load without any damage to the line and re-secured at any increment. Way more convenient to use. That single stud anchor on the spliced loop is questionable.The line can be set at any length, those fixed length cables will be tough to size spot on. Are we still talking about this Grainger?
  4. boardhead

    Faster ama shapes

    Thanks Bruno but, to be clear, the requirements of a trimaran ama are quite different from those of a catamaran hull so, with due respect to all that have provided data for both sailing and motorized (oar/propeller) catamaran hulls, that is mostly irrelevant. Additionally, the ama shape, particularly in the after sections, will be quite different for a single center hull or ama stern mounted rudder configuration. My interest lies in the single center rudder set up which is what I chose on Skateaway. Designed in 1987 the boat remains mostly valid today and to my mind the greatest potential for improvement lies in the amas. I have no interest in C foils (which could relatively easily be installed in the existing amas) rather a different and perhaps quite novel ama design. I believe the majority of the Farrier range could benefit from a similar modification and a smaller bolt on ama represents a less expensive test bed. Ideas? Interest?
  5. boardhead

    Faster ama shapes

    I guess this is not a great spot for creative thinking.
  6. boardhead

    Faster ama shapes

    Boat is leaning a lot and the ama is providing float but not a lot of lift/speed. At least the guys are in the cockpit letting the ama do it’s job. I have sailed on the Diam 24 in decent breeze and witnessed the ability to pierce through chop at 18+ but we were three guy’s totaling maybe 550 pounds all the way out on the weather ama. I was in the middle on the main sheet easing off the tip of the main when the boat stuffed and decelerated, hauling back in with all I have on the fine purchase as we took off again. Lotta fun! All state of the art but is there a shape to keep the boat flying without the close attention and acrobatics?
  7. But would a much faster 35 footer been worth the extra drive?
  8. Now come on Wess - are you gonna disassemble that puppy and trail her out west for your PNW cruise!
  9. My first guess at the method back in May did not anticipate any change in the geometry between the ama and the aka rather a variation on the geometry of the struts and pivotal points on the inboard end of the ama to the vaka attachment. That arrangement would have been simpler but at the expense of greater intrusion of the akas across the vaka deck. Now we see, as you point out, a secondary pivotal attachment between the amas and akas. The outboard end of the beams curve downward into wells in the amas with, I would guess, a pivot pin at the tip near the keel and secondary pins sliding in radial grooves set in the faces of those well bulkheads just below deck level. I am almost certainly off on the details but that’s the concept, smart but calling for quite a lot of precision engineered parts that even with careful material selection will be shorter lived and less reliable than a rigid attachment - and much heavier. Anyway, Paul has been teasing us since he announced the “no crud on the topsides” system, the finished product will reveal the details but I would not expect a stampede of builders conflicting with the patent, if it is granted. I remember the Walker Wingsail too well, it ended badly so I hope these guys are not headed down a similar path. I personally like the KISS approach.
  10. boardhead

    Faster ama shapes

    The leeward catamaran hull kinda needs the same attributes as the amas on a trimaran particularly if there are ama mounted rudders but most smaller trimarans have one, central rudder. So going back to the 8:1 or more length/breadth not making displacement waves (the amas on my tri are 12:1) and the need for more lifting surface than slender amas can provide to plane - would it make sense to hang some planing bottom, 8:1 amas on one of the stern squatting small tris to see if it will flatten out and take off. Winter project for somebody?
  11. Hey Rasp, I don’t remember it that way. Smyth team won the first year, 1985, then Biscuits 2 in ‘86, Biscuits 3 in ‘87 then in ‘88 with Full Pelt, Stephen Fein’s Ed Dubois designed tri pushing the limits with an absurdly tall rig, exotic super light construction and associated higher costs the European series died and the radicalized boats retreated to lake sailing. ProSail was the US version but more one design, cats only, trying and control costs and increase participation but it too was short lived. Adrenaline was certainly radical but I never heard or read anything to suggest she was faster than the community could believe. Jean le Cam pretty much dominated the scene, I still have some VHS tapes of Cantreau in action, she was supposedly clocked at 38 knots with hiking racks, certainly hauling ass on the video. Tom Bandoni brought Cantreau 1 (later Sea Biscuit and Toshiba) and Cantreau 2 (later Running With Scissors) to the States in, if I recall correctly, ‘88 and ‘90 and both boats raced in NEMA with Tom and Debbie Druan driving. Sea Biscuit/Toshiba was the hot boat in NEMA for several seasons, actually pretty decent offshore as she was the first generation and represented the original intent. There were other much more versatile boats like the (modified) Northern Rainbow designed by Adrian Thompson as Promotion/Wild Thing the 40’ prototype version of his 60’ Sebago that finished third in the ‘88 OSTAR. Sadly the Smyth team, optimized to the rule for inshore racing, stole the limelight and changed the focus to more professional inshore circuit racing. Inside accommodation and offshore capability were abandoned in favor of greater flat water speed. With the Atlantic Cup coming to the East coast again next year the multihull community will get to see these “fast” two handed monohulls race from Charlestown to Maine in their well funded prestige series and wonder how we screwed up - maybe Adrenaline could come home and show them the way but, offshore it sure would be taking chances!
  12. Pretty simple really from an articulation standpoint but at what cost in weight, maintenance and dollars not to mention the joys of windage, leaks, ice action, potential for actual bodily harm, and the reduction in platform rigidity - all in the cause of heavier and slower. Do I really see seven bulkheads plus the stern cap in those amas? Dont know how far along the tooling is but as a fellow multihull enthusiast wishing to see a bigger, newer, population of these craft out there I would appeal to you to STOP and consult your Heath Robinson records!
  13. boardhead

    Faster ama shapes

    It may well be but don't venture offshore unless you are talking big boats and crew. I like to sail with my family and friends.
  14. boardhead

    Faster ama shapes

    Don't get me started on submersible amas!