gaff cutter

Discussion in 'Boat Design' started by peter radclyffe, Nov 4, 2010.

  1. peter radclyffe
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    peter radclyffe Senior Member

    thanks Richard its a thought,

    L L i have heard of Alan Payne, tho i know little about him
     
  2. peter radclyffe
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    peter radclyffe Senior Member

    Teddy, i dont know, i design by carving half models to scale, in 1985 as part of my thousand hull study,in a few weeks i carved /designed 60 boats to scale, smacks, cutters, ketches, yachts, trawlers, tugs, cobles, barges,schooners ,coasters etc i was trying to teach myself design, some days i would carve 2 models, then i didnt carve for a while, but i cant tell you where the c o g, is, or the stability calculations, this forum & the w b f, have given me more confidence to present my designs & start designing again
     
  3. naval ark
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    naval ark Member

    The nice little profile sketch you posted is fine as a starting point, or concept, of what you'd like to end up with. It is quite a long way from an actual design.

    To 'responsibly market' any vessel these days requires professional calculations demonstrating the validity of the design as something more robust than a pretty sketch.

    The regulatory bodies would probably like to know the vessel won't simply break apart at sea (hence structural calcs req'd), or won't simply roll over if the wind/sea gets up (hence stability calcs req'd).

    You would probably like to know the vessel moves through the water at a certain speed, hence resistance/powering/rig sizing calcs req'd. I'm assuming the onboard systems - tankage (fuel and fw), black/grey water, electricity, etc. - will be simplified to the point of not requiring any special expertise beyond basic plumbing and 12VDC experience (not necessarily a safe assumption).

    Nowhere is there a requirement that says a computer must be used for any calculation or drawing. I'd suggest trying to run through all your deliverables by hand - just once - in order to appreciate the machine as simply a tool, no different to your hammer and chisel.
     
  4. Landlubber
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    Landlubber Senior Member

    peter,

    You do know of course that your half models can be cut up (carefully) to provide the sectional lines drawings to start off the show. I was involved in a 65 foot BOC racer that we did just that with, made a foan model, cut her up on the bandsaw and drew the sectional plans from them, it was actually lofted from those sections.
     
  5. TeddyDiver
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    TeddyDiver Gollywobbler

    Not necessarily.. classic lines, although originating from so late like 30' or something, can make the vessel considered as a "traditional" one. In that case CE requlations don't apply, and it can be consructed with traditional methods and scantlings. I don't mean that they (calcs) would do any harm but anyways..
     
  6. peter radclyffe
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    peter radclyffe Senior Member

    lets get all the patronising comments out of the way as soon as possible
    [​IMG]

    here is a 26 ft m f v hull i designed & built in 1989, which was featured in Designs for wooden boatbuilding, Oughtred 1990
     
  7. peter radclyffe
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    peter radclyffe Senior Member

    yeah , or you can loft out a lift model, which i've been doing for 25 years
     
  8. peter radclyffe
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    peter radclyffe Senior Member

    [​IMG]
    here is a 6 metre boat i designed & built, graphics by graham westbrook
     
  9. peter radclyffe
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    peter radclyffe Senior Member

    [​IMG]
     
  10. peter radclyffe
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    peter radclyffe Senior Member

    [​IMG]
     
  11. peter radclyffe
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    peter radclyffe Senior Member

    [​IMG]

    here is the body plan for my 9 metre baltic cutter, which i have just lofted & patterned
     
  12. peter radclyffe
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    peter radclyffe Senior Member

    1990

    [​IMG]
     
  13. peter radclyffe
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    peter radclyffe Senior Member

    [​IMG]

    in charge of 100 people for 4 years on construction of lulworth, i started on my own & corrected her shape, no one had worked on the derelict hull for 11 years, then i patterned the whole boat,some 4,000 measurements later,i then lofted her out full size ,then made all the offset, bevel & accompanying tables, this plan shows only half the waterlines, for a wooden hull every 50 cm would be enough, but as it's composite i chose to double the waterline offsets to every 25 centimetres, for precise accuracy for making & bevelling frames, then my patterns were used to completely reframe & build her new, in a process of reverse lofting i made a half model, my lines plan was used for all the models, rigging, G/A, engine, all new construction & the new 70 ton lead keel,

    Dykestra had made a lines plan years earlier but it was not accurate, fairlies did not know how to measure her, so i did it
     
  14. TeddyDiver
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    TeddyDiver Gollywobbler

    Just amazing lines :cool: Thanks Peter!
     

  15. Landlubber
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    Landlubber Senior Member

    wow peter, that is one hell of a drawing....seriously good work.
     
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