JT HI

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About JT HI

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  1. JT HI

    DC Designs

    The Magic Science of Centre of Effort and Centre of Lateral Resistance. Maybe it is not a magic science but it sure helps to get it correct. With the CE located of course forward of the CLR, some texts suggest a space between the two of 8 to 10 percent of waterline length is the go - The relation ship between CE and CLR is all important - so what thoughts are there concerning this vital relationship. Are there any IC numbers, facts or examples to be shared? JT HI
  2. JT HI

    DC Designs

    Carbon fibre on ply hull bottom - on an IC. Consider a completely flat bottomed IC hull with appropriate rocker and a very sharp entry bow - hull made from ply. Aware that people apply the magic black stuff to stiffen critical areas. Would one apply the C/F on the inside of such a hull - or on the outside? Does it matter? Any thoughts? JT HI
  3. JT HI

    DC Designs

    Hi all, Well , it's almost upon us - Christmas that is - so here's the opportunity to share Seasons Greetings with everybody and wish them the joy of Christmas in what ever way they celebrate it. My thanks to those of you have have responded to my requests for information regarding an IC build -your comments are appreciated and my knowledge bank is expanding - the build is not too far away. Happy sailing - whether it be in the snow or the sun! Cheers JT HI
  4. JT HI

    DC Designs

    Shroud location - DC canoe. What sort of measurement seems to be 'the go' for the location of shroud anchorage points aft of the mast. I'm sure it varies and realise that people have shrouds that are adjustable but as a 'peg in the ground' figure what sort of distances are out there. Be interesting to compare main/foresail rigs against main only. JT HI
  5. JT HI

    DC Designs

    Thanks SHC for the explanation re 'Line of greatest beam'. Funny how one can get hooked into a fixed vision and not see something else. Mast info from you and others appreciated. An older and wiser JT HI
  6. JT HI

    DC Designs

    Thanks ICAUS The differing rules both came from the same source www.intcanoe.org/library. Google in as I have titled 'A' that includes the (2008) and it will bring up the references to convex, concave and straight. Google in as I have titled 'B' which does not include (2008) and there is no reference to convex,concave and straight. I checked with the UK IC site as you suggested and it is 'A' that appears. Thanks for pointing me in the right direction. Certainley the less than correct material needs to be removed as it is misleading. Turning attention now to an imaginary hull, the rules would require that a transition from a side gunwhale edge to a 45 degree (or thereabouts) transom, at deck plan level would require a radius of at least 60mm. What's the situation below at the chine. Does that require a simular radius? ......or may it be a hard angular junction .........suggesting that the tranistion point, from gunwhale or sheer to chine, is a section of an inverted cone? Thanks. JT HI
  7. JT HI

    DC Designs

    Mast simplicity/ also rule confusion. Thanks to the respondants regarding 'mast simplicity' Your input has been of value. Confusion. I note that - A. Appendix IV Development and Measurement Rules of the International Ten Square Metre Sailing Canoe (January 2008) Section 5 Hull ( Lines of greatest beam.......indicates references to convex and concave curves, also straight lines. B. Appendix IV Development and Measurement Rules of the Internatonal Ten Square Metre Sailing Canoe. (No reference date is indicated in the text) Section 5 Hull ( Lines of greatest beam.......makes no reference to concave, convex or straight lines. Which set of rules may be regarded as the correct and current version ...... A or B? Wading through all this stuff must be harder than the building and sailing part! Thanks all, JT. HI.
  8. JT HI

    DC Designs

    Mast simplicity. No doubt it has been done before but I'm thinking....... a deck stepped rotating mast, sail within a track, with a boom at the base located between two mast mounted sideplates, a bolt through holding the boom. Compression strut 'vang' The mast stayed with side and forestays attaching at the front face of the mast to allow rotation. Obviously spreaders would be out as rotation of mast would affect spreader length so mast control could be by diamonds. What pros and cons are out there?
  9. JT HI

    DC Designs

    Thanks MCR. I have watched with interest your posts and the "god's eye view" shows your parallel gunwhale/track situation well. I note your comment regarding the next hull and not extending your hull width so far aft. Tell me more about your North sail. Yes it is a una rig and thus would be the full10 sq. metres. Do you feel that the main only enables the boat to go about as well as a jib and main? How do you deal with the lowering requirement when on water? Which North outlet did you go to? Thanks JT HI Thanks JT HI
  10. JT HI

    DC Designs

    May seem an ignorant question, but with a focus on the measurements that apply at the BMS station - between 1300mm and 2600mm forward of the stern - the widest beam of the hull and the relationship of thevertical measurements of 100mm and 275mm/750mm min width - what or where is the BMS location considered to be when from a shroud/sidestay attachment point aft the beam could be constant to accomodate a carriage track. Would the 750mm min. width apply back aftwards to the 1300mm mark?