{"id":7712,"date":"2023-12-20T14:48:25","date_gmt":"2023-12-20T13:48:25","guid":{"rendered":"https:\/\/newone.onesails.com\/?page_id=7712"},"modified":"2024-05-10T10:18:22","modified_gmt":"2024-05-10T08:18:22","slug":"spinnaker-trimming","status":"publish","type":"page","link":"https:\/\/www.onesails.com\/no\/spinnaker-trimming\/","title":{"rendered":"Spinnaker Trimming"},"content":{"rendered":"\t\t
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Spinnaker Trimming<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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by Paul Eldrid, OneSails Australia<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There are two primary parts to downwind sailing with spinnakers:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t1. SAIL<\/strong>\n
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  • What the sail is?<\/li>\n \t
  • What we want to achieve with this sail?<\/li>\n \t
  • Where the chosen sail fits in the boat\u2019s inventory<\/li>\n \t
  • Is it suited to the boat?<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    \n\t\t\t\t\t\t\t\t\t2. TRIM <\/strong>\n
      \n \t
    • How do we set, trim, adjust and configure the sails to extract maximum performance.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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      \"\"<\/figure>

      In the old days downwind sails were typically defined by weight...i.e. 0.5, 0.75, 1.5 etc. In the computer age (80\u2019s onwards) Science overtook art and \u2018Codes\u2019 were given to sails based on their mold or \u2018flying shapes\u2019 which were optimized for different TWA and TWS.\n\nThis is still evolving as we entered the supercomputer age of CFD and FSI analysis.\n\n<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\tStart with the main<\/strong>\n
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      • Set the halyard for downwind<\/li>\n \t
      • Use the vang to control twist<\/li>\n \t
      • Sheet tension for:\n
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        • Optimum boom angle \/projected area<\/li>\n \t
        • Battens and spreaders<\/li>\n<\/ul>\n<\/li>\n \t
        • Easing outhaul is questionable downwind! Most important is that it is not forgotten when going upwind<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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          \n\t\t\t\t\t\t\t\t\tChoosing which sail:<\/strong>\n
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          • Choose your sail for your angle and wind strength<\/li>\n \t
          • Choose the sail that suits your boats VPP \/ Polar<\/li>\n \t
          • Make sure the team know how to set it up!<\/li>\n \t
          • Make sure your defaults are pre\u2010set<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            Symmetrical Sail Trim<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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            • Start with TWA \u2013 what is the TWA for the course you are sailing?<\/li>
            • The luff \u2010 pole height, pole angle, tack height will influence your trim.<\/li>
            • For S sails set your pole angle for optimum projection \u2013 as close to 90o to the wind as possible.<\/li>
            • Next comes the sheet \u2013 ease it or \u2018float\u2019 it until it rolls.<\/li>
            • Observe where the luff \u2018caves\u2019 or curls first.<\/li>
            • Adjust tweaker to control the rolling.<\/li>
            • For S sails re\u2010trim pole angle for optimum projection.<\/li><\/ul><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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              Pole height…<\/strong><\/p>

              • Alters luff length, therefore projection \u2013 higher pole = the further the sail will fly away from the boat.<\/li>
              • Alters where the sail will roll \u2013 generally the higher the pole the higher the luff will \u2018cave\u2019 or curl.<\/li>
              • Alters boat handling \u2013 the further away from the boat the sail becomes it effects directional stability.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                \"\"<\/figure>

                TWA and the Pole<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                Pole angle, height & projection<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                Tweaker \/ Downhaul<\/strong><\/p>

                • Tweaker alters the sheeting angle<\/li>
                • Tweaker alters the twist of the sail<\/li>
                • Tweaker controls the power in the sail<\/li>
                • Lock it down for depth<\/li>
                • For depth \u2013 keep the sail symmetrical<\/li>
                • For speed \u2013 twist the sail to make it asymmetric!<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  \"\"<\/figure>

                  Tweaker down<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  Tweaker up<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  \"\"<\/figure>

                  Roll the boat to windward for increased projection and optimise your downwind TWA. This is a common technique employed by race crews often referred to as \u2018pressing\u2019 or sailing on the \u2018red line\u2019.\n\nBy adjusting the boat\u2019s trim with crew weight on the weather side and grouped in the side stay area the windward heel can produce an effect which makes the helm neutral, projects the spinnaker and results in the boat sailing deeper at the same speed.\n\nResults vary with different boats \u2013 but is worth experimenting as the results can be dramatic!<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  Asymmetrical Sail Trim<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  \"\"<\/figure>

                  Angles are everything! Be sure you know the TWA for your course so you can select the most suitable sail!<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  Trimming the Asymmetric<\/strong><\/p>

                  As luff length has a direct effect on how deep you can sail, you can alter this with your Luff tension (halyard, tack line) and your tweaker tension based on how much sheet you have eased out.<\/p>

                  As you ease the sheet the leech will \u2018fly\u2019 more, so you may need to pull the tweaker on as the sheet gets eased to control the leech. This will result in you being able to sail deeper. If you ease the tack up, or the halyard down a little, this will allow the luff to project even more, adding to an increased TWA.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  \"\"<\/figure>

                  As the sail eases the leech twists<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  \"\"<\/figure>

                  Tweaker down for deeper running as the sheet gets eased.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  \"\"<\/figure>

                  Ease the tack to induce luff projection = deeper angles.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  \"\"<\/figure>

                  Communication<\/strong>\n
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                  \n\nAs with trimming upwind the same \u2018trim cycle\u2019 must be applied to downwind.\n\nThe discussion is related to the balance of the boat, the desired angle to sail the boat...and this being synchronised between the helm, trimmers and crew.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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                  Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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                  1. Know the course you want to sail<\/li>
                  2. Know the TWA for this course<\/li>
                  3. Choose the spinnaker\/setup<\/li>
                  4. Adapt \/ change gears using controls<\/li>
                  5. Adjust controls to manage power<\/li>
                  6. Every boat is different…experiment!<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                    Spinnaker Trimming by Paul Eldrid, OneSails Australia Introduction There are two primary parts to downwind sailing with spinnakers: 1. SAIL What the sail is? What we want to achieve with this sail? Where the chosen sail fits in the boat\u2019s inventory Is it suited to the boat? 2. TRIM How do we set, trim, adjust […]<\/p>\n","protected":false},"author":4,"featured_media":7819,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-7712","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/pages\/7712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/comments?post=7712"}],"version-history":[{"count":34,"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/pages\/7712\/revisions"}],"predecessor-version":[{"id":26908,"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/pages\/7712\/revisions\/26908"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/media\/7819"}],"wp:attachment":[{"href":"https:\/\/www.onesails.com\/no\/wp-json\/wp\/v2\/media?parent=7712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}