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44 Technical page ISMA News International 6mJI Association Hello Guy-Roland I am now wroking with many Finnish Classic six metres and one of them is Silène III FIN-61 ex Z-41. You measured this boat 1983. But the measurement is in fresh water with rating 6.030. Can you explain the measurements. For example: -the difference of immersion in salt and fresh water is 9mm -freeboard, I add 9mm to get the freeboard in salt water -the length L1-L1 (7.521m) measurement is 90mm up from saltwater -the maximum sail area is the same in salt water measurement -what is hand written in the end of page ‘Conditions diverses’ -why this system was used in Switzerland? -finally can you find any other earlier certificate of measurement? For example measurement which was made by Henri Copponex 5.5.1955. I will measure Silène to the present rule with the original measurement marks and with the special classic immersion triangle 50 mm above. That’s why I have to know the original measurements. If I don’t find any other I will use the 1983 measurement as an original. In the attachment you find the 1983 certificate in the present measurement template. For the events 2011 Six metre World Cup and 5.5 Metre World Championship we are eady to take care of the measurements and boat check with Mr Jaakko Olkkonen (Finnish SF chief keel boat measurer). Do you have any plans for the coming years? with best regards Matti [mailto:masa@kotikone.fi] Hello Matti, A 6m measured in fresh water will float deeper and therefore have a longer LWL and L. It is not sufficient to add 9mm to mid girth and freeboard, and substract 9mm on draught. This method was recognized by IYRU for fresh water measure. If you want to go to 6m you need to float your boat, measure water density and freeboard, and adjust the your positioning of the LWL accordingly. If water density is 1.000 kg/dm3 the LWL will be 9mm lower, if density is 1.0125 kg/dm3 LWL will be 4.5mm lower. From that new measure you can reposition L1. Your L will be smaller, the girths differences will be bigger, freeboard will be bigger, d will be bigger, draught wil be smaller and you will get a rating of 6m instead of 6.03. It is important to check water density in the Baltic , it is normally less than 1.025 and there is a big variation with seasons due to ice melting (fresh water!). I will check in my archive what I have for Silène, but for sure all certificates have been issued in fresh water at 6.03. For 2011 world championship I will see with the ISMA what they plan. Best regards ©Gilles Favez ISMA 7 Guy-Roland guyroland.perrin@gmail.com
ISMA News International 6mJI Association Bulletin 1/2010 Information of general interest When we looked through the old ISMA archives we found a proposition of Marc Berthier for an ISMA logo. It’s nice but may be some too complex as to used throughout all publications and events. But it should be seen another time: 45
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ISMA NEWS - Association Suisse 6mJI

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