[quote=revintage]Hi Andinista,
Nice to hear from you again. All you say is correct, I also made calculations, but looked at tension in line with the bridle wire BT, where forestay tension is FT.
This is the ballpark figures I get with 2500mm hull distance at the chainplates:
a=41 BT=FT*.75 for each wire H=1071mm, equivalent to 5.5 foil
a=34 BT=FT*.9 for each wire, H=838mm, Tornado
a=30 BT=FT*1 for each wire, H=722mm
If we look at the Tornado rules, triangle height in line with the forestay is min. 838mm and I guess width between hulls is about the same as my widened 5.5, 2500mm.
Think I´ll go for the 838mm triangle height of Tornado. This will give a BT increase of ca 1.2x. Sailing only inlake with flat water and never over 18-20knots, makes me think this will work.
Still the question is how strong the hulls are in the bows and how well the chainplates are anchored inside the hulls? I rely on the Nacra boys built them with some kind of safety factor.
Static tension is easy to measure, wonder how much forestay tension is with full sheeting upwind?
Could you please double check my calculated 1.2x load increase when going down to Tornado bridle height?<!-- editby --><em>Edited by revintage on May 23, 2018 - 09:45 AM.</em><!-- end editby --> [/quote]
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