so basically as the main force attach point at the mast top is fixed and not rotating there is still a tendency that every spinnaker tries to de-rotate the mast.
Actually there is one methode that doesn't have this tendency at all. Go to
http://www.geocities.com/f16hpclass/Tech_genaker_mast_setups.htmlAnd look at drawing 4 with the bottom 2 photographs.
I've tried this system myself but I'm now using the setup shown in drawing number 1 where The top line has a loop that is just thrown over the top of the mast and hanging of the mainsail hook fitting. This seems to work out well when the spi gate is at 7.5 mtr and thus a mtr below the mainsail hook fitting. I don't notice too much derotation under spinnaker and all derotation that I get I seem to want anyway. The effect in this setup is pretty small if it is noticeable at all, in my opinion.
but as long as my mast can deal with those forces those following the F16 specifications should feel really safe with their super wing section!
WOW ! a F18 21 sq. mtr. spi on a spi gate that is 0.5 mtr higher on the mast then the F16 gates ! This is great info Dirk. You are easily putting the mast under twice the bending load that a normal singlehanded F16 sailor would. If the mast is holding up well under that then the solo F16 sailors have a considerable margin with respect to keeping the mast tops on board. I would expect this to easily translate into possible a significant derotation of the mast while singlehanding. Note how this excludes doublehanding, everybody, here the sail forces are alot higher due to much greater righting moment of the crew.
Thanks Dirk I think I will try to derotate my mast further when singlehanding under spi; just like Eric and Paul. I feel this should make the singlehander setup noticeably faster. Flat is fast !
Wouter
