GP Sails have been very helpful and are very knowledgable sailors offering good advice and in discussions think that I'm heading along the right route to getting the best out of the sail.

However being from an engineering background it would be a bonus to find any articles with pictures of well set spinnakers or discussions on the merits of for example tight and slack luffs which there seems to be differing opinions on. On the GP spinnaker just tightening the luff 50mm made a big difference on the range of wind angles it liked. Do we tighten it further and what would the repercussions be ?.

Having only sailed with this sail a few times, there is a real learning curve and I guess experimentation is the key. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />