Guys this will be my last day on this thread, at least regarding the way I have been running it. I have to prepare my sailing summer and have other stuff to do. This takes simply too much time.
I will try to reply to all that pose concrete questions but I cannot say how long it will take to reply.
This is not my thread anymore, but your thread. Along the time there were many knowledgeable sailors that have participated. It is all yours I hope you can maintain it with the same interest that justified more than a thousand hits a day.
Best regards to all.