Thanks Rolf.
However it would be interesting to have other Tornado's and some F18's data (for sure the F18 class is the other most developed catamaran class with regard to spi design).
Therefore I invite all of you to post the requested measures (luff of their spis, max halyard to end of pole distance, mid girth to foot).
Two of them can be found easily in yr measurement certificate.
The data provided by Jake, Dlennard and pitchpoledave are interesting only for a certain kind of guys.