All,

I plugged the numbers into the SCHRS calc here

And rating the Tornado as a new boat (as it would be with a changed hull) so using just LOA, the rating with the current plates would be 0.927 (but as the tornado was measured before the rules changed it is rated with LWL and LOA and so comes out at 0.935 for the current boat).

So old plates, new measurement = 0.927

New hi-aspect plates = 0.913 so SCHRS suggests that daggers would gain you a little over 1%.

One reason NOT to put daggers in a standard Tornado hull would be that it would be measuered as a new hull (as it has been changed), better to build a new hull shape based on more modern thinking.


However, I totally agree with Rolf, that if I was building a new 20 foot boat, I would put a Tornado rig on it.