We all know that changing conditions impact differently on spi boats than they do on non-spi boats.

We will never be able to fully compensate for that unless we are willing to use a lot more complicated systems.

However we can much reduce the offset that we percieve in the current systems.

Example :

Spi boats tend to witness their largest gains, relative to non spi boats, in 5-12 knots conditions. This would largely coincide with the non-trapezing group of conditions. Above 12 knots of wind the difference decrease, minimizing at the far end of the scales (25 knots). This is arguable a constantly changing curve spanning the range from 3-25 knots. Approximating this actual behaviour by two horinzontal lines (averages in their own segments) is always better than to approximate it with just one horizontal line over the full spectrum.

By decoupling the spinnaker hit in the trapeze and non-trapeze segments of the windspeed we arguably cut the current ofsets in halve.

It will still be not perfect but yet alot better than we have no. Hopefully, probably, enough to get good ratings for club races were there aren't enough boats to group spi boats with spi baots and non-spi boats with non-spi boats.

In the working example I will provide later I have chosen, on data available to me, to hit spi boats harder in the sub trapeze conditions than they are in the trapeze conditions.

Wouter