vovaleague.blogg.se - Code zero spinnaker

#Code zero spinnaker full
#Code zero spinnaker code

#Code zero spinnaker code

Many boats have a 75% mid-girth Code Zero in their sail inventory and they have proven very effective performance-wise.

There are a few points to consider as we move forward. So, what does this mean for the future of the “Code Zero”? Sail selection chart comparing typical Code Zero, A1 and A1.5 use against the region (green) that the ORC VPP has considered the 75% mid-girth. Of course, to not have the Code Zero onboard for a coastal or long-distance race has the potential to diminish performance and the question is whether the existing 75% mid-girth Code Zero is the best approach under the new VPP. Under the new VPP the “penalty” for carrying the Code Zero would be an additional 40 minutes or about an 0.847% increase on corrected time. The changes are not inconsequential! In the recently completed Rolex Sydney-Hobart Race a very well placed TP52 had an elapsed time of approximately 57 hours.

#Code zero spinnaker full

The release of the updated Velocity Prediction Program (VPP) by the ORC in January has allowed test certificates to be run and the full extent of the rating changes to be assessed.

This is an effort to more accurately reflect their performance and as a consequence could result in a potential increase in rating for boats carrying such sails, which might lead to a different approach going forward. What this essentially means, is that the new rule does not make the 75% mid-girth Code Zero illegal under the ORC rules but what has changed is the aerodynamic evaluation of such sails. Amongst the summary of changes for 2020 that emerged from the Annual General Meeting of the Offshore Racing Congress (ORC) held in October last year was that “For asymmetric spinnakers with SHW/SFL in range of 0.75 – 0.85 aerodynamic forces are calculated with both coefficients for the spinnaker and for the headsail set flying with one giving faster boat speed taken as final.”

However, this is set to change due to new rating rules from the Offshore Racing Congress (ORC). Designed to fit within measurements for boats with non-overlapping genoas, the Code Zero measured in as a relatively narrow, flat spinnaker that could essentially be almost three times the size of a non-overlapping jib, whilst attempting to maintain a similar shape to a reaching genoa. For years, the Code Zero, a flatter, more triangular-shaped sail for close reaching, has somewhat circumvented rating rules.