A. Yes, as long as you declare a spinnaker pole length ‘SPL’. Note that a whisker pole can only be used to wing out a headsail, and not to trim a […]
Archives: FAQs
Q. Can I include both symmetrical and asymmetrical spinnakers in my inventory?
A. Yes, as long as you declare a spinnaker pole length ‘SPL’. If you declare both a pole length ‘SPL’ and a spinnaker tack point ‘TPS’, CRF will calculate a spinnaker […]
Q. Please explain the difference between a spinnaker pole and a whisker pole.
A. Any pole used in trimming a spinnaker is a spinnaker pole, and it is rated as such with its overall length declared as ‘SPL’. A whisker pole is a pole […]
Q. Please explain the definition and use of the declaration for the tack point of an asymmetrical spinnaker (TPS).
A. ‘TPS’ is the distance from the forward face of the mast to the attachment point for an a-sail tack to the deck, to an anchor roller, to a bowsprit, or […]
Q. In light air, I plan to fly a headsail whose mid girth is less than 50% of its foot length, but it is too big to fit inside the nominal foretriangle. What should my declarations be for foretriangle height (IG), foretriangle base (J), and longest perpendicular, LP?
A. This sail is by definition a headsail and not a spinnaker (See RRS 55.4), and CRF will rate it as a headsail. For such a sail, ‘IG’ would be […]
Q. Some previously ‘square head’ mainsails in the Spirit of Tradition (SOT) class were converted to gaff headed sails and were rated as such in 2016. How will such conversions be dealt with under CRF?
A. Under CRF, gaff headed mainsails in the SOT class will be rated as ‘square headed’. Exceptions to this approach are possible in cases where the sail configuration is very intentionally […]
Q. Can you clarify the difference between the declared heights of jib headed and gaff headed mainsails?
A. The height of a jib headed mainsail is declared as ‘P’, which is essentially the luff length of the sail. The height of a gaff headed mainsail is declared […]
Q. I have a yacht with a centerboard, and none of the keel profile sketches displayed in the rating application show a centerboard. What keel type should I declare?
A. Check the box corresponding to the underbody profile that most closely resembles the fixed portion of your keel and your rudder type. CRF accounts for the effect of the […]
Q. Why is the “Underbody Type’ declaration included in the CRF rating?
A. Stability and wetted area are critically important performance parameters, but it is not reasonable or practical to ask yacht owners to declare appropriate values for them. The 6 underbody types […]
Q. I have determined that the displacement of my yacht is heavier than that shown in the designer/builder specifications. How does this affect the other CRF data declarations that I need to make?
A. If you are declaring a displacement that is heavier than the designer/builder specification, it follows that your declaration for the LWL that corresponds to that heavier displacement should be […]