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FAQ Category: Hull and Underbody Questions

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: Centerboard profiles are now shown in the underbody sketches for Keel Types 4, 5 and 6 here.
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Q. Where/How do I find the weight of my keel so I can complete the ballast weight portion of the certificate?
A.  Designer data, builder specifications and brochures, etc. are typically the best source.  If necessary, the CRF Technical Committee can help with researching ballast data or even calculating it from […]
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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 […]
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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 […]
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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 […]
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Q. The only information that I have on displacement for my yacht comes from original design specification. How can I update that to a current ‘as raced’ weight?
A. Designers and builders typically provide displacement data referenced to the ‘design waterline’ that most often resembles a ‘light ship’ condition, with empty tanks and minimal food and gear. The weight […]
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