Bill Gibbs

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About Bill Gibbs

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  1. Bill Gibbs

    PHRF, ULDB classes?

    When PHRF makes changes, NOSA will follow PHRF's rules and ratings, as they are the rating organization and define the "PHRF Class". As we would for any Class we offer starts to. The only changes I've heard of relate to changing the Corinthian ratings significantly, even to losing the name.
  2. Bill Gibbs

    PHRF, ULDB classes?

    I appreciate your honesty. It doesn't mean I agree with you however.
  3. Bill Gibbs

    PHRF, ULDB classes?

    Regarding the PHRF Performance Factor (PF), the formula is simple [(.67*LWL)+(.34*LOA)] * (SA/DISP)] I am no hydrodynamicist, but this makes a certain sense. The SA/DISP is going to ramp up the PF for highly powered light boats. Boats that are likely to plane. The LWL & LOA factors recognizes that boats don't sail at their static LWL. All single value handicap systems (and I include PHRF because we only use one of their 3 ratings in a race) strive to be perfect for one wind speed, one sea state, and one point of sail (or one combination of these). Different boats perform differently as a race deviates from these target conditions, reducing accuracy of CT results. Our 120nm coastal races deviates a lot. One solution is to group similarly performing boats. In PHRF the rating itself is one indication of "similarly performing", but misses the ULDB effect of going faster in more wind (planing being one reason). The Performance Factor is another performance grouping factor that considers this. We are using both in 2019.
  4. Bill Gibbs

    PHRF, ULDB classes?

    N2E would like to attract as many participants as possible, for a fun race to Ensenada. NOSA is not a rating organization. We chose a ULDB split based on Performance Factor (PF), because PF is defined by the PHRF SoCal rules. We choose PHRF SoCal for monohull ratings, because this is the largest racing fleet in southern California. If a group of boats approached us and asked for a one Design or alternate rating class, we would oblige them. If we could get more boats racing under an alternate rating system, we would consider it. As a race organizer we provide a service to our customers, the participants. We try to understand their desires. This does not make everyone happy. Oh well. I enjoy seeking SA comments. I don't think SA is necessarily the mainstream opinion of most racers, but they do represent many of the different perspectives out there.
  5. Bill Gibbs

    PHRF, ULDB classes?

    Oh, I definitely think I'm getting opinions.
  6. Bill Gibbs

    PHRF, ULDB classes?

    The input here was generally favorable to the idea of separating ULDB/planing boats from the other monos (as I understood the comments), so we did it. 2019 N2E will have separate PHRF classes for ULDB & non-ULDB boats. How bad can it be? (NORs posted and Entries open a couple weeks now)
  7. Bill Gibbs

    PHRF, ULDB classes?

    Oh.
  8. Bill Gibbs

    Lashings...

    Since Spectra creeps at a sustained load over about 20% of breaking strength, rigging is upsized to avoid this. Spectra stretches more than steel, and rigging is upsized to bring stay stretch into a desired range. Lashings, in my experience, also stay under 20% of breaking strength for the same reason. Every loop you add, reduces lashing line load. The original picture takes this idea and has at least 3 more loops than the Colligo hardware intended. I didn't have the Colligo instructions when I lashed my first deadeyes 12 years ago. I used an eye splice to start, and finished with a pressure loop on the upper deadeye big opening followed by at least 3 same direction half hitches on the last line. After that knots were just to use up tail. 12 years, thousands of miles, 2 boats, all rigs standing, never a slip, untie without tools.
  9. Bill Gibbs

    PHRF, ULDB classes?

    I went off and skimmed thru the ORR EZ rules and overview. There is no mention of boats needing wind instruments. It doesn't sound all that different from other systems. They calc a rating from their VPP, have a committee to adjust from observed performance, rate for a variety of conditions, and give the Organizing Authority some ability to guess the wind condition mix for a specific race. Heck, PHRF rates for a variety of race conditions. Maybe ORR EZ is better. My first problem arises when conditions in a coastal race don't match expectations, or simply vary all over the place. A common N2E race starts upwind in light wind, shifts into a windy downwind race, than variable light wind all night. Which one category best describes it? Portsmouth has the ability to pick a single wind range, but as far as I know it is rarely used. If a rating system uses observed performance at all, it is hard and subjective to separate out which part of that performance is crew performance or boat condition. I have heard discussions of rating systems using measured wind conditions on individual boats (is there one being used?). But if a rating system uses actual boat experienced wind conditions, you are factoring out the sailing skill it took to get into better wind, and the boats need calibrated wind instruments as you mentioned. These are not simple problems to solve.
  10. Bill Gibbs

    PHRF, ULDB classes?

    I think we have to wait till after the next America’s Cup.
  11. Bill Gibbs

    PHRF, ULDB classes?

    Your 80's era ULDB (and boats like it) is probably why SBKH uses 2.7 as the line for being a "ULDB" rather than the old PHRF line at 2.1 It's nice that PF may get a new formula. But the problem is that better math can't solve this problem with one value supposed to be perfect for all courses and wind conditions.
  12. Bill Gibbs

    PHRF, ULDB classes?

    Another alternative is to use PHRF TOT for ULDB boats. TOD assumes hull speed. TOT assumes boats sail proportionately faster in more wind, which is kinda of what you are describing.
  13. Bill Gibbs

    PHRF, ULDB classes?

    A recent change in PHRF is to offer boats rating adjustments for specific cruise gear on board. The rating with these adjustments is a Corinthian rating, intended to race against normally rated boats in race trim. See Appendix F in the PHRF Rule link above.
  14. Bill Gibbs

    PHRF, ULDB classes?

    PHRF rules
  15. Bill Gibbs

    PHRF, ULDB classes?

    Performance factor is defined in SoCal PHRF rules, even gives the formula.