1 / 20

US Sailing Universal Measurement System (UMS) Measurer Seminar

US Sailing Universal Measurement System (UMS) Measurer Seminar. High Performance Rule (HPR) Overview Jim Teeters. Why HPR?. Rule is customized for high performance boats Type-form to fast design – low performance boats not competitive Ability to plane offwind in medium breeze

regina-clements
Download Presentation

US Sailing Universal Measurement System (UMS) Measurer Seminar

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. US SailingUniversal Measurement System (UMS)Measurer Seminar High Performance Rule (HPR) Overview Jim Teeters

  2. Why HPR? • Rule is customized for high performance boats • Type-form to fast design – low performance boats not competitive • Ability to plane offwind in medium breeze • Public (open spreadsheet rule calculator) • Simple (measure ONLY the fundamental characteristics that determine speed) • Leave details to designers to simply create fast boats. • No subjective elements

  3. Carkeek 40s Decision, Spookie, Denali^2

  4. McConaghy 38

  5. Mills Concept

  6. HPR Design Features • Characteristics of contemporary grand prix • Light displacement, wide beam, high sail area promote offwind planing • Deep draft, modern fin/bulb keels, low VCG for upwind speed • Long waterlines relative to LOA • High sail area, long sprits, flat had mains.... • No moveable ballast

  7. What is Rated? • Rated Length = LOA (overhang credits for old boats) • Max Beam, Draft, Displacement • Upwind Sail Area, Spinnaker Area, Rig Height • Freeboard – mild encouragement of interior volume • VCG – surrogate for stability • Crew Weight • Propellers • Construction Credit, Old Age Credit

  8. What is Not Rated? • Details of hull shape: (no offsets files required) • No wetted areas, LCBs, prismatic coefficients • No details of appendage design: wetted area, volume • No heeled stability (VCG and beam act as surrogates) • Intent: Adopt some of the rationale behind box rules: minimize design optimization of trading off design details, leave freedom to designer to find fastest solutions, encourage development

  9. Rating Summary

  10. Type-forming • Default boat – based on rated length: • Beam, draft, displacement, freeboard.... • Upwind sail area, spinnaker area, rig height... • VCG, crew weight • Rating based on deviation from default boat • Limited credits for being slower • Limited penalties for being faster • Credits/penalties initially calibrated with VPP

  11. Type-forming

  12. VCG Determination • Method 1 – Component Weighing • Mast weight and VCG • Boom weight • Total weight from scale • Keel weight and VCG • Canoe + rudder weight imputed, VCG coefficient • Method 2 – Offsets File + In-Water Flotation • VPP hydrostatics, salinity correction • Sensitive to environment: wind/waves...

  13. Keel Weight/VCG • Requirements • Two lift points: bulb and keel top • Keel top can be anywhere, typically at keel bolts • Lift points and support points must be vertically aligned • Axis of lifting lines must be vertical • Keel blade must be horizontal when lifted • All distances are relative to bottom of keel

  14. www.hprsailing.org

More Related