Nytt ORC VPP för 2013

Alla mätregler uppdateras ju kontinuerligt. En VPP-baserad regel som ORC International, där man har en matematisk modell som räknar ut teoretiska farter, så handlar det oftast om att man uppdaterar de moduler som räknar ut framåtrivande krafter och motstånd. Eller viktningen av olika faktorer.

De senaste åren har ORC varit avvisande till motioner som har rört “skevhet” i systemet. Till exempel så har de flesta seglare ansett att TP52 varit gynnad, men ORC har envist hävdat att så inte är fallet.

Nu har man i alla fall gjort en rejäl uppdatering, och TP52 Blixt Pro Sailing som vann SM i år har plötsligt blivit nästan 4% snabbare. Även italienska NM38S som vann VM skall måste segla nästan 3% snabbare nästa år.

Och den relativa skillnaden mellan TP52 Wolfpack (tidigare gynnad) och King 40 Magic (tidigare missgynnad) blir hela 5.7%!!! Det borde göra stor skillnad på kappseglingsbanan!?

Det är mycket stora differenser i en etablerad och vetenskaplig VPP-modell. Sedan skall det ställas i relation till de förändringar som ställde till sådan förfäran i SRS :-)

Här är ett urval av den svenska fleeten:

Båt – Båttyp – GPH2013 – GPH2012 – Delta GPH%
Blixt Pro Sailing TP52 ‐ ONE OFF 457.4 475.1 ‐3.88%
TRIXIE X332 647.0 657.1 ‐1.56
XPLORER X‐332 646.2 656.1 ‐1.53
BOXER X‐332 SPORT 632.6 641.7 ‐1.43
PERFECT EXCUSE TOO X‐362 SPORT 618.5 626.9 ‐1.36
FOXY LADY IMX 40 588.5 596.1 ‐1.29
AIDA FIRST 40.7 597.0 603.0 ‐1.01
Feelgood Salona 37 610.4 615.6 ‐0.86
Zakela SINERGIA 40 579.8 584.6 ‐0.82
Calliope Arcona 340 620.4 625.4 ‐0.81
HARRIET II XP 38 581.0 585.3 ‐0.74
4tyone DEHLER 41 DB 571.0 574.8 ‐0.67
Dehlta Dehler 34 SV 617.0 620.0 ‐0.49
Oxygen X‐41 566.2 568.8 ‐0.46
Teknova First 40 579.0 581.5 ‐0.44
Malin First 36.7 mod 615.9 618.1 ‐0.36
La Dolce Vita FINNGULF 33 637.1 638.7 ‐0.26
AVANTIME 2 FINN‐FLYER 42 553.4 554.2 ‐0.14
AIR IV Landmark 43 537.3 535.1 0.41

Hela listan finns här, inklusive internationella fleeten.

Här är några exempel från Norge:

Båt – Båttyp – GPH2013 – GPH2012 – Delta GPH%
Wolfpack TP52‐IRC 446.8 463.9 ‐3.83%
Camilla Cookson 49 Cant 455.8 469.4 ‐2.98
Santa Farr 400 513.0 526.5 ‐2.63
Mrs Freckles Farr 30 587.9 596.7 ‐1.49
Ille moro Bavaria 42m 582.4 591.1 ‐1.49
XANTHIPPE IMX 40 581.4 589.7 ‐1.43
Fortitude First 40.7 594.5 600.7 ‐1.05
FELICIA IV X‐382 MK2 624.9 631.4 ‐1.04
Wolfpack X‐41 OD 566.2 569.1 ‐0.51
Wasabi First 35 618.8 620.9 ‐0.35
Angelique A 31 623.5 624.5 ‐0.16
Magic King 40 565.7 561.0 0.82

ORC ANNOUNCES MAJOR NEW IMPROVEMENT TO 2013 VPP

On the occasion of its 43rd Annual General Meeting, the Offshore Racing Congress (ORC) is pleased to announce a major step forward in the accuracy of its Velocity Prediction Program (VPP) to be implemented for the 2013 sailing season. One of the principal elements of this program, the Residuary Resistance (Rr) formulation, has been revised to now be more accurate for a broader range of yacht types that race within the ORC fleet database.

The new Rr formulation used in the new VPP is producing theoretical predictions which are much closer to the measured performance data taken from numerous boats in the ORC fleet.

“We looked at this carefully to help validate our results. The implied wind calculations are also much closer to that observed on the race course,” says Alessandro Nazareth, Chairman of ITC.

The Rr project’s new formulation was the result of collating the relevant Delft Systematic data, analyzed by ITC member Kay Enno Brink and the CFD results coming from ITC’s Philippe Pallu’s work at CRAIN and the Fine-marine code work performed by new ITC member Jason Ker. Another ITC member working on this project was Andy Claughton of Southampton University.

“Validation of this new formulation has been very important to ensure that all elements of the fleet are treated fairly,” says Claughton. “Our tests indicate that if any race from the past is rescored using the new rule the spread of corrected times for the first 10 or 15 boats is reduced, sometimes by 20-30%. This is fantastic progress.”