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Fleet from Saturday Lion Island Series 2025, compared on their ORC and IRC certificate data. Pick up to 2 boats.

Comparing two boats. Sign in free to compare up to 6 and use the full toolkit.

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and 232 more - search to narrow

In this fleet, no certificate linked yet - open a boat to add its ORC certificate link:

AlbeniaAllsail LeewardAUS353AvventuraBack in BusinessBlue TackBotany Access MC38BullwinkleCape FearChaos TheoryElysianFidraFlirtationGunner GoodwinHeavenLa Troisieme Mi-TempsLe MikaLuna BlueNo ExcusesOcean RangerPacemakerPanchaxRevolverRhapsodyand 12 more

To add any boat, paste its public ORC certificate link on that boat's profile page. ORC certificates and IRC published boat data also link automatically overnight.

Rated pace

The selection ordered by rating, fastest first. The gap is what the slower boat gets back in corrected time - per hour of racing under IRC, per mile under ORC.

IRCVENTO1.248+382 s/hrMERCURY1.142
ORCVENTO507+32 s/miMERCURY539

Gaps are cumulative from the fastest-rated boat in the selection.

IRC vs ORCwhere the two rules disagree

Every boat holding both ratings, two independent measurement rules assessing the same hull. The line is this fleet's trend; boats off it are the ones the rules disagree about. Hover for the size of the disagreement; click a dot to add the boat.

whole fleet
0.971.121.281.431.59387439491543595647ORC GPH, s/mi (faster boats to the right)IRC TCCabove the line: rated quicker by IRCbelow: rated quicker by ORCVENTOMERCURY
58 boats holding both an IRC and an ORC rating · dashed outline = expired IRC cert · hover lights up sisterships

VPP comparisons

Speed predictions from each certificate's velocity prediction program. Further out is faster at that angle; diamonds mark upwind and downwind VMG. Hover any point for the numbers.

12 kn
3kn6kn9kn52°75°90°110°135°150°wind
90°
90° beam
456789101112468101214162024true wind, knotskn

10 nm at 90° true in 12 kn:VENTO1:03:58MERCURY+5:58

Certificate measurements

Pick a family of measurements. The bar under each value shows where it sits in the range across the selection - longer means bigger, not better.

Hull formVENTOMERCURY
Length overall (m)11.8012.41
Max beam (m)3.413.96
Draft (m)2.892.48
Displacement (kg)5,0366,805
Wetted surface (m²)29.131.3
Stability index137.1126.4

Hull and stability numbers in sailing trim.

When they met

Races where at least two of the selected boats finished, scored under each measurement rating system the race carried - places are in the full division, margins in corrected time, exactly as the club published them.

Checking the results…

All figures come from each boat's public ORC certificate or IRC published boat data (IRC TCCs from club records); speeds are the ORC certificate VPP's predictions, not observed results. Measurements move together with boat size, so no single number explains a rating. The fairest comparisons are between boats of similar size or within one design classes.