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=================At the UK's biggest winter series, the SailJuice Global Warm Up, they use yardsticks that are probably more accurate that the official RYA numbers. This is because they are based on levelling out the performance of the top boats, rather than averaging across all boats in a class (so the RYA numbers include old, outdated versions of boats when calculating a PY).
Anyway, the Moth have a yardstick on the SailJuice scheme of 555. That compares with 695 for the new rig 49er and 1118 for a Laser. No cats allowed, so no number. The official RYA PY for a Moth is 600, and the Tornado is 644.
On its day the Moth is still unbeatable on 555 (they took a clean sweep at the Bloody Mary), but in other conditions that seems a reasonable number.