the IR* scheme is based on metrics where as PY is based on mean performance so there is no way to do a meaningful conversion. However both schemes are linear WRT calculating corrected times so you could compute a rule of thumb - but it would only be good enough for an initial club value. It’d also be a good idea to get a copy of YR2 from the RYA to see how to adjust PY values for different keel configurations etc.
I do this to get PY values for cats by using the ISAF SCHRS values but only as a last resort.
Does Sailwave have any facility to do an easy conversion by formula from IRC
ratings to PY, to permit IRC yachts to race in a mixed fleet?
Does anyone have a formula for this?
Thanks, from Dabchicks Sailing Club, West Mersea, Essex.
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