5 Metre is a development sailing class of French origin.
History The 5 Metre rule was created in France in 1929 and not an according of the International rule in contrast to other Metre yachts.
The formula The measurement formula is given in the 2021 International Five Metre Rating Rules:
where = length for rating (as defined by rule 3.4) = measured sail area = freeboard in metres (as defined by rule 3.5) = width in metres (as defined by rule 3.6)
See also 5.5 Metre
References
External links The Five – sporty open racer for a group of three