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Fins are small – do fractions of a mm matter?

To us fins are small, but water molecules are really really small! And as far as they are concerned fins are big. How small is small? 0.278 nano meter  – a nanometer is a billionth of a meter. So the number of water molecules in contact with your fin is quite beyond comprehension and 0.1mm is like a cross country flight to a water molecule. So yes very small differences matter, in fact it is extremely difficult to see the difference between a good fin and a bad fin with the naked eye which is why anything hand foiled is a real gamble.