I am trying to find a 'magic number' - a factor by which a boat is slowed down by the waves and choppy sea that are created when the wind and the tidal stream are coming from different directions. Say my boat is sailing at a speed of 5 knots through the water. If the wind is going with the tidal stream, the sea is calmer than if it's going against the tidal stream. It is different again if the two are moving at 90 degrees to each other. I am interested in peoples opinions and experiences about how much certain combinations of wind and tide slow them down - would you say if you have tide against the wind, it will slow you down by 10%? 20% I am not interested in the difference of boat speed through water vs speed over land - only in the difference that is caused by a choppier sea because the tide is going against or with the wind.
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Looking for the magic number in wind vs tide...
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