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Old 10 September 2011, 08:49   #21
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Country: UK - Scotland
Boat name: imposter
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Originally Posted by frankc View Post
The equation comes from Chapman's book and is a pretty dependable method.
I think it may well be sound in "open seas" when the wind has been blowing constantly for some time. But for conditions where you are likely to take a SIB the local effects of land, and the effects of wind with/against tide seem to be more important than wind speed alone. My decision to go to sea is usually based on what it looks like on the day, the inshore waters forecast (which includes sea state) along with an understanding of wind direction on where I am going. My decision to go to the boat yard in the first place is usually based on simply on the wind. I'll not normally plan to go out unless it is F4 or less in my little tub. Even in F4 i'd not usually be taking the kids or planning long exposed trips.
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Old 10 September 2011, 09:29   #22
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Well, we have managed to scare the dickens out of the OP which we did not mean to do.

My plans when going out are quite simple:

5 to 10 mph winds, go for it.

10 to 15 mph, watch conditions at the area where I plan to launch the boat and pay close attention to wind direction. If it looks bad, return home or select a better launch site. You will get wet out there.

15 to 20 mph, stay in protected rivers only, but watch tidal flow vs wind direction. Don't even think about going out on open water, as the transition from river to ocean will be bad. Even a river can be rough if the water flow and wind oppose each other.

20 to 25 mph, go do something else and forget boating.

The whole thing boils down to using common sense and your eyes.

As far as Chapman's book goes, it should be required reading for anyone contemplating going out on big waters. It is a standard reference book for mariners.

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Old 10 September 2011, 15:27   #23
m chappelow's Avatar
Country: UK - England
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Originally Posted by frankc View Post
20 to 25 mph, go do something else and forget boating.
and as i said sooner or later youll get your arse wet.



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