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post #30 of Old 10-02-2006
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Originally Posted by sailingdog
The main problem with fin keel/spade rudders is that in the case of a grounding or very heavy seas, there is very little support or protection for the rudder. This is not to say that spade rudders aren't seaworthy, but a skeg obviously provides the rudder a lot more support and protection than it sticking out into the water on its own.
Besides tracking straighter, I suspect also that the engineering stresses on a fin keel (deep, narrow, with a short attachment to the hull for its area) will be far greater than those on a full or modfied full keel (shallow with a long attachment to the hull); someone like Jeff H can probably give you a more quantitative analysis of this.
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