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post #26 of Old 07-22-2009
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You can take GPS readings to the bank. They are a measure of the boatspeed OVER the GROUND and given enough current, enough of a wave to surf down in a semi-displacement manner...any speed over the ground is possible.
The speed through the water in a displacement boat is another matter entirely and is limited to 1.34* the square root of the waterline this case, about 6.7kts.

Given the tidal currents in Rammin's neck of the woods, I think the 15kts is quite possible as I've been in currents myself that took me from 5kts to 14kts in a matter of seconds and even Tartan 30's can surf a bit!

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