On Mon, 21 May 2012 21:17:54 -0400, John H.
wrote:

I'm still of the opinion that 6" crests six feet apart are no worse than 6" crests one foot apart.

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That's because 6 inches is small relative to the size of your boat.
Change the proportions to something like 4 feet 40 feet apart vs 4
feet 400 feet apart.