Re: Boat sive vs. wave periods LOL. There are so many factors that fall into play.
20+ years ago, when I was running a 25 foot Wellcraft Sportsman (Which is what the hull of your 215 is based on, BTW), I recall one instance where we were running into a big swell. A long-period, gentle swell of perhaps 8'.
I was humming along at just over 25 knots, and eventually found myself overtaking a 40+ Ocean Super Sport, that was on the same course. Just as I got alongside, the helmsman of said Ocean decided that he was not going to be outrun by a lowly, single outboard-powered Wellcraft, and proceeded to open her up. I did likewise.
At 31 knots, my boat was just barely getting "light" as it crested the gently rounded tops of the swells. That was not the case for the Ocean, as she was catching air and slamming back down, hard. Every time she did so, I cringed, imagining what was happening to the furniture (and occupants) of that boat. Eventually, the helmsman came to his senses and backed down.
The moral of the story? There's more than just a bit of truth to the old adage that "There is a sea for every boat".
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