RE: Slapping noise from waves on hull.
Most hard-chine boats will have some wave-slap noise, and it can be annoying depending on where your forward cabin berth is located relative to the chine. As mentioned, Nordic Tugs have a chine slap at anchor/mooring, and depending on your tolerance (or amount of rum), can be an issue. Moving from a full displacement sailboat (Island Packet) to a Nordic Tug in 2006, I was amazed at the amount of noise and resonance coming from the point where the water line meets the chine. After the first night on our mooring, I had to do something. Nordic Tug owners are familiar with a "wave-slap preventer", constructed with noodles sewn into sailcloth panels. I sewed together a preventer, and it works, but it was a pain to deploy, looked silly ("hey, what's that diaper on your bow"), and I didn't want that hanging under the bow if I had to get underway quickly. I had placed 4" of sound deadening foam in the bow, but that didn't do much.
Last year I filled in a 50" section of the chine using CoreCell foam, West epoxy, and carbon fiber tape. That eliminated the slap. I took photos of the wave deflection at various speeds betweem 6 and 14 knots, before and after the modifications, and there's no performance impact. NT's are semi-displacement hulls and will get up on plane. At over 8 knots the area filled in is out of the water. Nordic Tug hulls on the 32, 37, 42, and 54 share the same chine design and slap. Their newly designed 49 footer, available this year, has been redesigned to eliminate the slap issue.