Nordic Tugs 37 Owner Invents Wave Slap Preventer

Nordic Tugs 37 Sea Mischief, with her wave-slap preventer deployed

Dick and Mable Seymour loved their Nordic Tugs 37 Sea Mischief, but there was a quirk that bothered them. When at anchor, the hard chine of the hull, close to the bow where it crossed the waterline, would sometimes create a rhythmic slapping noise from the waves in the anchorage.

While many other owners either don’t notice it or don’t mind it, the Seymours decided to do something about it, creating what they call the Wave Slap Preventer, a device designed to restore quiet at anchor.

Here is the project as described by Dick Seymour, on the NorthEast Nordic Tugs Owners Association website:

“In response to the wave slap noise that is characteristic of Nordic Tugs and many other hard-chine boats, I attempted several solutions. These included small fenders linked end to end and swim noodles alone. I found it impossible to hold any stand-alone devices like these in place under the chine.

These are key pieces of the wave slap preventer made by a Nordic Tugs 37 owner.

Therefore, I had my canvas man make up two panels of sailcloth with integrated pockets for two swim noodles. The top picture shows the two panels laid out flat. The pocket for the swim noodles is also visible. A second picture of the end of the swim noodle pocket shows the size and fit for the two swim noodles in each pocket. The end of each pocket is “tacked” down so that the noodles won’t slip out, but can be easily detached to remove the noodles if desired.

The two panels are connected together with three small lines that slip under the bow when the Wave Noise Preventer is deployed. These lines are sized lengthwise to keep the pockets tightly snug under the flat chines right at the water line. The panels extend about 2 1/2 feet forward and aft of the point where the waterline meets the chine.

Detail of the wave slap preventer for Nordic Tugs 37

The combination of the swim noodles (in their pockets) tightly against the flat chine and the sailcloth on either side of the pockets hold the Wave Noise Preventer in place and stops the noise generated by small wave slaps on the chine. It does take two people to “scoot” the Wave Noise Preventer into place and secure it tightly.

“The sailcloth panels each have 6 grommets for the connection lines that slip under the bow as well as the lines that attach to stanchions on the deck which hold the Wave Noise Preventer in place. The panels are 5 feet 8 inches long. This length accommodates standard length swim noodles. Each panel is 18 inches wide on the bow end and 24 inches wide on the aft end. The pockets are on a slight angle from bow to stern with the stern end down about 4 inches or so on the sailcloth panels.

I did a formal sea trial of the Nordic Tugs 37 with the late Jim Cress, former president of Nordic Tugs.  The NT-37 is a nearly perfect liveaboard cruiser for a couple, with its spaciousness and seaworthiness.  You can read that review here.

Copyright ©  2008 by OceanLines

Posted by Tom

Tom Tripp is the owner of OceanLines LLC, the publisher of OceanLines and founder of Marine Science Today. He is an award-winning marine journalist, science writer and long-time public communications specialist. His PR career and much of his writing stems from the fact that he loves to explain stuff. It all began when he and his brother Mark threw all of Mom’s tomatoes at the back wall of the house. . .