The stock rudder for my Epic V10 surfski catches kelp and weeds so I decided to build my own "weedless" rudder as a replacement. Here's how I went about it. . .

Step 1: Materials

This is the second time I've made a surfski rudder. The first time I used marine plywood but this time I decided to use balsa since I thought it would be easier to shape and I would be glassing the outside for strength anyway.

The stock rudder is about 5/8 inch thick with a 3/8 inch diameter shaft. I bought a piece of 3/8 inch stainless steel rod from a metal supply store and balsa from a hobby shop. Two part epoxy resin and 4 oz. fiberglass cloth were left over from another boat building project so I used that.
i have done this intrestingly enough for a waveski needed five skegs, i built three large with a leading and tail end and used two smaller ones from a fish. the shape i used was closer to the shape of the original fins though... we dont have many problems with kelp in so-tex.
For the second rudder you might look at the many "weed fins" made for windsurfers. At swap meets, you can pick them up really cheap. Then, instead of fabricating/faring a fin from scratch, maybe you could just trim the existing windsurfer fin, rout a channel in it for the rudder shaft, and then bond/laminate the shaft in place.

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