board 1: It's a quad fish!

I decided on quad fins, using future fin boxes.

I agonized over fin placement, cant, and toe-in (the last two are the tilt and rotation of the fins) for a while. Finally I took measurements from various posts on Swaylocks.com.

The front pair will have 1/4" toe-in, the back pair no toe-in. The future fins have cant in the fin, as opposed to in the box, so you only need to worry about getting the box horizontal. The front pair of fins is located as follows: trailing edge of each fin is 1,5" from the rail, 12" from the tip of the fish tail. The back pair has trailing edge 2" from the rail and 6.5" from the tips of the fish tail.

These specifications also agree well with the twin keels on the original blue fish I'm copying. The two fins on each side of the quad basically replace one of the keels.

Today I marked the location of the boxes, and the areas to route out, and routed out one of the fin holes using the dremmel tool with a router attachment. It was slow, but not too difficult. The fin sits in there snuggly.