I've been using a scroll saw to cut the grooves. You could also use a band saw, jig saw, or hacksaw. I had an extra fin for my recent project and attached a photo. It's 3/16" Lexan, so sorry it looks a little weird in the photo. However, you can see the cuts. After the cuts, I blow out all the debris with an air compressor. Also I use the compressed air to clean the MMT after roughing it up. This greatly increases the amount of surface area for the bond. Please let us know how the fin attachment works. Richard On Sun, Aug 19, 2012 at 11:14 AM, Mike Ostby <mdostby@xxxxxxxxxxxxxx> wrote: > ** > I'm going to try Richards suggestion today regarding fin attachment. I'm > scratch building my first dual deploy and today is fin mounting day. It's a > 4" BT with a 54mm MMT so there's not a lot of room to lay up fiberglass > - fin to MMT. (They will be glassed to the BT). So that I understand it > correctly, I need to "notch or groove" the root edge of the fins many times > aprox 1/8" deep? Thus sort of creating a serrated edge giving much more > surface area for bonding. Thinking of just using a bench grinder (the edge > of the grinding wheel) to make the notches. Is this the idea Richard? I've > not epoxied the aft centering ring yet so I'm able to still apply fillets. > > Mike Ostby >
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