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Old 10-11-2012
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Re: rebuilding a rudder and boom question

Quote:
Originally Posted by Rxboat View Post
I will need to make a new rudder because the old one got water under the fiberglass and water logged and rotted the wood. The boom for my sailboat is basically a 2X4, 11ft long, too badly weathered and has splits and sharp edges all along the groove that holds the sail - these could cut or tear the sail. So I need advice on materials to use for the new pieces.

The rudder I plan to make using plywood doing a lot of sanding in order to shape the thickness and then cover it completely in fiberglass, then paint it with white gel-coat. My question is can I use a (I will not use any pressure treated plywood) such as AC exterior grade plywood instead of marine grade plywood in order to save money on the cost of the plywood since I will be encasing it in fiberglass and painting it anyway. The plywood will have voids when I am finished planing and sanding it to shape, but these will get filled up with the resin and fiberglass.

The new boom I will make using either cedar or redwood (because these are somewhat resistant to water) then paint it with white gel-coat or marine paint. I don't know if these are the best woods to paint over, I hear they have natural oils that tend to make it harder for paint to adhere well over time. Any thoughts about these plans I have?
Cedar & Redwood aren't great choices for a boom. They are a bit brittle. I'd use Douglas fir if you can't get some good Spruce. Varnish is better than paint in this instance because it lets you see any problems developing in the wood. Paint hides those problems.

Faster has it right about the rudder.
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