Originally Posted by HappyMdRSailor
I suggest that a composite shaft and associated framing is beyond the skill set of the average sailor... Just my opinion...
As to a carbon shaft- there's a discussion over here-
Carbon Fiber as a Replacement for Stainless Steel in Sailboat Rudders
Galvanic reaction will adversely effect carbon fiber, so one of the writers says.
We all want something to work and last a long time. Many ideas have been suggested here for material- carbon, stainless, fiberglass
Carbon fiber like any new material has its appeal and is suitable for some situations. Thanks to carbon fiber The America's Cup brought the word "ugly" to competitive sailing in the appearance of the boats and the crew's outfits- black, a symbol of death- a hearse. Sort of like Ishmael's declaration of the Pequod in Moby Dick.
For my boat I suggest a Schedule 80 (thick wall) Stainless pipe of some sort would be more than sufficient for the stock/post. Removal
of the rudder every year when the boat is on the hard
would preserve the rudder even more.
Just for some humor
consider this- make the stock from 2" PVC Schedule 40 pipe. Build the foil shape of the rudder from foam and then glass the foam over. Stick several lengths of 1/2" re-bar down the pipe and pour "water-plug" (or resin if you really want to be high-tech) down the pipe. Now, tell me- that's going to snap off? It will only after my transom has been ripped out.
If we ever buy another boat and it's a big blue water cruiser I'm certainly going to have the rudder and keel