I bent a spade rudder on my newly-acquired MacGregor 36, and inspection of both rudders makes me think they have been bent and straightened more than once in the past. I think they should be replaced, but can't afford to have them professionally fabricated.
That leads me to try building them myself. I have found some information on how to go about it, including an old thread from Sailnet
, but I would appreciate any other advice or resources, online or elsewhere. I particularly need input on lamination schedules, designing the internal web structure, and how to prevent water penetration where the post enters the rudder.
Is there any reason to consider a different foil shape, or is MacGregor's design from 35 years ago good enough?
I'm considering carbon fiber posts, if (big if) I can find them or do a respectable job of fabricating them. I understand why many consider stainless steel preferable, but for my boat carbon might be a good idea for a couple of reasons:
1. With two rudders and two transom-mounted outboards, I have double redundancy in case a rudder is damaged. A shattered carbon post that can be completely removed might be preferable to a bent and jammed stainless steel post.
2. This lightweight catamaran is particularly sensitive to weight, and any savings, especially at the stern, are valuable.
Does my thinking make sense?