My guess is that the posts are the vertical axles for the two wheels (not sure "wheels" is the right word) on which the rudder cassettes are mounted. The rudder would certainly fail if one of these fail.
I can't see this being a flaw in the design, though. Because they are so short, and handle very little bending moment, these posts should have lower loads than a normal multihull rudder stock. And anything that fails due to corrosion is likely to... fail due to corrosion.
That said, I do look forward to seeing how the new beam-mounted design works on Blind Date this summer. It's a nice way to handle kicking up in both directions, balancing the rudder forces as they are raised, and concentrating forces on a very strong structural member.
- Mike
Doug Haines wrote:
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so it was 316 SS? rare bird was the board in case design lasts i recall.
was it changed to a post?
or you mean the shaft in the board was steel? very strange.
--- On Tue, 14/4/09, Robert <cateran1949@ yahoo.co. uk> wrote:
From: Robert <cateran1949@ yahoo.co. uk>
Subject: [harryproa] rare bird.
To: harryproa@yahoogrou ps.com.au
Date: Tuesday, 14 April, 2009, 9:28 PM
Rare bird suffered a corroded rudder post. It was supposed to be stainless 3.6.1. The posts are going to be replaced with carbon ones.
The owner reckons it was remarkably comfortable at 13 knots in a bit of a sea
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