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post #11 of 15 Old 11-03-2013
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Re: Draining Water from Rudder

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Originally Posted by swallace11 View Post
.....I guess that this relys on the fact that corrosion underwater in absense of air is limited.....
Corrosion of stainless steel is caused by this, as stainless relies on a microscopically thin layer of oxidation to prevent the steel from rusting. This layer does not form or replenish in the absence of oxygen, therefore, the iron is at risk. Read up on crevice corrosion.


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post #12 of 15 Old 11-03-2013
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Re: Draining Water from Rudder

E and I have huge rudders.
It behooves us to take care of them LOL

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post #13 of 15 Old 11-03-2013
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Re: Draining Water from Rudder

The rudder armature has failed on two of the nine Tartan 30's at the Club where I'm a member. As I recall, both required significant repairs to the skeg shoe while the rudder was off.
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post #14 of 15 Old 11-03-2013
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Re: Draining Water from Rudder

If rudders eventually fill with water, why not design a rudder that can be submerged and inspected. I'm thinking a few basic structural components such as ribs and spars(rudderpost) with a covering of plastic, riveted on. The shape is the same and with holes on the top and bottom it could fill with water, then drain when hauled out.

Anyone see anything out there like that? With a roll of plastic, rivets and some spare ribs you could even keep a spare rudder stored on board unassembled.


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post #15 of 15 Old 11-04-2013
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Re: Draining Water from Rudder

Rudders that do not suffer from water absorption have been designed and built. The problem is that the stainless rudder post and armature inside and the fiberglass covering it have different expansion rates, making it impossible to seal the fiberglass to the rudder post for the long term. The post and rudder have to be made of the same material. Carbon fiber rudder posts are used on some boats and don't have this problem. Expensive though.

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