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Old 05-09-2011, 11:03   #16
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Re: Rudder Gone . . .

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Originally Posted by sww914 View Post
16mm is smaller than the diameter of my thumb. My Nacra catamaran had pintles that size. Somebody gave you some bad information.
I agree. Or I just misunderstood the annotation on the plan...:-)
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Old 05-09-2011, 11:08   #17
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Re: Rudder Gone . . .

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I lost the rudder on my Hunter 25 about halfway between Key West and Havana....

Fabbian
Wow! Sounds like a real adventure! Since FP assured me it is not possible these fall-off without actually hitting something, I leave this for the Insurance company (with my USD 2K deductable...
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Old 11-09-2011, 17:45   #18
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The shaft is definitely bigger than 16mm, I'm about to change the stb rudder bearing on my Lavezzi and you've got me a bit worried now.
Was there much play in the bearing before the shaft broke?
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Old 11-09-2011, 17:51   #19
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Quote:
Originally Posted by Patacha

Wow! Sounds like a real adventure! Since FP assured me it is not possible these fall-off without actually hitting something, I leave this for the Insurance company (with my USD 2K deductable...
Hmmm, FP say a lot of things so I hope your insurance company comes to the party.
Please keep us posted on developments and thanks for sharing.
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Old 12-09-2011, 07:44   #20
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Re: Rudder Gone . . .

G'Day Dragon Lady, If you are still in Bowen, you could check your rudders b4 coming south on the beach just to the left of the jetty as you come into port. There are not too many places your size cat can be lifted on the east coast. It was used in WW2 for flying boat base.

regards Bill
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Old 12-09-2011, 14:10   #21
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Re: Rudder Gone . . .

Hi. I went to see the boat, and gues what.... a magnet sticks to them! That may imply they ARE NOT INOX but maybe 306! I have to cleaer this with FP! tHe is true on both rudders....! Did anyone check his? Ron.
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Old 12-09-2011, 15:27   #22
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Inox is just the French term for stainless steel so being magnetic does not mean it's not SS.
Have you worked out the cause of the failure?
Anyone with some basic metallurgy knowledge should be able to help you determine the cause of the failure.
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Old 12-09-2011, 15:29   #23
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Quote:
Originally Posted by bill good
G'Day Dragon Lady, If you are still in Bowen, you could check your rudders b4 coming south on the beach just to the left of the jetty as you come into port. There are not too many places your size cat can be lifted on the east coast. It was used in WW2 for flying boat base.

regards Bill
Thanks Bill, I know I've got a worn rudder bearing and the local slipway can lift me I just don't have time to do it up there.
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Old 12-09-2011, 18:57   #24
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Re: Rudder Gone . . .

Getting the local yard to make 2 rudders might be the best approach. You might need the second when you get to inspect the other rudder.

Not sure where you are but getting stuff from France can be slow (and expensive).
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Old 14-09-2011, 03:04   #25
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Re: Rudder Gone . . .

Thanks, DTM.

FP were extremely resposive, fast and reasonablly priced. The rudder was ready in three days (EUR 1,350 - including Al tube and bearings); shipping is Fedex 7-8 days @ 350.

Asside from the fact the post is NOT INOX (316), FP gets flying colors.

I did not replace the other rudder, for there is no signs of excesive corrosion or a problem there, and since it was pretty much established by the surveyour, yard and me that the primary reason for the incident is a trauma, and not wear.
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Old 14-09-2011, 03:20   #26
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Re: Rudder Gone . . .

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Inox is just the French term for stainless steel so being magnetic does not mean it's not SS.
Thanks DL. For most people, INOX is 316 SS - But you are right.
It seems though that they are using 304 or 302. I would expect a rudder shaft to be 316...
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Old 17-09-2011, 15:05   #27
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Wouldn't 316 be a bit soft for a rudder shaft?
I would think 304 would be better due to it's strength, because the shaft is on plastic bearings the electrolysis shouldn't be that bad.
Is there heavy corrosion on the shaft?
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Old 17-09-2011, 15:57   #28
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Re: Rudder Gone . . .

Dragon Lady,
Check 2205 s/s instead. Also check for voltage developed between the different metal parts with a volt meter. The plastic does not prevent electrolysis. A bonding wire can prevent electrolysis often taken for corrosion.

Regards Bill
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Old 05-10-2011, 13:36   #29
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Re: Rudder Gone . . .

New rudder arrived in three days from FP to Greece!

Conclusion: please see photos. Shaft is clean near the breakage (where it sits inside the bearing); does not look like electrolysis.

DL: Electrolysis can not occur without electric current; curent=contact between metals; plastic is NOT conductive. The SS is conpletly insulated from The Alluminum. Besides, if any, the Allumium (sleeve) would give awayto the SS (304?) - it did above the bearing (see photo)...

It looks like a stress inudced corossion/electrolysis (metal eats itself) due to torque shock/trauma.

I've sent photos to a Metalorgist for analysis; will advise once answered.

Boat is back in the water :-) Happy sailing, guys.
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Old 05-10-2011, 14:01   #30
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Re: Rudder Gone . . .

now that's scary...good thing you HAD two!! can a cat be steered with sails???

Just read your last reply...

How in the world can you ever trust that boat again? or at least the rudders!
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