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Old 12-18-2010, 12:15 PM   #1
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Rudder cracked

I had to remove both my rudders to replace the rudder logs which were leaking. It's difficult and perhaps impossible to replace the packing material in the log due to it's location. Upon cleaning the stbd rudder I noticed the cracks, shown clearly in the attached pictures. There are 2 cracks, one on either side of the housing.

<ul>[*]Anyone know how this could have possibly happened?[*]Can this be fixed?[*]Where do I get it fixed or replaced?[/list]
-- Edited by timjet on Saturday 18th of December 2010 01:15:56 PM

-- Edited by timjet on Saturday 18th of December 2010 01:17:09 PM
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Old 12-18-2010, 01:24 PM   #2
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RE: Rudder cracked

There are many fixes that will come your way on this timejet. The first thing I'd do is get the advice, replace*and/or repair cost from of the nearest GOOD boat shop who does prop, shaft and rudder repairs.

It is tough to tell from the photo how the shaft (SS?) is pressed or held into the rudder (bronze?). Assuming the shaft and rudder are not "dissimilar and causing emf issues, how I would do it:
--Pull shaft from rudder
--Cut out cracked portion
--Weld/buildup with bronze a new shaft insert area
--Drill the new buildup area*to accept shaft

But it may be cheaper or better to get new rudders and shafts
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Old 12-18-2010, 01:27 PM   #3
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Rudder cracked

Tom--- Just curious because I know next to nothing about metal fabrication. But would a possible solution be to drill a little "stop hole" or "stress relief hole" at the end of the crack to prevent it from propagating farther and then weld over the crack?

-- Edited by Marin on Saturday 18th of December 2010 02:28:08 PM
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Old 12-18-2010, 01:30 PM   #4
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RE: Rudder cracked

Thanks Tom.

The shafts are SS and the rudder bronze. It appears the crack goes completly through the bronze on one side but not the other. Didn't think about a prop shop but I just left my props at General Prop in Bradenton FL 4 days ago jso will take the rudder in when I pick up the props. I'll let you know what they say.
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Old 12-18-2010, 02:13 PM   #5
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RE: Rudder cracked

Yes Marin, that could be done, but in my opinion may not address the potential underlying issues. Another concern I'd have is the*different metals will expand*unevenly as welding occurs, so breaking the whole thing apart may have merit.*But the problem may have resulted initially from improper boring of the rudder for the shaft diameter, faulty design, Carver grabbing the wrong rudder from the shelf*or not enough meat on the rudder itself. Or maybe grounding caused the failure.
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Old 12-19-2010, 06:09 AM   #6
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RE: Rudder cracked

My guess would be the boat was backed into an object.

A prop shop will fix it easily.
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Old 12-19-2010, 08:09 AM   #7
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RE: Rudder cracked

How about an expanding shaft as a result of crevice corrosion or some other evil? My buddy's Carver lost both prop shafts to CC and the shop said that the SS shaft metal was of an inferior grade.
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Old 12-19-2010, 08:27 AM   #8
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Rudder cracked

Being cheap I would take it to the shop that does the work for the prop shop.* If you where in the Seattle area, the plant could probable repair or at least recommend a place.* We mfg pulp/paper/sawmill equipment and get into all kinds of metal. *The rating of SS and Bronze, is close*so welding repair should be OK.**If you have some quetions*I could ask th shop, so you sound some what knowldgable to keep them on there toes.*** *

The shop loves it when I come in carrying an odd looking boat part and/or my hand scribbled drawings.**Another of Phil's R/D*projects.* ***


-- Edited by Phil Fill on Sunday 19th of December 2010 09:30:06 AM

-- Edited by Phil Fill on Sunday 19th of December 2010 06:14:07 PM
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Old 12-19-2010, 11:32 AM   #9
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RE: Rudder cracked

Thanks guys, I'll post what the prop shop says, probably next week.

I'm looking forward to hearing their opinion as to what caused this. The pictures don't show it but there is some pitting on the SS shaft where it went through the rudder log. More on this one than the other rudder. I'll also bring that to the attention of the prop shop.
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Old 12-19-2010, 05:25 PM   #10
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RE: Rudder cracked

The pitting is CC.
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Old 12-19-2010, 10:13 PM   #11
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RE: Rudder cracked

keep us posted- I am curious what they suspect might have caused it...Doc sounds like he might be on to something though.
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Old 12-20-2010, 05:33 AM   #12
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RE: Rudder cracked

You might also consider adding a cross pin to hold both together as an extra insurance.
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Old 12-20-2010, 09:31 AM   #13
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RE: Rudder cracked

"You might also consider adding a cross pin ..."

While that might seem like a good idea at first, that could create more problems that it might solve.

A good welding shop (which might also be part of that good prop shop)*can gouge out the crack down and into the post material and weld the assembly together.

While they are taking care of the cracks they can fill those corrosion pits and straighten the post before returning it.

They might also find it cheaper to use an old aquamet shaft to make a couple of new posts with SS blade rudders.
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Old 12-20-2010, 10:14 AM   #14
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RE: Rudder cracked

Doc, what is CC?*
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Old 12-20-2010, 10:22 AM   #15
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RE: Rudder cracked

Crevice corrosion
Chris Craft
Canadian Club (rye whiskey)
Culture Club (Boy George)......
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Old 12-20-2010, 11:52 AM   #16
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RE: Rudder cracked

Country Club
Cubic Centimeter
Crash Course
Chris Cringle (KK's American cousin)
Community College
Course Correction
Coffee Can
Crash Cap
Common Cause
Creative Commons
Coca Cola
Credit Card

Oh curse you RTF for starting this ...
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Old 12-20-2010, 12:40 PM   #17
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RE: Rudder cracked

Maybe CC does stand for coffee can. That's about the same quality of material that the shop told my buddy that his shafts were on his Carver when it suffered from CC.
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Old 12-20-2010, 02:36 PM   #18
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RE: Rudder cracked

My grand kids are coming in a few days so it will definitely be a Calamitous Christmas filled with Clam Chowder, Crunchy Candy*and*Carmel Corn for treats and Cockapoo Crap to Clean Continually.

Common Curse you RT, where will this lead?
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Old 12-20-2010, 02:52 PM   #19
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RE: Rudder cracked

Could create continuous contributions that consistently corrupt the content of*complementary communications!
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Old 12-23-2010, 10:10 AM   #20
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RE: Rudder cracked

Timjet, what is the prognoses/status? **
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