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Author Topic: Cracked rudder advice?  (Read 360 times)

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dfloeter

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Cracked rudder advice?
« on: April 26, 2019, 02:05:32 PM »

Leaning on the collective wisdom again.
I dropped the rudder to pull the shaft and found a crack on the forward side of the rudder, at the top and above the step. It looks like itís been there a while and is well painted over. Due to itís position the crack was not visible before.
I am thinking I need to grind the area back, V grind the crack, fill with epoxy and put on a few layers of cloth as strapping to hold it all together. 
Is this overkill? How much stress do we have up there?
« Last Edit: April 26, 2019, 06:42:37 PM by dfloeter »
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Dietrich Floeter
Traverse City MI
1996 Catalina 34 TR WK #1317
Universal M35A
Rocna 15

Stu Jackson

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Re: Cracked rudder advice?
« Reply #1 on: April 26, 2019, 03:35:20 PM »

Dietrich,

Good you found that.  The most pressure is closer to the top and near the shaft.  Regardless, your "cure" sounds very appropriate.

There are a number of rudder articles in the Tech Notes Online.  I find the Knowledgebase helpful in finding them.  Many have to deal with "leaky rudders" which comes from the type of issue you describe.

Good luck.
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Ken Juul

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Re: Cracked rudder advice?
« Reply #2 on: April 27, 2019, 06:22:08 AM »

When I upgraded to the new eliptical rudder I disected my old one.  took about 2 hours of banging and sawing, they are made very strong.  I would start with the grinding to see how deep the crack is.  May only be on the top layer.  If deeper I would call Catalina and ask, they are very helpful in situations like this.
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dfloeter

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Re: Cracked rudder advice?
« Reply #3 on: April 27, 2019, 06:59:41 AM »

Thanks Ken, I just ground out the crack and it went all the way through to the post. The FG skin was cracked all the way down to the step.  There is also a crack on top.  At this point Iím going to grind the main crack on a good taper and reglass it.  I think that is what Catalina would likely recommend.  Onward with the belt sander!
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Dietrich Floeter
Traverse City MI
1996 Catalina 34 TR WK #1317
Universal M35A
Rocna 15

Rick Roberts

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Re: Cracked rudder advice?
« Reply #4 on: April 27, 2019, 08:31:16 AM »

If you ever consider switching to a elliptical rudder. I have one for sale  8) PM is you're interested.
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dfloeter

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Re: Cracked rudder advice?
« Reply #5 on: April 27, 2019, 01:41:30 PM »

Thanks but I think mine may already be elliptical, and now much stronger.   5 layers of cloth including 2 of roving and it laid up nicely.  Thanks all.
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Dietrich Floeter
Traverse City MI
1996 Catalina 34 TR WK #1317
Universal M35A
Rocna 15

Ron Hill

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Re: Cracked rudder advice?
« Reply #6 on: April 27, 2019, 01:53:26 PM »

Detrich : Look in the Mainsheet tech notes and I recommended gouging out the area where the stainless column goes into the rudder layup and fill it with 5200 as well as the your vertical crack.

A few thoughts

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dfloeter

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Re: Cracked rudder advice?
« Reply #7 on: April 27, 2019, 02:41:51 PM »

Thanks Ron and I think I can still do just that and I have a tube of 5200 that still seems usable.
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Dietrich Floeter
Traverse City MI
1996 Catalina 34 TR WK #1317
Universal M35A
Rocna 15
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