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Old 08-02-2016, 12:54 AM   #1
oak
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Mainship Pilot 34 Rudder Shoe

Should there be a bearing in the rudder shoe. I hauled the boat today and noticed an approx. 1/4 inch space between the
rudder post and the shoe is this the way it was built or should there be something to fill the space?
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Old 08-02-2016, 06:43 AM   #2
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That seems like to much space IMO. Enough space that you might hear a rattle from the prop wash in certain situations.
If it were me, I'd fit a closer fitting bronze (or stainless to match the shoe material) bushing.
I did that on my old 34 model I.
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Old 08-02-2016, 07:17 AM   #3
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Thanks for your response. Do you know if there was a bushing in the shoe originally. It does not seem that there is enough room
for a bearing. Did unbolt the shoe to install the bushing? If shoe was removed did that creat any issues?
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Old 08-02-2016, 09:41 AM   #4
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Remember mine was an old model, totally different that the pilot.
I don't know for certain whether the pilots have a bushing. My old model did not, it was just worn and had more play that I liked.

Since I did not like the way it was fastened to the keel I removed the shoe/skeg and modified the bolt holes as well as having the rudder hole bored open for a bushing. Clearance between bushing and post was about .020-.030 " diameter as I recall.
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Old 08-02-2016, 10:50 AM   #5
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oak:

The following is a pic of my 2003 Pilot 34's rudder and shoe (with the faired deadwood, which did not do any good for high speed cavitation). I am pretty sure that there was no significant clearance between the pin at the bottom of the rudder and the shoe on my boat. There certainly wasn't any play in the rudder.

If you have 1/4" of clearance, that sounds like more than there should be, but does it matter? Do you feel any prop vibration back through the helm particularly at low speeds. I know that my Island Packet sailboat with the same rudder/shoe set up would vibrate at the helm at 5 kts or so. The solution was a bushing in the shoe.

So if you do see problems, then you could drop the shoe, have a bushing made up that fits more tightly around the rudder pin, enlarge the hole in the shoe so that the bushing fits and put it all back together.

But, if it ain't broke, don't fix it.

David
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Old 08-02-2016, 02:59 PM   #6
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Thanks all for your input. The boat in named Miru and is a 2007 pilot. There is no vibration at any speed. There is only a slight movement if I exert considerable force at the bottom of the rudder. The shaft stuffing box and upper shaft support are good. I think at this point I will measure the existing condition and monitor any change.Click image for larger version

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Old 08-02-2016, 04:02 PM   #7
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oak:

I see that your deadwood is faired around the cutlass bearing. Was that factory practice in 2007 or was it done after it was built. It looks exactly like my fairing job which didn't do any good. Mine cavitates a bit at WOT, but little to none at a cruising speed of 14 kts. See the pic below before fairing.

Doing nothing for now and monitoring is a good solution given that there is no vibration.

David
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Old 08-02-2016, 08:51 PM   #8
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The boat is new to me so I have can not compare the performance of the boat with or without the faring. 2800 rpm seems to be a comfortable cruising speed doing approx 14 kts. I have not noticed any cavitation at wot about 3300 rpm. I need more time to monitor the performance. Very different from my previous boat, a 36' trawler which I cruised for about 10years at 7kts and before that a sail boat for 18 years.
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