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 Post subject: Re: Sacrificial Skeg?
PostPosted: 06 Apr 2018 07:10 
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Tactictian

Joined: 04 Aug 2013 13:33
Posts: 109
55 hp must push the boat to hull speed with power to spare. I wonder if "...vibration and wash over the rudder at higher rpm when motoring" might be cavitation...?

The amazing thing is your Yanmar is probably noticeably smaller than the old Westerbeke. I looked over the models at a boat show once and was amazed how small they were compared to the Yanmar I put in my old boat years ago.

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Dave Lorick
Lunacy #198
Tampa, FL


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 06 Apr 2018 18:33 
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Skipper

Joined: 29 Dec 2006 09:38
Posts: 448
Chris, it actually looks like the lower pintle and gudgeon is missing on your boat. Not sure how important it is, but I do not recall any other lower bearing in that assembly. Perhaps someone modified it and put a lower bearing in it?
Ray Durkee
Velera
T37
#373


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 07 Apr 2018 07:48 
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Tactictian

Joined: 04 Aug 2013 13:33
Posts: 109
Ray, could you explain further? What lower bearing do you refer to? I thought there was only one pintle bar & pin that holds the rudder from dropping down and the image posted is exactly what I would expect to see with a rudder installed without a skeg.

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Dave Lorick
Lunacy #198
Tampa, FL


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 09 Apr 2018 06:19 
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Skipper

Joined: 21 Oct 2006 15:36
Posts: 239
I had my skeg torn off by a lobster pot buoy a few years back. The pintle remained in place supporting the rudder. I didn't even know it was gone when it happened. The boat performed normally. I noticed it was gone the next day when on a mooring. I did notice over the next few days that my auto bilge pump was periodically running when it rarely ran in the past. To make a long story short, I had no structural damage, but found that, when powering at hull speed, water was being forced up the rudder shaft to the point where it was over flowing into the bilge. What I learned that, on my boat anyway, the skeg deflects the prop wash and prevents the rudder post over flow. I did replace the skeg, over flow was eliminated. I also installed a pipe plug at the top of the rudder post.

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Jim Voelxen
Odyssey #191
Home Port: Osterville, MA


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 09 Apr 2018 07:32 
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Tactictian

Joined: 04 Aug 2013 13:33
Posts: 109
Isn't there a stuffing box and packing at the top of the rudder shaft that keeps water entry down to a weep? I plan to renew the packing there at next haulout, but I haven't had it apart yet.

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Dave Lorick
Lunacy #198
Tampa, FL


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 09 Apr 2018 19:10 
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Skipper

Joined: 21 Oct 2006 15:36
Posts: 239
There is a packing gland around the outside diameter of the rudder post under the steering quadrant.

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Jim Voelxen
Odyssey #191
Home Port: Osterville, MA


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 15 Apr 2018 14:53 
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Rail Meat

Joined: 26 Apr 2017 15:35
Posts: 14
Velera wrote:
Chris, it actually looks like the lower pintle and gudgeon is missing on your boat. Not sure how important it is, but I do not recall any other lower bearing in that assembly. Perhaps someone modified it and put a lower bearing in it?
Ray Durkee
Velera
T37
#373


Hi Ray. My lower pintle and gudgeon are there. You can see the bar and 4 bolt heads if you zoom in tight on the picture.

I did also notice the wash up the post a bit, but it's not something we can't live with for now.

The 55hp is wider than the Westerbeke, but does not take up as much space fore and aft. We are cruising at about 6.25-6.5 knots at 1800 rpm. At 2200rpm we taper off at a little over 7.5. anything more than that and we bury the exhaust!

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Chris Duer
Waterborn
Hull 369
Beaufort, SC


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 16 Apr 2018 12:29 
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Tactictian

Joined: 04 Aug 2013 13:33
Posts: 109
I see two posts that refer to 'lower' pintle - isn't there only one?

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Dave Lorick
Lunacy #198
Tampa, FL


 
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 Post subject: Re: Sacrificial Skeg?
PostPosted: 23 Apr 2018 07:25 
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Skipper

Joined: 21 Oct 2006 18:12
Posts: 246
Yes there only is one just above the skeg and it gets held in at the top thru a stuffing box,

Richard


 
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