Photos for R29 CB that collided with 3 logs + zinc servicing

baz

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Fluid Motion Model
C-24 C
Subject: Photos for R29 CB that collided with 3 logs + zinc servicing

A little over a month ago traveling at some 10 to 12 kts I hit 3 submerged logs that unfortunately collided with my hull bottom and worst of all, my prop. I posted about this here -> http://www.tugnuts.com/viewtopic.php?f=2&t=13538&hilit=bent

The prop has been repaired and at same time my underwater zincs were serviced.

The hull received little damage and had just a few scuff marks.

My boat has been in salt water for about 4 months at the time the repaired prop had been installed and with shore power connected most of the time as I was checking lots of things out and wanted to ensure my batteries were always fully charged. Now I only connect to shore power once every week for 24 hrs. That is, I remove the shore power cable from my slip's shore power pedestal as well as disconnecting the boat end from the boat to completely disconnect the boat from shore power issues that in the past without doing this has meant severe underwater zinc erosion at my marina. I anticipate I can go for at least 9 to 12 months before my underwater zincs get to be 50% worn away.

I assembled a set of photos showing the two adjacent prop blade tips being bent slightly (maybe 3/4" out of alignment). Also have included the underwater zincs before and after replacement along with crud being cleaned off the trim tabs and rudder.

Note also that the prop zinc was completely missing and have no idea if this was due to the log collision or that it simply worked its way off and fell off into the deep dark waters somewhere. 😱

Photos here -> https://www.icloud.com/sharedalbum/#B1AGY3uThGXvpAt

I hope others find this informative. 🙂
 
Baz, I have had a similar experience on another boat. I had a Skipjack 28 with two outdrives and I would need to change zincs every 2 months. It was awful. I added a solar panel and disconnected from shore power and the zincs would last the entire season.

On the shaft zinc on your boat I have also suffered from the missing zinc syndrome. Last time I put some red threadlocker on the bolt that holds the zinc on. I did this a couple of days before installation and just let it cure in the threads of the bolt. I am due to change the zinc again and it is still on there so that might be the trick.

Also, I have switched to aluminum anodes and they are lasting much longer then the zinc variants.
John
 
Do either of you have a galvanic isolator installed? I had one installed my R27 OB and it has helped a lot.
 
georgesilverman":3exd38f7 said:
Do either of you have a galvanic isolator installed? I had one installed my R27 OB and it has helped a lot.

No I do not have one of those GFI's installed. I tried one of those on my R25 Classic in same marina I'm in at this time also. It did absolutely nothing for prolonging the life of my underwater anode/zincs. The only thing that works flawlessly for me is to disconnect completely from shore power all week long with shore power connected just for 24 hrs each week. I live close to my marina so this method works for me.
 
I do have the galvanic isolator. It definitely helped with my anode wear. If you are having high anode wear I would try the aluminum anodes and see if they work better then the zinc. The anodes on our thrusters are aluminum.

If you can, I think disconnecting from shorepower is the best solution. However, that is not feasible for everyone.
 
Interesting, No, you're not getting me to spend money on it... 😉
 
SgtAlf":3sn5r80e said:
Interesting, No, you're not getting me to spend money on it... 😉

Well, you did ask.... :lol: They are great for night time fishing. :lol:
 
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