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Author Topic: Strut protection  (Read 3099 times)

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Jack Hutteball

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Strut protection
« on: July 29, 2004, 08:28:00 AM »

My diver notified me that its time for bottom paint and that there is noticable corrosion on the strut.  He suggested that a hole be drilled in the strut and a zinc added there.  is thois recommended?  I have never seen any discussion on the board of anyone doing this.  I plan to haul the boat next week for paint, so this would be a good time to add this.  Thanks in advance.
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Jack and Ruth Hutteball
Mariah lll, #1555, 2001
Anacortes, Washington

Bill Jenks

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Strut protection
« Reply #1 on: July 29, 2004, 09:18:03 AM »

There is a zinc on the the strut on Unzipped. I did not put it on - I have changed it. It was put on by my dealer during commisioning. A hole was drilled thru the strut and a 3" diameter clamshell zinc intatlled.
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Bill Jenks
Treasurer C34IA
Unzipped  Catalina 34 #1484
BOB San Juan 21 #19
Tacoma WA

PAUL T.

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Strut protection
« Reply #2 on: July 29, 2004, 09:46:39 AM »

JACK....... I hope you don't have too much damage. I assumed most boats had strut zincs. When you install your new zinc be sure to sand down to bare metal on the strut so you have good metal to metal contact. Also when applying the zinc, screw it on and then tap it firmly with a hammer to seat it, then tighten it again. Treat your propshaft zinc the same way........PAUL
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Stu Jackson

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Strut protection
« Reply #3 on: July 29, 2004, 10:11:55 AM »

Jack
 
 Aquavite has a strut zinc in addition to the shaft zinc.  Always had both.
 
 Stu
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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Norris Johnson

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Strut protection
« Reply #4 on: August 01, 2004, 08:27:48 PM »

Mariposa has a 3 inch zinc I installed 3 yrs ago. I'm due for a haulout this year. I did all of the above suggestions submitted by everyone else.  :D
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Paisano
Catalina 36 MkII 95
Hitchcock, Texas

reedbr

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Strut protection
« Reply #5 on: August 02, 2004, 11:54:49 AM »

My '97 did not have a strut zinc when I purchased it in 2002.  Slight current damage was noted by the surveyor at that time.  A strut zinc was recommened by the surveyor which I installed.
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Brian Reed
1997 C34 mkII "Ambitious"
St. Mary's River, MD

Ron Hill

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Strut protection
« Reply #6 on: August 02, 2004, 07:11:35 PM »

Jack : I've never had erosion in the past 17 seasons with only a shaft zinc.  However, my shaft is isolated from the engine.  Interesting!
APACHE #788  :wink:
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Ron, Apache #788

rmbrown

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Re: Strut protection
« Reply #7 on: April 04, 2018, 12:42:26 PM »

Hmmm... just saw one on BlackDragon's survey video for the first time.  I'll be adding one!
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Mike Brown
1993 C34 Tall Rig Wing Keel Mk 1.5
CTYP1251L293
Just Limin'
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KWKloeber

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Re: Strut protection
« Reply #8 on: April 04, 2018, 03:32:52 PM »

Jack

A strut should have an anode if it isn't electrically bonded to something else that has an anode.
But it needs to be completely electrically connected to the strut (not "just" drill a hole.)

Are you on shore power or on a ball?

Some musings on anodes:
https://marinehowto.com/anode-installation-best-practices/

bookmark these
https://marinehowto.com
http://www.pbase.com/mainecruising/boat_projects


ken
« Last Edit: April 04, 2018, 03:52:08 PM by KWKloeber »
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

rmbrown

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Re: Strut protection
« Reply #9 on: April 05, 2018, 04:53:02 AM »

I can't speak or Jack, but his post was 14 years ago. :)

My boat is in a slip on shore power.

Mike
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Mike Brown
1993 C34 Tall Rig Wing Keel Mk 1.5
CTYP1251L293
Just Limin'
Universal M-35AC

KWKloeber

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Re: Strut protection
« Reply #10 on: April 05, 2018, 06:10:37 AM »

MIKE

OMG that’s funny. It was a long hard day yesterday.

k
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

Jack Hutteball

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Re: Strut protection
« Reply #11 on: April 05, 2018, 09:24:00 AM »

Yep, installed a zinc on the strut 14 years ago and have never had a problem, even with shore power on my dock.
Jack
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Jack and Ruth Hutteball
Mariah lll, #1555, 2001
Anacortes, Washington

Noah

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Re: Strut protection
« Reply #12 on: April 05, 2018, 10:50:14 AM »

I have a 4 zincs on my boat.
1. Prop Shaft
2. Strut
3. Flexofold prop cone nut
4. Heat exchanger
Make sure on the strut to remove any bottom
Paint/primer on the strut so that zinc makes full contact with strut.
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1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig

Ed Shankle

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Re: Strut protection
« Reply #13 on: April 06, 2018, 07:39:28 AM »

I’ve never had an anode on the strut and have not noticed any galvanic corrosion. I thought the cutless bearing isolated it from the shaft. Also, the shaft is isolated from the engine and the Flex o Fold prop has an anode, as does the shaft. Has anyone previously without an anode on the strut had a corrosion issue that was subsequently resolved by adding an anode to it?

Regards,
Ed
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Ed Shankle
Tail Wind #866 1989 m25xp
Salem, MA

John Langford

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Re: Strut protection
« Reply #14 on: April 06, 2018, 06:46:03 PM »

Yup, I have. When I bought my 1999 boat in 2003 there was mild “pinking” of the strut as a result of electrolysis. I put on a 3” clam zinc and no deterioration from that point.
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Cheers
John
"Surprise”
Ranger Tug, 29S
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