Zincs on 34' CHB Tri-cabin Trawler

Satch · Jul 8, 2024

I have a 1978 34ft CHB Tri-cabin Trawler with a single Ford Lehman 120 engine and a Side Power bow thruster. How many zincs are there (or should there be) on this boat and where are they? From above the water, I can see one slab on the stern under the swim deck and one disc on the rudder. Where are the others on the bottom, and how many pencil zincs are in the engine?

Also, does anyone have a hull plan (mechanical drawing) for this boat? I need to determine block placement and height when we go up on our haulout rail.

CharlieO. · Jul 8, 2024

I have one on the stern and one on the rudder and one pencil zinc in the heat exchanger. I believe you should have one for the bow thruster also.

Tired Trawler · Jul 10, 2024

Greetings,

My F/L 120hp has an anode in the heat exchanger, engine oil cooler & gear oil cooler.
Hull has 1 divers dream plate anode on stern.
Prop shaft has 1 shaft anode between stern tube & prop.
Prop has 1 prop nut anode.
Rudder has 1 rudder anode.
Hope this helps.

sjnssn · Jul 22, 2024

Get an electician to do a zinc balancing measurement. Often boats are OVER zinked.

Tired Trawler · Jul 29, 2024

Greetings!
I agree with sjssn however having endured 2 major electrolysis attacks on a 37ft aluminum boat which resulted in major hull & outdrive damage I tend to err on the side of caution.
The afore mentioned attacks were a result of old leaking marina wiring & the boat tied up beside us, our boat tested fine.
As I have no control over marina wiring or who ties up near me,
I would rather overprotect my boat than go through the pain & expense of that repair again.
Hope this helps.

Zincs on 34' CHB Tri-cabin Trawler

Satch

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CharlieO.

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Tired Trawler

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sjnssn

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Tired Trawler

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