thank god it's posted for all the world to see and I don't have to plow through that project again :-
But most important, happy to get the info out for all the fine boaters on this board
Understanding the CAPAC
Re: Understanding the CAPAC
-joel-
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD
Re: Understanding the CAPAC
As (un)luck would have it, the silver oxide portion of my unit fell off sometime during last season. I discovered this just after haulout in October. Had found Ward's Marine last week to check on replacement.
Got a call from.their tech who advised the whole "pie pan" thru hull unit has to be purchased (item - 37800). Cost is hideous - $747.18!!!
Think it's time to use a homemade unit. Just can't justify that kind of exhorbitant expense.
Bill
Got a call from.their tech who advised the whole "pie pan" thru hull unit has to be purchased (item - 37800). Cost is hideous - $747.18!!!
Think it's time to use a homemade unit. Just can't justify that kind of exhorbitant expense.
Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge to be sold (updtd 1-1-22)
"Sunset Seeker Too" (SS2)
'88 41' Marquis hardtop. (as of 1/1/22)
Located in Aurora, In.
Always fresh water.
"Sunset Seeker"
'88 32' Sedan Bridge to be sold (updtd 1-1-22)
"Sunset Seeker Too" (SS2)
'88 41' Marquis hardtop. (as of 1/1/22)
Located in Aurora, In.
Always fresh water.
Re: Understanding the CAPAC
Last edited by carl on Wed Jul 10, 2019 11:05 am, edited 1 time in total.
Re: Understanding the CAPAC
1959 Family Cruiser - Sold - Gary Dick - 12/05/14
1963 Express 31x10 - Sold - Joe & Ginger Tabor - 01/21/2017
1963 Express 31x8.5 - In Dry Dock - Restore Underway
1987 Sportsman - Lay Lake (Coosa River) Alabama
Big 's Rule !!!
Columbiana, AL
1963 Express 31x10 - Sold - Joe & Ginger Tabor - 01/21/2017
1963 Express 31x8.5 - In Dry Dock - Restore Underway
1987 Sportsman - Lay Lake (Coosa River) Alabama
Big 's Rule !!!
Columbiana, AL
Re: Understanding the CAPAC
Last edited by carl on Wed Jul 10, 2019 11:04 am, edited 1 time in total.
Re: Understanding the CAPAC
Last edited by carl on Wed Jul 10, 2019 11:04 am, edited 1 time in total.
Re: Understanding the CAPAC
Last edited by carl on Wed Jul 10, 2019 11:04 am, edited 1 time in total.
Re: Understanding the CAPAC
Yeah. I'd add a magnesium guppy to get the reading up a few points.
Jeff
Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
Re: Understanding the CAPAC
Last edited by carl on Wed Jul 10, 2019 11:03 am, edited 1 time in total.
-
- Site Admin
- Posts: 410
- Joined: Sat Jul 12, 2014 6:18 am
- Location: Kentucky
Re: Understanding the CAPAC
Many folks spend way too much time pushing the CAPAC button.
First your numbers while they may be a bit low there are other factors to consider.
1. Early freshwater cold temps. will lower the reading.
Why you ask? Pure fresh water is actually an insulator and a very poor conductor. Electron flow is reduced thus your neg. readings often will be lower.
2. Initial submersion numbers often will be lower and slowly rise.
Most of us are using the aluminum strip anodes on keel, rudders, and trim tabs. By added an over the side Mag anode your numbers will increase and will take most if all of the galvanic load off the aluminum anodes. Use a SS. brush and clean your mag anode several times a season and insure you have a clean ground for the clip. Most clip the cable to a stanchion.
3. As fresh water warms up and there is more suspended sediment, algae etc. numbers will also rise since the contaminated water is a better conductor.
I do not recommend using mag. anode strips on our Marinette Yachts. Even in fresh water they will sacrifice too quickly and you may find it too hot. Long term readings of above 1.05 can cause damage as well,
4. Double check your shaft isolation. If it is not isolated it will pull numbers down and no amount of mag. will correct it but will make it worse.
Do not be too concerned about rudder shaft isolation. Properly barrier coating and paint will effectively isolate the rudder blades. Anodes on the rudders will also protect them. It is really non issue if you have more recent SS rudder shafts and blades. Also most our M's use the Nylon backing glands which isolate well.
safe boating,
dave
safe boating,
dave
First your numbers while they may be a bit low there are other factors to consider.
1. Early freshwater cold temps. will lower the reading.
Why you ask? Pure fresh water is actually an insulator and a very poor conductor. Electron flow is reduced thus your neg. readings often will be lower.
2. Initial submersion numbers often will be lower and slowly rise.
Most of us are using the aluminum strip anodes on keel, rudders, and trim tabs. By added an over the side Mag anode your numbers will increase and will take most if all of the galvanic load off the aluminum anodes. Use a SS. brush and clean your mag anode several times a season and insure you have a clean ground for the clip. Most clip the cable to a stanchion.
3. As fresh water warms up and there is more suspended sediment, algae etc. numbers will also rise since the contaminated water is a better conductor.
I do not recommend using mag. anode strips on our Marinette Yachts. Even in fresh water they will sacrifice too quickly and you may find it too hot. Long term readings of above 1.05 can cause damage as well,
4. Double check your shaft isolation. If it is not isolated it will pull numbers down and no amount of mag. will correct it but will make it worse.
Do not be too concerned about rudder shaft isolation. Properly barrier coating and paint will effectively isolate the rudder blades. Anodes on the rudders will also protect them. It is really non issue if you have more recent SS rudder shafts and blades. Also most our M's use the Nylon backing glands which isolate well.
safe boating,
dave
safe boating,
dave
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain