Steve, I have a Lavranos-designed aluminum 13M cutter. The bottom has 6 coats of Interlux 2000e epoxy barrier and a couple of coats of Interlux “trilux 33” bottom paint. What brand of bottom paint do you use in warm climates. Thanks.

Please can you help. We are new to boating and have a 40ft sailboat – recently the fuel tank was overfilled and as a result a valve in the gage popped and allowed a considerable amt of fuel into the bilge. I had just cleaned, polished etc the entire inside of the boat to make it smell OK after being closed up for some time and now it smells like the inside of a diesel tank!! Do you have any suggestion what we can do to help eliminate the smell – we are at Hastings, Victoria Australia and everyone here says we just have to live with it and it will diminish in time – I want to try anything – I get sea sick. Your comments will be appreciated. Thanks Bev

Dear Mr. Dashew, I am a cruising sailor planning on taking delivery of a new Hylas 46 in June 03. I have been investigating traction battery options since reading your Tech Talk Battery Maintenance article on SetSail. In addition to the Trojan alternative source mentioned in your article, Yuassa and IBE also manufacture traction batteries. I am particularity interested in IBE as they are a “local” manufacturer to me and the boat will be commissioned in Long Beach. IBE batteries are about 40% less expensive than the source you recommended and they appear to have good life expectancy (1500 cycles @ 80%)and a 5/15 year warranty.

Since they have been available for many years, I wanted to know if you had had any experience with them and, if so, could share that experience with me. The 40% cost deferential saves me over $1200 on a 1000AH 12V bank so I would like to have additional info to make an informed decision. I look forward to your response. Best Regards, Phil

Steve: In the section on engine exhaust systems in your Cruising Encyclopedia you indicate that the exhaust hose should be suspended on flexible mounts to limit noise transmission. In fact, there is a photo of that arrangement that shows a bracket that is hose-clamped to the exhaust hose. Is this bracket available as a stock part anywhere, or did you have it fabricated for BEOWULF? Thanks and best regards, Scott S

I am trying to decide on an LCD radar. I have looked at the JRC1500, the Furuno 1622 and the Raytheon SL72. What do you think is the best LCD radar choice on the market for the dollar? Thanks-Rick

Steve, I’ve been sailing over 67 years. I sail a 1973 Pearson 33. I’m on the verge of installing a Frigoboat Keel Cooler system, which, as you no doubt know, runs the refrigerant tube thru a shoe outside the hull for cooling. However, I have concerns about corrosion and marine fouling, as the shoe cannot be painted. The salesperson that I’m dealing with said (his spelling): "Sailing gurus Nigel Calder, Tom Neal, and Steve Dashew all use and endorse the keel cooler." Tom Neale is not familiar with it and I haven’t yet reached Nigel Calder. Do you have a track record with the keel cooler? Sincerely, from the Jersey Shore, George

One of my batteries won’t hold a charge too long because either something is draining off some current and/or it got over charged when I was once having alternator problems. Any ideas? How does one test gel batteries? Thanks in advance, Marvin

Good afternoon Steve and Linda…Continuing to benefit from owning and referring to your fabulous Offshore Cruising Encyclopedia…A great investment and representative of hard work on your part…I also continue to work on buying that Jeanneau 34 I mentioned to you about a month ago by e-mail, and I saw her for the first time yesterday at her new home in New Bern where she has just arrived from being in the Caribbean for most of her seven years…She is up on the hard for now, which gave me the opportunity to see her hull below the waterline…There is noticeable blistering on both sides…Close to a dozen on each side…They are all the same size…About two inches diameter and all open and faired like somebody has already been working on them….Do you consider this type of hull blistering to be a significant fly in the ointment? I can’t find it now, but I recently read an article with the point of view that hull blistering is inevitable and is really not such a big deal…that the core fiberglass remains sound…Do you share this view? Would you say these existing blisters should be filled in? Also the rudder is not on a skeg, which is probably a strike against her would you say? Thanks mucho.

Hi Steve, We have a 50′ aluminum ketch (1978 French design) here in Seattle. We’re leaving for our next trip in 18 months ( the first trip was a 5-year circumnavigation) and are trying to decide whether to pay the money now to repaint the bottom with a TBT paint at very high cost or wait until Mexico. What do you think is the best long-term plan for antifouling?

Dear Steve, Just finished your Offshore Cruising Encyclopedia. Great ideas and information. My wife and I just bought a Stevens 47 and hope to start applying your theories soon on our planned circumnavigation. Its 500 nm fuel range has me concerned though. Would you advise converting 50 gal. of its water tankage to fuel, leaving 75 gal. of water and a 20 gph genset powered watermaker? – Jim

I’ve got an electrical generating concept to bounce off you. The boat is a catamaran with two Yanmar 27 HP engines. I want to power a Marine Air 16K btu air conditioner without adding a genset (third engine, weight). I’d like to run two 120 amp alternators in parallel on each engine (one regulator per engine) by connecting their fields together. Then add a second 3KW inverter that powers only the airco compressor. A link 20 runs the 800 AH battery bank. What do you think? Thanks, Bill

Good Day: We are sailing our 48′ ketch up the Hudson into Canada this summer. We keep the boat in Elbow Cay in the Bahamas and plan to pull the masts in Albany.

I’ve seen awnings that don’t need to be supported by halyards. I’ve seen them supported with frames made with PVC pipe. Any idea who sells or might have plans for such an awning?

Do you sell or are you aware of any videos that might be of interest to us for this trip? Kindest regards, Steve

Dear Steve and Linda, I own a Columbia 50 sailboat and I am redoing the exhaust system. Do you know what the original water jacket exhaust was made of ? I have been told that copper is the best as long as no other metals are involved. I have tried a water lift but the back pressure is taking too much power from the engine (Westerbeke 107). I would like to go back to the original as I have the room to do it now. A stand pipe would work but I do not like the long section of dry stack. Any information would be helpful. p.s. great books I have “The Circumnavigators’ Handbook” and “Offshore Cruising Encyclopedia” Thanks So Much, Charles

Hello, I am wondering if you have any experience with Whispergen generators. I have read their information and they sound very good, however I have not met anyone who has one to get a first-hand story about their efficiency. Hope you can help. Brent

Do you have any recommendation on how to isolate a alternator from engine body to prevent electrolyses on metal hull?

I’m trying to track down the “super juice” eutectic solution mentioned as being used by you to improve holdover plate performance. Where should I be looking? Thank you very much! Don Joyce

I am a Marine Surveyor in Northern CA and I am in the middle of managing a large maintenance and upgrade project for a client. The client is interested in following a number of suggestions made the the “Offshore Cruising Encyclopedia”, one of which is having both an electric and manual shutdown for his diesel engine. The local Yards are saying they’ve never heard of doing this and I was wondering how to contact Steve Dashew to see if there is a drawing or write-up explaining the linkage so that we can move this process along. I have no doubt I can “engineer” the idea but was trying to avoid “re-inventing the wheel”. Can you provide me with his e-mail address or an address of someone who might have this info? Thank you, Michael

Hi. We’re about to install rigid (as opposed to flexible) solar panels on our Cal 3-46: looking at a number of options for placement: atop dodger, atop Kato davits at stern, swiveled at side rails–any comments about optimum placement and subsequent sailing/safety issues? Thanks, Glenys

Hi Steve, What kind of sailing instruments (do you recommend) for my 52′ sloop? My builder says he’s found Raymarine to be more reliable than B&G. And my electronics expert wants me to use B&G. Do you have any preference? And why? Or there is always Occam, but everybody seems to say to use B&G instead. Many thanks, Mac

We are in the process of purchasing an LRC trawler and are wondering about the advisability of including a watermaking system. We don’t know which is preferable, reverse osmosis or evaporator. Any thoughts on types, preferred brands, tradeoffs, etc? Any help would be hugely appreciated. Thanks, Tom C. and Bob S.

Can find no mention of “traction” batteries at Trojan’s web site. Do you have a part number or other identifier? Stan

Hi SetSail! Following Steve’s lead when building our 50′ catamaran, PAPILLON, we installed sea chests to supply salt water to the watermaker, refrigerator, galley sink and head (stbd side) and genset, head, and deck wash (port). While at dock in Ft. Myers Beach (Estero River) this winter, the water from the starboard side has developed an awful stench–this despite: (a) daily turnover of the water in the sea chest through the refrigeration system (Glacier Bay), (b) cleaning of the chest itself about every 3 weeks, and (c) daily flushing of the head. The water at the sink and head are the real problems, due to sulfur smell. Have you experienced this type of problem, and what can you suggest? (The port side is rarely used and has been left filled with fresh water to delay the onset of the problem.) Thanks! – Julia P

Steve, In your BEOWULF PDF, and in the Cruising Encyclopedia you mention an exhaust pyrometer. For small Diesels—30 to 60 HP, wet exhaust—what kind, brand and range of temperature, sensor and display do you recommend? At what temperature should the alarm sound? Should I fit it closest to the exhaust manifold or closest to the muffler? Thanks for your constant support, Igor

Dear Steve and Linda: Your Offshore Cruising Encyclopedia was extremely helpful to me when I was outfitting my BCC “Calliste” for extended cruising in 1998. Currently in Tin Can Bay, Qld., Australia, on hard stand, repairing a gelcoat failure and discovering other maintainance problems as well.

I have removed her two ss water tanks and was using a welder’s Ss pickling paste to remove the rust that developed around the welds on the outside of the tank. This revealed some deep pitting in some places, what looks to be a depth about half the thickness of the metal. Having trouble on deciding what to do, got any ideas to pass along ???

Have been enjoying your web site and will continue to do so, when we depart OZ. Sincerely, Douglas

Can you tell me what type of sanitation hose you like to use? We put in Shields hoses last year and now have a smell coming from the hose at the holding tank outlet. Any ideas? Dave

What would you used to clean a greasy electric motor body with so that it is clean enough to paint? CRC, acetone, ammonia, 3M adhesive cleaner??? – Phil

Hi Steve, Thinking about upgrading a boat from a 12 volt system to a 12/24 volt system to handle electric windlass, electric winches, water maker, etc while still using 12 volts for electronics and lights. In your opinion, what is the best route to go? Thank you Crawford

Where can I find more information about “pillow block bearings” that you mention in your book Offshore Cruising Encyclopedia under the section on Mega Alternators (page 870).

We have a Northern Lights 8kw genset aboard and I would like to mount a high output alternator on the unit. Presently we seldom place much of a AC load on the unit and by placing a big alternator on it we could “kill two birds with one stone”; charging our battery banks as well as providing AC needs and placing a reasonable load on the engine.

The folks at Northern Lights were not overly excited about this idea (side load on the front seal and bearings). Space constraints do not allow for an opposing “slave pulley” to offset the side load of the proposed alternator.

I noticed in your book a reference to a “pillow block bearing” which alleviates the side load problem. Any other ideas would be greatly appreciated. Fantastic reference book. Thank You, John and Deanna

I have agonized over this problem for months now. Boy, if you could give me some insight on how to resolve this dilemma I would be most appreciative. In your first Encyclopedia you made reference to the use of a high-output DC genset coupled to an inverter for the AC. Our AC load is small and quite manageable. The largest load is hot water and the reverse cycle AC (both about 10 running amps). Intermediate use items are hand tools, microwave, nicad charger, 13 in. TV. So, my selection logic to date goes something along the lines of: Weight: 3.5 kW AC genset is ~280 lbs.; Fischer/Panda DC unit or Balmar Unit 200. This thing is going in a Hans Christian Christina 40. So, space and weight are of a concern. Fuel Consumption: The DC units seem to have a logic control to throttle back the engine depending on the load. I’m not certain if the AC units are loaded up regardless of the AC load on the generator. So, if you are not running at capacity, is your fuel consumption less than full-load?. I’m guessing that the 3.5 kW AC units consume about .3 GPH. Inverter: Regardless of the genset choice, you’ll want one. Unless you want to fire up the genset to heat a sandwich or catch the 6 o’clock news. I’m looking at the Trace 25. It should handle the inductive load of the AC just fine. I am running a house bank of four, 4D AGM batteries. With their low internal resistance they will accept a high rate of replacement charge off a DC unit. So, from your experience in setting up systems, is the 12V genset a good solid technology? Does it do a good job in keeping the house banks up to 13V while running a long term AC load? Any trade-off from one to another that should sway me? Given the above usage criteria, what do you think? Do you cover this subject in more detail in the Encyclopedia second edition? All the best and thanks in advance for your time, Kevin McGreevy

Hi Steve, I need to get a hard drive for my boat, a 52′ sloop. My question is what kind of specs do I need to know that the hard drives will keep working if I get into a really pounding sea. I’d like to have 40 Gigs of storage.

This is not the kind of question I’d expect a boat builder to know about, but can you send me on to someone who might have more information about this? Many Thanks, Mac

I wonder if you have any opinion on electric propulsion? I am considering re-powering with a Solomon system. I have a 30hp Westerbeke diesel at this point. I am cruising full time with lots of hours at anchor. Comparing prices, diesel/electric, is a definite apples/oranges situation, with the result being that I may decide based on my dislike of the internal combustion engine. Certainly would appreciate your reaction to the this concept used in a cruising sailboat. Ross

Hi, I just received my video of BEOWULF in the S Pacific…my wife and I watched it twice, back to back, and were totally impressed with the video and of course BEOWULF.

My specific questions are equipment related:

How did you design the water ballast system and which manufacturer did you select for the pump(s) and other controls ? I own an older 60 ft steel ketch with three water tanks built into the hull. The port and starboard tanks could conceivably be converted to a ballast system. The third tank could then be used for drinking water supplied by a watermaker. What volume and therefore weight would you consider to be a minimum to use in such a system? obviously this is hull specific but I do not have any rules of thumb to use. My boat is 60,000 lb displacement. I noticed on the video that you showed a shot of a fuel/hour gauge which was easy to read. Would this be a practical retrofit and if so which manufacturer did you use? In one of your books, I don’t remember which I have several, you had a section on anti roll flopper stoppers? I was wondering how often did you use them and how effective are they?

I would appreciate any advice you can give as we are in the middle of a retrofit/upgrade. My wife thinks that your video is going to cost us a lot of cash, but she won’t let me make an offer to purchase BEOWULF!!! Regards, John

I am looking for a source where I can purchase some battery hydrocaps. Steve Dashew talks about them in his Offshore Cruising Encyclopedia?–Lutz

Dear Steve, We have a 60′ steel PH cutter, mast is 76′ off the water. We have had two back to back strikes, one year apart. The first strike took out the Icom VHF, the Simrad instruments and the autopilot. Just after the new electronics was installed (I literally mean 3 days), the boat took a hit at the yard in the water. The second strike took out the VHF again, and so far, the Charles Marine Isolation transformer (it was tied to dock power at the time). No other damage has been noted, and I am convinced that the strikes were well dissipated throughout the mast and hull.

Question: If I install the pom pom at the mast head, does it reduce the efficiency of the VHF antenna also on the masthead? Also, what kind of pom pom do you suggest? The electronics technician told me he could see a burn on a bolt head at the masthead where he thought the lightning bolt jumped from the antenna and ran down the mast. As a side note: both antennas were fried and literally exploded.

Thanks a million for the website, a tremendous resource.

Am refitting a Cherubini 44 ketch (engine, tank, wiring cosmetics, etc.). At this point I would very much appreciate any info or source information regarding integral fuel (diesel) tanks. I am considering placement in the keel aft of the sealed ballast section. Is there any long term deleterious effect on the hull glass? Thanks in advance for your attention and effort. Needless to say, I have read the encyclopedia, storm tactics, SetSail info, etc. Great resources. Pete

Hi Steve: I have read, with a great deal of interest, several of your publications. Being interested in yacht design, I have learnt much from them. I am interested in the water ballast system you have installed in BEOWULF. It puzzles me that these water ballast systems use only sea water. Why not use the fuel and potable water that is already on board and move that around? BEOWULF would have some 12,000 lbs of combined fuel and water if all tankage was full. Why increase displacement by bringing on board an extra (up to) 7,000 lbs of salt water? The extra displacement will increase absolute stability, but is this necessary particularly when it is at the cost of added hull resistance? There could be separate ballast tanks to carry sea water when potable water and fuel are low. I would imagine there would be a case for the use of already on board fuel and water. Would you agree? Is there a reason you don’t do this? Also, would it make sense to install ballast tanks well aft, say in the stern, so as to adjust the fore and aft trim in heavy downwind/surfing conditions to keep the bow/cutwater out off the water to mitigate broaching tendencies? Many Thanks, Henry

You talked about an oil sipper for the engine block breather. Can you tell me more about this? I found one made by Racor. We would like to put one on our universal 32 hp. Thanks, D.M.

Hi there. We are currently assisting friends to ready their vessel on which we are crewing for the passage from New Zealand to Fiji. We are installing an ICOM 710 SSB, however, as the yacht is of aluminum construction we have run into the interesting question of how to safely earth the radio. We have had a variety of suggestions made to us but would be keen for your advice. Looking forward to hearing from you. Many thanks, Jan

Do you have any experience or knowledge about using Ericson Safety Pumps for damage control? I’ve searched through your books and only found engine-mounted pumps. The Ericson is a prop shaft-mounted pump that runs dry until it contacts water. I would like to know if there are obvious downside factors to using such a system. Thanks, Frank M

I live in Alaska and have been doing a fair amount of work on refitting our 20 year old fiberglass cutter. Electrical, mechanical etc. I purchased new set of tools dedicated to the boat so it means keeping the tools on the boat.

My problem some of my tools are starting to show signs of tarnish ( early rust ) I use them quite a bit. And put them away after every project. Do you recommend something to keep them from rusting. Wd40? Thanks for attending to this “basic” question.–Mark

I have a Powersurvivor 80 II. On board I go well at 13 liters per hour. I was thinking of upgrading. Do you have any recommendations? I have a 3.5kw inverter (trace) run 230v 50hz and 24 vdc.

Steve/Linda: We have been searching in vain through the net to find a new—as opposed to a collectible—taffrail log. Does anyone still produce these devices or have they gone the way of the buggy whip? Any advice on procuring one would be appreciated. TIM & MELISSE

What do you think about glazing up the pistons with running the engine so much with no load on it (my father is an engineer with a tractor manufacturer!)? Swan says run your engine occasionally up to 3400rpm and get the soot out!! Sounds pretty scary? What do you think? Regards Phillip

I am interested in your experience with paddle wheel versus propeller-driven generators. Also in the deployment of forward-facing propellers similar to the Aquair submersible. How have they been mounted and what kick-up mechanisms have worked? Thanks for your input. I continue to enjoy the Encyclopedia.–Clint Clemens

Hi guys, I have loved reading your articles and have picked up some good tips. Information I'm after is regardinga 240v fridge-freezer on boats. I am currently building a 50ft powercat – long, light and low-powered – in Australia, and want around 250 liters of fridge and 100 liters of freeze. I have had small 12v fridg- freezer in past boats and while they were great , the bigger setup seems to be a bit cost prohibitive. This boat won't be attached to shore power and I didn't really want to have a genset on board. I have seen high output alternators, great while moving but don't really want to have to run motors just to charge batteries if on the hook for a week. I do plan on having 4 X 100 watt panels to help things allong. Can domestic refrigeration be a viable alternative or should I stay with the way expensive 12v? Any advice would be appreciated

Hi SS–Seems to me a transponder is THE way to be seen by other ships. Can these be fitted legally in the South Pacific? Are there competing manufacturers? Andrew

STEVE, DO YOU SUCK FRESH WATER THROUGH YOUR SALT WATER ENGINE INTAKE WHEN YOU LEAVE IT FOR A MONTH OR SO, OR IS THAT TIME SPAN NOT REALLY A BIG DEAL? WE MAY HAVE TO LEAVE THE BOAT IN BERMUDA AND FLY BACK TO WORK FOR A FEW WEEKS. PHIL

I’ve enjoyed reading through the FAQ’s on your web site. I saw a references to the Yachtsaver “air bag” system to prevent yachts from sinking but their website and phone numbers are no longer in service. Have they been purchased by another company or are they out of business? Are there any other companies with similar products? Thanks, Steve Gentry

Are you pleased with the frigoboat keel cooler installation on Wind Horse? If so, about what depth and width and length aluminum box did you put on the inside of the hull for a keel cooler and did you use fresh water or a glycol mixture? (I realize the box only needs 4 sides and flanged top edges to fasten the fiberglass). Fair winds, David

A backup to my previous question, this boat CSY 37 has a V drive trans. giving it’s more complicated arrangement than a strait drive, are these prone to problems?? Thanks again Jim

Have you done any articles or do you have any information available on the cleaning and greasing of winches? Our particular problem is how to remove the top of self-tailing winches so as to get access to the spindle to remove the drum assembly. Any helpful hints would be appreciated. Thank you, JP

I have an alum. yacht. Is there some kind of instrument that would tell me if electrolysis was present? In the book Offshore Cruising Encyclopedia, it made mention of silver-chloride by engelhard/systems but…I can’t seem to locate anything like that. Any help would be appreciated. Thank you, Dale Quigley

Reading your website on your new power boat and went through the refrigeration section. I had long ago figured a powerboat could be made quiet and the cost of running was less than sail. Your thoughts on hull design are spot on as far as I can reason and follow my thoughts for a long-legged sea cruising boat. BUT – on to my question – where can I get power requirements for the Danfoss Compressors?

I noticed in your video, BEOWULF: The Epic Continues that she has a fuel flow meter. I have been interested in installing a fuel flow meter on my boat (80 HP Perkins diesel) but have been discouraged because all small capacity fuel flow meters are designed for gas engines and do not have to deal with return line fuel flow. What model / brand of fuel flow meter do you use on BEOWULF and how do you have it plumbed to address the fuel flow in the return line. Thank you very much for your assistance. Downing

How do you “equalize” Gel cell batteries?——RJB

I got the Offshore Cruising Book and I really enjoy it but it didn’t say much about inverters–Any recommendations (for a) 48-foot alum.boat, 800 amp. hrs.? Thank you, Dale

Hi Linda and Steve, We are having currently 6 x 8D as the house battery, and we are about to upgrade to some more serious batteries. The new batteries will weight approx. 1600 pounds and will not fit in the old spot. The current batteries are about midship and about 1 foot in from starboard (not the best place you would think). We have space right after the engine room, right on the center of the boat. beam-wise we would move only a few feets, but length-wise we would shift a lot of weight (800 pounds) about 15 feet further aft. Now…we are talking about a 35-metric-ton 60-foot boat here, so in my opinion it should not make too much a difference, but I would be really interested in your opinion. Thank you for your help, Thomas

…with prefilters on your fuel system, how often do you then change the 2ndary screw-on fuel filter… we’ve been doing it every other oil change (every 200hrs) phil

Hi, my name is Naroa, I don’t know much about boats. I’m doing an investigation on the length of time a 115Hp motor should be going. We have a fleet of boats that coast guard a manmade lake that supplies water to the Panama Canal. We have 3 shifts a day which means that the boats have their motor running for 8 hours. I need to know what you consider the life expectancy of these boats to be? PS Your answer is VERY IMPORTANT.

I’ve currently retrofitted my Cal39 with a Link20 battery monitor, 100amp hr. alternator and the next natural progression for my DC electrical management system is to upgrade my battery system. I in the process of installing two 320 amp hr. 6 volt batteries hooked in parallel to augment my electrical system.

My question is: The size of these 6 volt batteries warrants the proper installation into a locker in my aft cabin. I’m concerned about the presence of corrosive hydrogen sulfide (?) vapors off-gassing (during charging) into a living space. Should I install a vent to ventilate the locker? The existing locker does have “secure” cover as well as a cushion over the top of the locker…Any suggestions would be greatly appreciated. Kevin S.

I am in purchase inspection of a Lancer 42 sloop, engine Perkins 85 hp. Another same model would be far away and therefore about $25,000 more expensive to get with the biggest engine of 220hp. I am aware of hull speed formula, but these boats were build with planning hull and can speed up to 12 knots, I guess. Now, how could I change the power engine, do I need another prop and shaft, to become the most powerful and faster boat under power? If change, what are such costs and makes it sense, if the goal is to have just in case a fast boat? Thanks for your opinion, have a great day, Ute

I have a catamaran and the water tanks are about 6′ long with several baffles to limit surging. There is only one access hatch on each tank at the aft end. There is now quite a lot of white scummy film lightly sticking to the sides and bottom. Although we don’t drink the tank water and only use it for washing, is there any way to (chemically) clean the tanks as I can’t physically reach most of the tanks surfaces to scrub them–recommendations on chemicals? The boat is based in Turkey.

Hi Steve: Batteries and their maintenance are always an issue on our boat (Grand banks 46 Trawler), so I was very interested in that equalization process you wrote about lately. My simple question is: How do I get this done? I have one of these new IUoU Chargers that does everything automatic–so how can I charge my batteries up to the 15 V you mention when the charger stops charging at 14 something volts and then just delivers a trickle of current to even out the self-discharge of the battery? We have 2 engine batteries 12V/200Ah and one service battery bank of 6 x 2V/650Ah Christian M. from Switzerland

Hi Steve, Once again here I am at your information trough. Well, INTERLUDE is on the dry getting bottom job so I am going to address the long-overdue absence of some form of lightning protection. Here on the Mississippi Gulf coast, lightning damage is a very real threat, as my dock neighbor got a firsthand appreciation of the awesome damage a strike can inflict–all electronics shot, and a total of 72 exit points in the hull, 4 of which where about 1/4″ in diameter–2 below the waterline. Flooding was kept in check because the 2 major exit points occurred in integrated water tanks

INTERLUDE, a Hans Christian, Christina 40, has a deck stepped rig with all metal components except chainplates bonded together with #8 cable. Why they omitted the chain plates is beyond me, but I intend to address that in this project.

What I am proposing to do is construct a submersed ground plate, 5″ by 72″ of 3/16 or 1/4″ copper, connected thru the hull with silicon bronze 1/4″ or 5/16″ carriage bolt connectors and marine sealant every 8″ or so (overkill?). This satisfies the ISO ground plate standard of 2.5 sq. feet. The reasoning behind the plate dimension is that studies have shown that the edge surface of the conductor plays a very important part in strike dissipation. So, in an attempt to improve on the ISO standard, I have increased the exposed linear edge rather than just going with a square plate. To this plate via the carriage bolts, I will connect #4 cable to the compression post and #6 to the chain plates.

Now comes the problem of the mast to compression post connector. The aluminum mast sits on a stainless deck base which is through-bolted to the bronze compression post. Intuition tells me not to rely on this mechanical connection but weld a lug to the mast and again connect one of the stainless through-bolts to the mast with #4 cable which should insure a good low-resistance electrical path. At the masthead will be a rod sticking 6″ above the VHF antenna and for good measure, one of those bottle-brush dissipaters. OK, now I have that immersed chunk of copper. Will I be inviting cathodic problems if I include these components in the bonding system or should I isolate the lightning protection components (mast, stays, chainplates, compression post and ground plate) from the bonding system and let them reach their own electrical potential? What do you think of the solution? Thanks, so much. All the best to you, Linda and the family, Kevin, Bay St. Louis, MS.