Marlow Marine Sales, Inc.

4204 13th Street Court West, Palmetto, Florida 34221
Ph. 941-729-3370  •  FAX 941-729-4955  •  1-800-362-2657
e-mail  sales@marlowmarine.com

ANCHORING TECHNIQUES

The elements of anchoring include the anchor, rode, method of attaching the rode to the ship, charts, and the depth of the water.  Charts are the most important element for good anchoring.  They display the location of potential dangers, and the effects of weather and tide in the anchorage.  The depth of the water should be determined at high tide for calculating scope, which is the ratio of length of rode to the depth measured from the highest point (usually the anchor roller or bow chock) to the seabed.  On the Marlow Explorer, the anchor roller is 10 feet above the water line and adds to the depth of the water. The Rode is rope, chain, or a combination thereof used to connect the anchor to the vessel. 

                                                SCOPE HOLDING POWER 

                                                            10: 1    100%

                                                              7: 1      91%

                                                              6: 1      85%

                                                              5: 1      77%

                                                              4: 1      67%

                                                              3: 1      53%

                                                              2: 1      35%

Remember that if you are using a chain rode the holding power is much greater; therefore for normal weather and current conditions, a scope of 5:1 is acceptable. When using a chain rode it is recommended that you employ the use of a nylon bridal to reduce strain on the cleats and anchor windlass.

While trying to select an anchorage there are four questions for you to answer.  Is the anchorage protected? Does the seabed provide good holding ground? What are the depth, tidal range and current in the anchorage?  Is there sufficient room? Basic anchoring consists of determining the location, dropping the anchor, laying out the scope, setting the hook and assessing where the vessel ends up.  When you have selected where you are going to anchor, idle forward into the wind and/or current to your selected drop anchor position.  As you start to lower your anchor have the vessel ghosting aft downwind and/or current while the anchor and rode are paying out. Remember to lay out the rode on the bottom, do not drop the anchor and rode in a pile.  When you have reached the selected scope of the rode set the anchor with a slight backing of the yacht.  As the anchor digs in and resists the backward force, set the anchor with a small amount of reverse thrust to achieve a thorough set.  With the anchor set in your selected location, check to make sure that the boat is not dragging the anchor.  Look around to see that your vessel will not be in the channel, that all surrounding anchored boat s will not swing into you, and that you will not swing into other boats.  To make sure your boat is not dragging anchor, line up two objects on land and after 30 minutes check the alignment

Leaving your Boat for Awhile? Try this….

When you leave your boat, many of you put baking soda in the refrigerator to eliminate the stale smell. You can do the same in the vanity cabinets of the heads and it really helps keep them fresh. Another tip is to pour white vinegar in a shallow pan about 1” deep, before leaving the boat. You can place this in the sink if you want to so if a passing wake is too big, spillage will be harmless. A pan of it in the head compartments works great too. While you are gone the vinegar absorbs unpleasant odors and freshens the interior of the boat for you. While you are doing this, put a single sheet of fabric softener towel in the toilet vanities, under the berths, and settees. When you come back you will be pleasantly surprised by the nice clean aroma of the boat. Of course if the toilet hoses are old, and leaking gasses or liquids, not much will help. You should have the toilet system hoses changed every three years, and the various components like vented loops serviced to be sure they are functioning correctly.
 

Tips for Teak Decks…..

First, revise your thinking about your decks. Most owners treat the care as something to be avoided, and put off until they are a mess. For routine maintenance, when you are washing the exterior of the boat, don’t forget to wash the decks. By that we mean, take the leftover soap and water, and the mop, or whatever device you use to wash the rest of the boat, and add a little more soap. Scrub the decks down with the mop or whatever you use, every time you wash the boat exterior. After all, the decks receive more dirt, and debris than all the rest of the boat from dirty shoes, acid rain, jet fuel, dirty air, runoff, etc. They will stay nice looking a lot longer with no special care if you just wash them each time.

Now, when you want to really spiff them up, do the following. (I assume by now all of you have heeded our warnings to throw away your stiff bristled deck brush and get a 3M doodle pad at your favorite marine store. If you have not, do it now because you are ruining the decks with a stiff brush.)

Go to a good grocery store and buy a box of Spic and Span powdered soap. Get a gallon of bleach, and a quart of white vinegar while there.
Mix the ingredients 1 part Spic and Span, with 2 parts bleach, and 4 parts water.
Mix them in a bucket, with hot water for even better results.
Mist water on the decks. Don’t soak them, as this will dilute the mixture.
Use the Doodle Pad to spread the mixture around the deck, and allow to sit for a few minutes, being sure to coat everything. Try to do an area roughly 2’X 6’ at a time.  After about five minutes, dip the Doodle pad in the mixture and scrub the deck with vigorous strokes, in a fore and aft direction.
Let stand for about 3-5 minutes, depending upon the temperature of the day, and rinse thoroughly. If any areas dried out during this period, scrub them lightly with the Doodle pad. What are you going to do with the vinegar? Lots! It is a great window cleaner, and can be used with the Spic and Span for a “Turbo” deck cleaner in between times you scrub with Bleach. Just substitute the vinegar for the bleach portions.
 

A lot of the yachts we are selling and servicing are being fitted out with the new drip less shaft seals. Considering the number of them showing up in yachts we thought it was time to discuss them again and the care of them with a bit more detail.

There are a number of types and theories about the best style of seal available. The type known as a “face seal” seems to be gathering favor with most manufacturers and consumers.

The face seal, as it is called, is where two perfectly machined faces are held against one another by some sort of spring tension. The spring tension and the mating of the faces is what keeps the water out of your yacht. It is somewhat amazing when you consider that we go to great lengths using double hose clamps, gaskets and all sorts of devices to keep a part from leaking on board and here is a simple device of two flat faces contacting each other, so finely machined that water does not pass. To seal the place where the shaft passes through the machined stainless collar a pair of neoprene o-rings guard against drips.

For descriptive purposes we will use the PSS drip less seal as the model. There are several variations on this so carefully read your manual if yours is another brand. If you get confused drop me a note and describe the unit. As soon as I can find the time to respond I will send you a reply on maintenance.

The PSS assembly consists of a rubber bellows about 8-9” long which has a smooth section on each end to receive a double hose clamp. Look closely and you will see that there is a seam where the bellows was manufactured. This seam should be horizontal, never on top. The reason is that most flexing in the drive train occurs in an up and down motion and if the seam is vertical this will place the seam in its least flexible position.

There will be a stainless steel collar, or ring, around the propeller shaft. This collar is held in place by two Allen screws. There should be a total of four Allen screws in the collar. Two of them actually contact the shaft and the other two are screwed in behind the forts to lock them in place. So, each threaded hole has two. One to secure the ring on the shaft and one to lock that one in place.

Inside the machined stainless collar, invisible to you except when it is removed is a pair of o-rings. Always remember that an o-ring is very tender and so much as a nick on it will cause it to lose its ability to seal.
Just behind the stainless steel collar is a black, carbon disc, which is held in place by hose clamps, inside the front end of the bellows. Note that there is a nylon water hose fitting going into the carbon disc. This fitting should be projecting horizontal and the supply hose going to it should be supported as closely as possible to the hose barb fitting on the carbon disc. Normally it can be held in place by a tie wrap fastened to the inside of one of the engine stringers. This will keep it from vibrating around and coming loose. Ideally this hose, which supplies cooling water to the shaft alley should be of clear, reinforced nylon hose so you can see if it is dirty or clogged up. If it clogs up the bearings, which are contained in the shaft alley, will suffer.

The way this affair works is the bellows length is adjusted so that it acts like a big spring and applies tension on the carbon disc where it rides against the rotating stainless steel disc secured to the shaft. If you have too much tension it will cause premature wear in the carbon and stainless steel faces. If you have too little it will not seal properly. The way you adjust it is simple.

Use an Allen wrench and loosen the outer locking screw in the stainless disc. Remove it and put it somewhere safe. (Maybe a plastic baggie). Then loosen the Allen screw further down in the threaded hole. Put it with the other one for safekeeping. Rotate the shaft about 90 degrees and you will see the second set of Allen screws. Remove them just like the previous ones.
Get some Dawn, Joy or other dishwashing liquid soap and coat the shaft just forward of the stainless disc. Try to force a little soap down in the area of the forward end of the disc where the shaft exits it. That will lubricate the shaft soothe O-ring will not be damaged when we move the disc. DO NOT USE ANY LUBRICANTS like WD 40 or any petroleum products, as it will damage the carbon disc. Use only liquid detergent to lubricate or clean any part of the seal assembly.
Slide the stainless disc forward on the shaft a short distance until you can see clearance between it and the carbon disc behind it. Sometimes it makes it easier to slide it and twist it at the same time.
Take some of the soap and water and clean the two contacting faces. If you have a white 3.M scrubby pad (very fine) you can use it to clean any accumulated debris from the faces so they mate smoothly. If the faces are pitted you may soon need a new pair of discs but they work surprisingly well even when damaged a little.
Measure the length of the bellows assembly, end to end. Note the measurement.
Put an Allen screw back in each threaded hole, but do not tighten them.
Slide the stainless disc aft, compressing the bellows, until the measurement of the bellows is exactly one inch less than your previous measurement when it was in a “relaxed” position. This one-inch of compression is what will give the correct tension on the carbon and stainless discs so they seal properly.
While holding the stainless disc in that location to maintain one-inch compression, tighten one of the Allen screws down. DO IT SLOWLY! As soon as you feel it touch the shaft, stop! Now turn the shaft and do the same with the other Allen screw. Just run it in until it just touches the shaft. If you run it in too hard you will cause the disc to twist slightly and it will not run true on the shaft. It will appear to wobble as the shaft turns and will wear prematurely.
Once the two Allen screws are in equal contact with the shaft, go back to the first one and tighten it securely. Repeat it for the second one and then run the locking Allen screws in behind those to hold them in place.
After running the boat, if you see a fine mist coming from the seal area, the adjustment is to increase the bellows tension by reducing the compressed length by 1/8” increments. In other words, if after adjustment the bellow length is 7.5” and you have a slight misting or drip, compress the bellows length to 7.375” to place more tension against the sealing faces.

That’s it! You now have a properly adjusted drip less shaft seal and unless the O-rings are damaged they perform very well.
 

On Deck:

A few simple tips follow that are quite amazing in their ability to clean, freshen and maintain. Tips from your own larder are always welcome for trial and if we use them we will certainly credit the provider.

Stubborn rust stains on fiberglass often do not require exotic acids to remove them. Take a can of Coca Cola (preferably leaded, real Coke) and wipe it with a Turkish washcloth or similar. If it is really stubborn, add a bit of table salt to the mixture. Perhaps a tablespoon or two for a can of Coke to provide a bit of abrasive and tune the Cola up.

If your stainless steel is really dull, a quick fix is to clean it well with fresh water, then make a mixture of 50 percent alcohol and 50% ordinary white kerosene. Wipe off after a half hour or so. It will really look nice and resist corrosion better.

If your boat has any chrome plated fittings (most do) use white vinegar to clean it. It is harmless to the plating. Another miracle cleaner for chrome is ammonia on a dampened rag. Neither will leave streaks. You should wax chrome after cleaning to \protect the surface.

If you have brass cabin fixtures you can buy the high priced spread to clean and polish them or you can go to the galley. Take out white vinegar (what do you mean you don’t have one of the finest freshener-cleaners that exists on hand?), and table salt. Mix them one tablespoon of salt to one cup of vinegar. Impressive cleaner! Harmless to the environment.


Window washing is made easy and they will shine like you have never seen before if you will first wash them with a cup of white vinegar, a cup of ammonia and two tablespoons of corn starch well mixed with five gallons of warm water. After the glass has dried, take a common blackboard eraser that you should buy at an office supply store and wipe the windows. Wow, do they look good!


If you have windows with brown spots on them, use full strength hydrogen peroxide. Magic!

To remove paint drips from windows, scrape as much off as possible with a plastic knife. Follow up by making a poultice of hot vinegar and baking soda paste applied to the paint specks. If the paint is old and dried, add a bit of nail polish remover to the poultice and cover it with a piece of tape so it does not evaporate so fast. Remove after 30 minutes and scrape, clean with vinegar, ammonia and corn starch.

Want a miracle moisture absorber? Buy a box of chalk and put it in your hanging locker or wherever needed.

Paint smells can be eliminated by putting a large onion, cut in half and placed in a pan of cold water when you leave the boat (or house).

If the whole boat smells like your boyfriend’s gym shorts, buy a small bottle of wintergreen from the drug store. Take a few small cotton balls and put a few drops in them. Place them all around the boat. Mouthwash for boats.

For smelly bilges, a plastic shoe box with lots of holes punched in the top then filled with charcoal briquettes will absorb odor very well. Make it a habit to change them about every 90 days.

Is the inside of your microwave a disaster from exploded potatoes and other delicacies? Here’s a good one. Put several slices of lemon in a dish with water. You can heat it until it is steaming by using the microwave alone or start with hot water from the tap and then zap it in the microwave. You want lots of steam in the microwave from the liquid. Let it sit for a while until cool, remove the lemony fresh water and wipe the interior down with a good quality paper towel. Nice!

If you have eater spots on anything get out the white vinegar again. Wipe it down, dry, do it again, leaving it a bit damp this time for about ten minutes. Wipe it clean and polish with the eraser you bought. Goot!

If you have rusty drains or spots on the stainless sink, use a cut lemon on it then wipe with a paper towel until dry.

Your boat will be worth more when we trade it on a new Marlow if it is bright, shiny and clean, smelling fresh as a daisy.
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Think Zincs

Before you read on, think about the last time you checked your zincs.  Was it more than eight or ten months ago?  Did you check them all?

Many boaters are not clear about why zincs are needed or how they work.  Usually when a boat is hauled for general maintenance the yard will ask to replace your zincs.  We recommend replacing zincs whenever your boat is hauled because by that time, they are usually used up, and no longer giving good protection. A zinc should be replaced when it has sacrificed about 50% of its original mass. Webster defines zinc as a bluish-white metallic element, usually formed in combination with other metals, often used as a protective coating for iron.  The purpose of the zinc anode is to save a vessel’s more precious metal parts that come in contact with salt water.   This means we would sacrifice the less expensive metal in order to protect other metals like bronze and inferior stainless that is more likely to corrode in a hostile environment like salt water. 

To understand the action taking place under your boat in the water, we know that more precious metals are considered electrically positive, “cheaper” metals are electrically negative, and electrons flow from negative to positive.   Under your boat electrons are flowing from the zinc into the bronze and into the salt-water electrolyte.  Because zinc is more negative than bronze, it gives up its charges first.   This depletes or erodes the zinc and allows the bronze to remain intact.  Without this sacrifice, the bronze would lose its negative electrons and over time weaken until that forgotten through-hull eroded away. 

To make matters worse, moving a boat from cold waters to warmer waters can increase the rate of erosion, making it necessary to add more zincs or to replace them more often.  The higher salinity of the Caribbean waters can also hasten the erosion process.

To ensure effective protection, all the metal through-hulls should be connected together with a bonding wire or strip that leads to a common spot such as the engine, assuming the boat’s engine has a metal-to-metal connection to the prop shaft.  In most cases the best choice to mount a zinc is the prop shaft.  Further, any underwater metal parts such as rudders, trim tabs or bow or stern thrusters that can’t be connected to the bonding wire should also be protected by a zinc on each assembly.   To be fully effective, all paint and corrosion must be removed between the metal to be protected and the bonding wire.  Where the zincs are attached to the shaft and rudders, the metal should be clean and shiny, with no residual paint hindering the contact.  Needless to say, zincs should never be painted.  This will only make the zinc ineffective, which would force the negative charges to find another place to leave and cause loss of material at that spot.

So what can you do?  Zincs are like a part of their own little electrical system inside your vessel and are subject to all the rules of electrical wiring, including insulation and “short” protection, and they too need frequent inspection.   

¨          Make sure all the bonding connections inside the hull are secure and free of corrosion. 

¨          Check that the bonding wire is not in contact with bilge water.

¨          Make sure the contact point where the zinc is installed on an underwater assembly is clean and bright, and not insulated by bottom paint.

¨          If your engine is raw-water cooled, check for a separate zinc anode(s) installed in the block.

¨          There is also a zinc or two on your generator.  Check for corrosion and replace if needed.  If you can’t locate a zinc on your generator, the zinc has probably eroded away and you should refer to your owner’s manual for the correct placement.

¨          If you have a bow or stern thruster, they also have zincs that need to be checked and replaced as needed.

Remember that any stray DC current inside your boat can and will accelerate the loss of zinc into the salt water.   Also, as a zinc anode wears away, its surface becomes smaller, which accelerates the loss of material required to maintain the same level of protection. If your vessel lives year round in the warm Florida waters, rule of thumb would be to check all the zincs every twelve to fourteen months.   If you’re finding replacement is needed more often, you may want to add zincs for longer life.  

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Helpful Hints and Tips
 

1.      Lubricate canvas zippers with a wax candle. It makes them slide nicely and will not attract dirt and stain like ordinary lubricants will.

2.      For those zippers that won’t stay closed, spray them with a lacquer based hair spray. Let them dry and they will work like new.

3.      Spray a small mist of vegetable type kitchen oil on snaps. They will snap, unsnap with ease. If you use a q-tip, Vaseline works well as a lubricant and corrosion proofing though it tends to attract dirt.

4.      If you have a nick appear in a windshield or window, (boat or cars) apply a small drop of clear nail polish as soon as you see it. It will fill the nick and stop further cracking. Truly miraculous!

5.      To clean your windows inexpensively but so they sparkle, use windshield washer fluid and old newspapers. It really polishes them. If you want them to stay really clean and repel dirt-water, use Rain-X. This stuff really works. Ask Andy Rooney. He caught all kinds of flack from legions of customers for denigrating it on 60 minutes. After trying it he became a soldier for them.

6.      Store deck cushions standing on edge, zipper down. This will allow them to dry. When you order your new Marlow Explorer from us we will install Nimbus closed cell foam as standard. It does not absorb water.

7.      To remove a light layer of hull oxidation without removing good gel coat, put 5 tablespoons of vinegar in a gallon of water. Sponge it down and rinse well before it dries. If you don’t have white vinegar on board, shame on you. You are probably hooked on Miracle cures (sold on late night TV) that don’t work, wreck other things they touch, and burn your eyes, hands, ears and noses. White vinegar is a great cleaner, deodorizer.

8.      When you clean the refrigerator, the final wipe should be done with white vinegar. Don’t wipe it off though. Leave it on and it will do a great job of deodorizing.

9.      To remove creosote, tar, oil, etc. from your boat, spray a little oven cleaner on the spot. Let it sit for 5-20 minutes depending upon the thickness of the mung on your boat. Rinse off and repeat as required.

10.  Get yourself a fake chamois. Buy the one that comes packed in a plastic cylinder. Don’t lose the cylinder and always store it damp with the cap on. I have one over 20 years old that although a bit worn, works great. These manmade products will outlast and vastly outperform any natural chamois ever sold. Each time you dry the boat, it is like polishing it with the finest grit you could imagine. Over the years it will literally polish paint, gelcoat to a smooth finish. Buy the thickest one you can find in your favorite marine store. Save the Chamois!

11.  If your engines are using a bit more oil than they used to, consider the new Synthetics such as Mobil One. I have switched all my collection of autos and trucks over to this product and it is remarkable to me. Engines that used a quart of oil at 12-1500 miles now go twice that before a quart is gone. Cold starting is quieter and it stays cleaner looking longer. Though it is more expensive the extended oil change intervals it affords reduces the cost to tolerable.

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Fuel Tank Maintenance

For the GB, Eastbay and OA owners we want to remind you to inspect and clean the tops of the fuel tanks on board your yacht before another hot summer contributes its corrosive effect to the metal.

If the tanks are alloy (aluminum) take no pleasure, assume no immunity from the ravages of salt water, especially hot salt water, as we know it here in the South. We have replaced the alloy tanks in an East Bay in less than three years after delivery due to salt water lying on the top and sloshing on the bottom in the bilge area.

First, go and buy a product called Ospho if available in your area. Most paint supply stores, Lowes or Home Depot carry it. If you can’t find it, go to a good marine hardware store and purchase a quart of Star Brite rust killer. It usually comes in a spray bottle, which will make the upcoming job much easier, especially when you adjust the nozzle to make a combination of mist and stream. If you find Ospho, buy a one quart spray bottle to dispense it.

Buy either three aerosol cans of Corrosion Block in the 16 oz size or a product called Corrosion X in similar size. If you can buy either in pure liquid form, do it and buy another empty spray bottle to dispense it. If the latter, you will get a lot more bangs for the buck compared to the aerosol, as much of the aerosol can is propellant.

Unplug the yacht from the shore power and/or shut down the generator just in case some clown has left an exposed AC terminal or wire end loose in the bilge.

Take a hose into the bilge with you and use a nozzle that allows a mixture of fine spray and high pressure, as adjusted. For a normal GB of any style, place the nozzle on the top of the tanks and blast away. If you have not done this before be prepared for a deluge of building debris that will wash off the tank tops. This step is really important because even if the tanks show no salt water lying on them, there will be dust that will absorb and negate the effectiveness of a product we will use later. It’s a really good time to spruce up the cleanliness of your pride and joy so rinse every nook and cranny. If you are feeling heroic, use soap and water. Dawn or Joy work great.

When you are sure you have absolutely flooded the tops and sides of the tanks with fresh water, move outboard so you can thoroughly wash the debris that will lodge alongside the outboard areas, between the tanks and the hull sides. Don’t be bashful about the volume of water, as you could not cause a problem if you held it on for an hour at full tilt pressure. Try not to directly spray electrical components but if some spray does find its way onto them, simply take your shop vac and reverse the hose, using it as an efficient and high volume blower to dry the area.

When you have gotten the areas well rinsed, take a plastic bag and gather all the debris that will have worked its way down. You will probably find an old set of pliers, a screwdriver, an assortment of screws, wire ends and maybe even a long lost love letter. One 42 wood GB yielded a quart of Makers Mark whiskey to me, probably squirreled away for a lay day due to foul weather from the Sky Boss or Wife Boss. Make sure the areas around the bilge pumps are completely free of trash or Murphy will pay you a visit.

Start the main engines and let the heat from them thoroughly dry the engine room and bilges.

When all is dry put on an old long sleeved shirt and pants, with shoes and socks. Get a pair of rubber gloves and a painter’s mask. Don’t use a paper throwaway, unless specified for painting, as they do not offer enough protection. Wear a painter’s hat or a baseball cap and glasses in case you are a klutz.

Turn on the engine room blowers for ventilation.

Start at the outboard sides of the fuel tanks and spray the rear and tops with a heavy coating of the chosen product. Once again, don’t be bashful! Coat it fully, as this product is going to stop Mr. Rust dead in his tracks.

Let the chosen product sit overnight and repeat the rinse cycle described above exactly.

When the engine room is nice and dry, turn on the blowers and go below once again. Start outboard near the hull side, as close to the tanks as you can manage. Spray the bejesus (old Southern saying meaning "do it to it with gusto") on the back sides, top and fronts of the tanks. Fog the heck out of the tops so a good coating is on every square inch.

While you are out there, spray the steering wires and sheaves of the steering system, wiping them with a heavy hand wash cloth or similar to coat them thoroughly. Your steering system and autopilot will thank you silently with improved performance and longevity.

Pay special attention to the areas where the tank rests against any support or obstruction, as this is a place for chafe and is probably laden with salt crystals.

Now go back upstairs and take the boat for a spin of an hour or so to allow engine room heat to reduce viscosity and spread the anti corrosive mix.

If done as directed the life of the tanks (assuming you have not descended below critical mass thickness) will be greatly enhanced.

For the alloy water tanks in the lazarette, or for any alloy fuel tanks that may have found their way aboard, do not use Ospho or Starbrite to remove corrosion. Rinse the bejesus (that word again) out of them, allow to dry and coat them as described.

On the subject of tanks, we are developing a mold so that we can replace those metal tanks with Vinylester resin frp tanks in lieu of welded steel or (Yuk) alloy. We think that by utilizing our Marlow Explorers as mini freighters and investing in a set of molds we can reduce the cost to near that of steel or alloy. At the same time we can increase the usable fuel supply by roughly 10% by molding to the shape of the hull rather than a square box. This will also provide a sump to collect all the debris that finds its way into the tanks.

Our service yard is always jammed with work but we will find a way to replace them if you prefer that we do the work. We can do it better than anyone because we have done more of them than anyone and we care about our work product. We would not sell our frp tanks to another yard for installation for any number of reasons related to quality of install and ability.

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Stainless Fasteners

Most yacht manufacturers select stainless steel for applications where there may be an opportunity for excessive corrosion on fittings and fasteners on board. It is in the selection of these fasteners that choices are made as to the alloy that will directly affect the longevity of the part selected. The wrong choice can cause a domino affect if a crucial fastener or part fails, causing damage far beyond the part itself. To shed a bit of light on the subject, let’s dig into it a bit.

"18-3-300" has been considered the norm for most marine applications. In recent years a more corrosion resistant variant has become more popular though its cost prevents some from using it. This newer alloy is called 316 and it is considered to be top of the line for exterior exposed applications. Wherever high exposure to elements that cause corrosion is expected, premium manufacturers select 316. In our own Marlow Explorer Yachts we use 316L, which is considered the best one can buy. The "L" stands for Low Carbon.

In selecting stainless fasteners and hardware, price is a consideration. Speaking broadly, 18-8 type fasteners are readily available and considerably less expensive than 316 alloys. Though 316 and especially 316L are much more expensive today than the 18-8 family, as the market increases for these fasteners the price should come down a bit.

There is a good bit of wrong information regarding stainless steel circulating around the marketplace. One common misconception is that all stainless steel is non magnetic. This is not factual, as a very sensitive magnet will often show a slight attraction for many stainless steel alloys, with the lower grades being more magnetic normally. A washer for example of 304 will often show an attraction for a magnet and a 302 allow will nearly always have an attraction. Often times the two alloys are mixed in the cold working process and a bit of 302 is mixed with the 304. When this happens it will attract a magnet and will not be as corrosion resistant.

When we purchase a stainless steel part many boaters expect it to be completely free of rust or corrosion. It is not. Even the very best alloys will show rust or corrosion in the right conditions. Think about the word "Stainless". It means stains less than other metals like iron. It does not mean stain proof.

There are two conditions often confused regarding stainless. One is rust and the other is bleeding. They are very different.

Rusting is the actual breakdown of the metal part due to a prolonged or intense exposure to a corrosive atmosphere. Where actual rust appears we are seeing the physical deterioration of the metal.

Bleeding on the other hand occurs when a fastener is dirty or has other corrosive materials on its exterior. Yes, dirt is a corrosive influence on stainless steel. The dirt reacts to the corrosive atmosphere and breaks down, with the result being discoloration of the fastener and surrounding area. This appears similar to rusting since the color of rusting and bleeding are the same. The difference is that the metal is not corroding slowly away when bleeding occurs.

To combat bleeding, stainless must be kept clean, due to the fact that stainless requires oxygen to produce and maintain the protective coating of chromium oxide, which stainless produces in an oxygen rich environment. Many times we see bleeding coming from under a fastener that is perfectly bedded. This oxygen free environment is ripe for bleeding, as the stainless cannot produce the Chromium oxide that protects it in an oxygen free environment.

This problem can be helped by "passivation" of the part. This is often done by electro polishing the parts by dipping them in an electrically charged liquid that cleans the surface impurities from the part. If followed by hand buffing the part will produce a lustrous surface, which will resist rust and bleeding very well.

Although there are many choices available in stainless parts, you really want alloys in the 300 family. Many people refer to these as the 18-8 family, which just refers to the basic configuration of the formula being 18% chromium and 8% nickel.

The most common classifications for the 300 series are:

302, which is commonly used in the cold heading of screws

303, which has a much higher percentage of sulphur. This type is particularly well suited for machining. When a bolt is produced in stainless, it is often times machined from 303 alloy, whereas most screws heads are made by cold forming them and 302 is often used.

304, which is typically used in the manufacture of high quality machine screws, bolts, etc.

305, which is often used for deck fasteners, for example under the teak plugs.

316, which has Molybdenum added and provides a much greater resistance to corrosion.

316L, which is a more highly refined stainless showing less carbon steel. It is very corrosion resistant.

When the duty for stainless goes beyond the normal ability of these alloys to perform reliably, some manufacturer "hot chrome" plate the stainless for additional corrosion resistance. It has not been conclusively proven that this plating does much for the stainless except make it shinier. It is our opinion that if even higher performance is required there are other alloys that increase the nickel content and improve corrosion resistance, albeit at high cost. Some examples of this are Alloy 20, 630, Hastelloy and an old, expensive favorite, Monel.

Specific alloys will produce specific results that can be tailored for the job at hand. Aquamet 22 for example is a wonderful, though very expensive shafting material. Highly corrosion resistant yet incredibly strong, it is ideal for today’s high torque engines turning large propellers.

There are many factors in selecting the alloy we require for a specific job. Generally speaking, as the corrosion resistance increases, ultimate strength decreases. Manufacturers have learned many tricks of the trade to overcome this to some extent by alloying certain materials, which produces an even stronger product by the inclusion of various trace metals.

The best tip we can give for keeping stainless steel looking good is to keep it spotlessly clean with a good paste protectant to help seal out the pollution, acid, etc. which rain from our skies. In areas near the exhaust system for diesel powered boats we will have to be especially diligent, as the burning of diesel with sulphur produces a form of sulphuric acid when combined with salt air. All fuel contains sulphur and the combination is vexing to the skipper who likes nice and clean metal. Once again, keeping it cleaned and a couple of coats of a protectant sealer will go a long way to reducing your cleanup and maintenance.

Just keep in mind that they mean "Stain Less" not stain free.

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From the Environment

This article brings a small tip that can save literally tons of pollutants from entering the waterways of the USA.

We note that most yachts these days are being painted with an ablative or comparatively soft bottom paint that rubs off or wears away, theoretically exposing fresh biocide to the hungry critters looking to attach to MOMS MINK.

In theory this works quite well but in practice not nearly as well as the laboratory. In theory the water rushing alongside and under the yacht will wash the bottom of the yacht at all times, therefore wearing away (ablating) the paint and exposing the fresh poison. But hydrodynamic law gets involved and the laboratory theory proves to be hit and miss.

Simply explained, every body moving through a fluid (air, water, oil or any other fluid has what is described as a boundary layer. Depending upon the shape of the object, this boundary layer may be paper thin or as much as ½" thick. This layer’s thickness will vary with speed. Within this boundary layer, virtually no flow is established other than erratic or incidental flow. It is in fact a dead zone, where the fluid surrounding the object (your boat hull) is carried along with the yacht for the most part. This hitchhiker actually adds to the load on your engines to carry it, since it has mass and therefore weight.

The reason that in some areas the ablative action seems to work so well is simply turbulent water generated by protrusions or changes of shape in the yacht’s hull. In other areas, no scrubbing or ablative effect is seen. That is why ordinary, easily removed scum can adhere to the bottom after a 1000 mile voyage, except in the areas where turbulence washes it free. Factually, except on extremely fair surfaces, very little ablative action takes place except where turbulence is generated.

Since many of our customers and friends seem to employ divers to come to the yacht and occasionally scrub the bottom with brushes or a towel, why use ablative paint at all?

The answer is marketing driven primarily. A good story has been generated about what could but does not occur to any great degree and most boat owners seem to employ an occasional diver, why not switch to a non ablative paint and stop scrubbing off layers and layers of paint. After all, the objective is to remove the scum that allows the barnacles to attach and become immune to the poison underneath. By the time they spread their glue on the poison, it has provided them with a fine insulator and they are home free, ready for a ride.

A non ablative paint may be substituted with a greater concentration of biocide and with routine washing using a soft brush or towel; a clean biocide is exposed without leaching the thousands of tons of pollutants into the oceans.

Give it a try the next time MOMS is due for a bottom job. The colors can be brighter, the paint harder and smoother and the oceans a little bit cleaner.

What a great thought.

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This article is an update of one done about five years ago regarding anchors, chain and anchoring out. In reviewing it, the details seemed as germane now as then so with a bit of revisions and updating we present it in the hope that you will take the advice in the last paragraph and spend a few nights on the hook. If you find a special place, please share it with us so our other members may enjoy it as well.

There are a lot of chains available but most of us need only to concern ourselves with just three. High Test, Proof Coil and BBB.

Each of these chains has a specific characteristic that differs from the others. Proof Coil has the longest link, with High Test in the middle and BBB the shortest. Chain is given a size based on the nominal diameter of the link that makes up the chain. We usually use chains sized from ¼" to 5/8" though we occasionally see larger. The most popular sizes are 3/8-1/2".

Chain measurements are important when considering the whole package. Not only must the chain be of sufficient strength, it must also fit the wildcat on the windlass it will be used on. The length of the chain link refers to the distance between the extreme ends of each link and the pitch refers to the distance between the end of one link to the end of the next link in the chain. In other words a pair of links.

For short link chains of the type we have mentioned above, the length is roughly five times the materials diameter and the pitch is roughly six times the material diameter. The word "roughly" is accurate because the small differences in pitch between the various sizes will insure that a BBB chain will not work properly on a 3/8" proof coil gypsy or vice versa. The matching of the chain and the gypsy are obviously very important. Tolerances adhered to by the chain manufacturers must also be considered since not all companies have close tolerances. Fortunately most European and US chain companies do.

The chain is made by the manufacturer by cutting off successive lengths and the bending and passing the wire through the preceding link to form the chain. Normally automatic welding machines fuse the ends to create a strong and smooth link. In many chain companies this process is not automated and a given chain will have many variations in it’s links. This will cause you windlass trouble in retrieving or paying out chain. In some cases the tolerances are outside the normal range and the manufacturer will actually stretch short lengths of chain in an attempt to get it to conform to a standard size. The success of this is hit and miss.

In commercial applications many insurance companies will require a certificate of test from the chain supplier before they will allow its use on an insured vessel. Reputable chain manufacturers will supply this test data.

Since most chain is steel, it will need protection from the elements, particularly salt water and acidic mud. Cleaning it and then running it through a container of molten zinc should galvanize Chain for marine use. This will produce a given thickness of coating on the exterior for protection. Once again, most US and European chain manufacturers do a top quality job in this process. If any step is overlooked the chain will soon rust and stain your decks while losing its initial strength through erosion of size.

In our ground tackle specifications we must select it for three reasons. Strength, weight and its resistance to abrasion.

The importance of the strength does not need a lot of discussion. We don’t want it to break but we must determine what strength is needed for a given vessel size.

Working load limit is the maximum amount of load the chain can be expected to endure.

Proof Test is the term used to describe the tensile strength test done by the manufacturer for the purpose of finding defects in the chain. It is the maximum load the chain has been tested to. Various chain sizes are subjected to various loads to determine their suitability and quality.

Minimum breaking strength is the minimum load, which the chain was subjected to before it broke in testing. Be aware that these tests are carried out with the chain in a straight pull with a steady rate of retrieval. There are chain testing machines manufactured specifically for this purpose.

The only strength description that the purchaser should be concerned with is the working load limit. The other tests are important for other reasons but the working load limit is where you should size your chain. Under no circumstances do you want to get near the breaking point of chain. Choose it with that in mind. Though there are no absolute guides to chain sizes required, ABYC (American Boat and Yacht Council) publishes a manual called "Safety Standards for Small Craft". In this manual ABYC recommends that the working load of new chain be no more than 20 % of its breaking strength. This manual goes on to describe a variety of information related to anchors whether they are used for working anchors, storm anchors or moorings. They break down the various categories of boats such as sail and power for more precise information. Please remember that these recommendations are formulated with the assumption that the craft is anchored in a location to allow freedom to swing and that it is reasonably protected from strong wave action, which causes shock loading on the ground tackle. If you read carefully you can find the right combination to serve your purpose.

When you make the trip to the ships chandlery, resist the urge to buy el cheapo chain. You can bet it will not fit as well as the larger manufacturers products and you will find a wide variance in actual strength. You must remember that the anchor is your last, best hope against disaster when everything has gone to the devil in a hand basket. A yacht pinned to a lee shore in a blow with dubious ground tackle is not a pretty thought.

For purposes of discussion here and considering that the majority of our reader’s yachts fall into a fairly standard pattern of wind resistance and weight the following guidelines are useful.

Proof coil should be avoided due to its long link characteristics which tend to jam in the chain locker and in the hawse opening. It is cheaper than BBB or High Test but in my view not a bargain.

Chain smaller than 3/8" is ineffective at times due to its lighter weight, which allows the boat to "pick it up" as it yaws around and this will apply the load directly to the anchor. If the chain does not have sufficient weight to allow substantial catenary sag the yacht will yaw back and forth and will come tight on the chain with considerable force and noise. At times it will sound like the "eyes" of the yacht (the stem) are being pulled out as it comes tight with a crashing noise. Since the chain has no give, this hard jerking will be more likely to pull the anchor from the sea bottom and you will be adrift. Always use a stretchy piece of nylon as a snubber instead of allowing the chain to transfer the load to the windlass directly. This snubber can be bought ready made with a cats paw spliced on it, which will fit the chain. When anchoring let out the appropriate amount of chain and then attach the cats paw to a chain link forward of the wildcat. Let out about 15-20’ more of chain and of course the rope snubber. Fasten the bitter end of the nylon snubber to a cleat, with an extra hitch for safety. Let out the chain until it sags and the nylon takes the load. This will allow the chain to have a shock absorber and the anchor will stay put better. You will sleep a lot better not listening to the chain gyrations in the windlass and rollers. 5/8" nylon will work well on yachts up to about 55’ and then ¾ should be used.

To be perfectly clear, never, never allow the wildcat on the windlass to absorb the load directly. It will fail at a most inopportune moment, probably leaving you with 150 feet or more of chain out and a tough job to get it back in the anchor locker.

Consider the use of a backup nylon anchor line rather than all chain. For those of you with GBs, your yacht has a very fine (extremely deep angle) entry, which does not like weight in the bow. More than about 150’ of chain has a noticeably detrimental effect on handling and boat trim. If you load up the pulpit with heavy anchors and chain your boat will look like a snow plow, be miserable to control in a following sea and will exhibit the worst look possible in a yacht, "Down by the Head". A stainless steel screw shackle from Wichard will allow you to clip on an extra 150’ of line to your chain if you need it and the weight will be considerably less.

If you absolutely require a lot of chain consider having the chain led aft, away from the ends of the yacht to lessen the moment of inertia it produces, similar to how the Marlow Explorer is built. This method of chain storage greatly reduces weight in the ends of the boat and the chain becomes ballast, nestled deep in the bilge instead of a big lever at the ends of the boat detracting from stability and aggravating trim.

Don’t let the hippie in the van do this work unless you are absolutely confident he knows a lot about a lot of things as the geometry is fairly complicated and the penalty is a royal pain when the chain jams down below. It is not liquid fueled rocket science, but it does require careful planning and execution. This can be accomplished by an experienced yard using FRP or PVC tubing, properly installed to lead the chain down through the yacht under the berth and into a chain locker area aft of the vee berths in the bilge.

Now that you have worked your way through this article, go and inspect your ground tackle. Look at every component. Make sure it is up to the task that may be demanded of it. Make sure the shackles have safety wire on them to prevent the pin from coming loose. Yes, it will if you don’t.

Make sure the anchor is held in place by a secure secondary system beyond the windlass wildcat. If the solenoids fail on the windlass motor it may release the chain, allowing it to fall into the path of the propellers. You don’t really want to think about that level of mayhem.

Last, use the anchor. Spend some nights on the hook. The night sky is magnificent if you get away from the lights and a quiet anchorage at daybreak is one of the Sky Boss’ great creations.

What’s happening when you lift your dinghy and you hear a couple of pops, a bang and a loud squeal? Is it normal or is something getting ready to let go?

Our masts serve two real purposes and a lot of auxiliary purposes. The two real ones are; a. to hold up the anchor light and b. to make your boat look like a trawler. The auxiliary purposes include holding up the antennae and radar, supporting the bimini top and dinghy lifts and carrying the steadying sail.

These last two uses cause the biggest loads on the rigging and spars and are the ones we need to keep in mind when inspecting and maintaining our spars. The job can be separated in to four parts; spars, electrical and electronic wiring, standing (fixed) rigging, and running rigging.

Your first job should be an inspection from the deck. Make sure lights light, radar antennae go round and round, and radios transmit and receive. Check the operation of winches and running gear. Don’t trust your memory on the rigging, instead take a digital picture or two of each end of the standing rigging and some pictures of the other fittings on the mast and boom. If for some reason your rig is down for a week or two, you may find that your intimate memory has been replaced by some less useful information. Get familiar with the shackles, turnbuckles, tangs, blocks and snaps, so you will know their purpose when you raise the mast. Are the spars straight and spreaders set properly? (Look up the bolt rope slot to determine straightness. Note the quality of paint and adhesion. Are there chafe points that need protection? Does the running rigging lead properly without crossovers? Are there any strange noises or motions as the various operations are undertaken or while lying in bed at night? Identify the problems while you can so you can fix them while you have access.

Your mast and boom are made of aluminum or wood. Lower the rig and look for surface anomalies (blisters, bubbles, rot, dings or dents). Blisters and bubbles in paint often cover weaknesses in the underlying materials. Sand them off and see what is revealed. The solidity of the underlying material will lead you to the proper repair. Damage at the ends can be cut off. Damage in the middle leads to wood or metal repair or in unusual cases, spar replacement. Look over all the small parts on the standing rigging and replace any that are worn or corroded. If pop rivets or screws are missing, replace them. Check each shroud by running a cloth over the wire. If you get a snag from a broken wire, replace it. Clean end fittings well with metal polish and then look closely at them. Most are swaged and it will be hard to tell if they are about to fail. Use a magnifying glass to look for cracks and replace them if you find a crack or swelling. Replace all shrouds at one time so you always know how old your rig is.

Check the wire and end fittings on your winches in the same way and the move on to the rest of the running rigging. Look at each block (pulley) and make sure it runs smoothly and has no flat spots or burs on the sheaves. Make sure sheaves are properly sized by always having sheaves that are at least five times the size of the line passing over them.

Look over lines and replace any that are worn, pulled or frayed. Check the line ends and reseize or burn the ends to prevent unravelling.

It’s finally time to pay attention to the spars themselves. Remove the hardware after taking more photos. Thoroughly clean the spars. Sand all rough spots smooth and then sand the spar.

According to David Marlow, there are three approaches to painting a spar. The one you choose will probably be determined by your skills and available equipment. As with most other jobs, the more complex one is the one that will give the best and longest lasting results. Take all safety precautions seriously. Painting in an unventilated space is very dangerous.

Method 1. Dewax, degrease and clean the spars. Sand blast or sand the spars with 60 grit, clean up all dust, prime with zinc chromate, sand again with 220-grit, apply Awlgrip 545 gray epoxy primer,sand smooth, apply another coat of Awlgrip 545, sand smooth with 220 grit and finally apply two coats of Awlgrip White.

Method 2. Dewax, degrease and clean the spars. Use the zinc chromate and Awlgrip 545 steps of Method 1 and then topcoat with 2 coats of two-part Interlux Perfection Poyurethane.

Method 3. Dewax, degrease and clean the spars. Sand the spars with 60-grit and apply Interlux zinc chromate, clean up all dust, and apply Interlux sanding primer, or Brightside Primer, then topcoat with two coats of one-part Interlux Brightside Polyurethane.

Now that everything is bright and shiny, put it all back together, checking your pictures frequently. Raise the mast carefully and tighten the turnbuckles slowly. Check out he noises. They may be important. When everything is up and fairly tight, lift a dinghy and find out if you did it right. Now aren’t you glad you aren’t a sailor with a great big mast?

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Spring Maintenance

It is the New Year of 2006 and time to consider the fitting out in a few months of those boats stored for the winter, as well as a general refurbishment of those yachts lucky enough to spend the winter in Southern climes.

In a typical Spring updating, the emphasis is normally on cosmetic items and generic maintenance such as oil changes, fuel filter maintenance and so forth. Our timely tip for this year is to expand your work order just a bit and eliminate a fairly typical mid summer (usually at an inconvenient period) chore that is forced on us.

Most of our reliable power plants depend on a variety of belts to drive water pumps, alternators and other devices that allow us to enjoy a fine style of on board life. Until they break, they are a red headed stepchild so to speak. Ignored where possible. These belts play a huge part in the safe and reliable operation of our yachts. They produce electricity from the alternators to keep our batteries up to snuff, water to keep everything cool and so forth. When they fail or their ability to do the job is compromised, it is at least noticeable and vacation altering if they fail completely.

The cost of a new set of belts for everything on board, including a proper running in and readjustment after stretch is miniscule compared to the potential for damage, to say nothing of the inconvenience of losing precious leisure family time.

Be sure they are readjusted after about 6-8 hours run maximum if you want the best they can be.

Consider having your favorite mechanic or yard replace all of them and make sure they adjust them after a short run in period so they are set for a long trouble free run. If you meet resistance in way of "they look fine" why we just installed those in 89", consider a more energetic source of maintenance.

This site was updated on 5/19/07