Clark Beek

New Chainplates

30 Nov

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I had to remove a few chainplates for an unrelated project and one of them broke upon removal. I guess I can count myself lucky it happened this way, rather than in full combat mode. Only 49 years old, and it just fell apart in my hand! I plan to write a strongly-worded letter to these Alpha England people about the quality of their product:
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I blame the dreaded crevice corrosion:
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Years ago I read something about replacing stainless chainplates with titanium, which is stronger, doesn’t corrode, doesn’t crack, and yada yada. I looked into it, and Holy Halyard Slaps! ...

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What Is It?

8 Nov

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I was working on a boat in a dry storage area in San Leandro, California, when I saw the boat above. What this strange aperture in its side? On closer inspection the outside of the aperture has fixed vents, made out of plywood:
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This outside part does not rotate. In the middle is a galvanized steel pipe, which is designed to rotate, as it is supported by several carrier bearings athwartships:
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But on the other side of the boat this axle just sticks out an inch through another hole in the topside, with nothing like the contraption on the starboard ...

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Advanced Electrical: Galvanic Isolator Case Study

4 Nov

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Once I was buying a galvanic isolator in a West Marine store, when a West Marine employee, of all people, was really insistent that I shouldn’t buy it: “Those things are a scam! They don’t do anything. I have it on good authority that they’re a big waste of money!” He had that look in his eye, so rather than get all marine electrician on his ass, I just said, “Well, my customer wants it, so I think I’ll buy it all the same.” There are a lot of misconceptions about the purpose of a galvanic isolator, and what it ...

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Advanced Electrical: Galvanic Isolator Case Study

4 Nov

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Once I was buying a galvanic isolator in a West Marine store, when a West Marine employee, of all people, was really insistent that I shouldn’t buy it: “Those things are a scam! They don’t do anything. I have it on good authority that they’re a big waste of money!” He had that look in his eye, so rather than get all marine electrician on his ass, I just said, “Well, my customer wants it, so I think I’ll buy it all the same.” There are a lot of misconceptions about the purpose of a galvanic isolator, and what it ...

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Teaching Marine Electrical Seminar In Sausalito This Saturday

25 Oct

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How many wrong things can you find in this picture?

If you happen to be in the Bay Area this Saturday, October 29th, I’m giving a marine electrical seminar at Spaulding Marine Center in Sausalito, where I will teach electrical excellence, simplicity, and how not to get electrocuted. They suggest a $50 donation and always provide a great lunch. Starts at 10:00AM; goes to about 2:30. Please RSVP. Link here for registration ...

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Electrical Basics: Bus Bars

17 Oct

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Just twenty or thirty years ago the electrical system on the average sailboat was very simple. It had two batteries connected to an OFF-1-2-BOTH battery switch, and all the loads were fed from there:
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On the back of the battery switch were three studs: one for each battery, and one for the common, that is, the terminal that connects to the alternator and all the loads:

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The battery switch for this Catalina 30 is this way. In addition to the connection to each battery, the battery studs on the back of the switch are good places to connect the outputs ...

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Boat Command CONNECT! Meets Smoke Alarm

1 Aug

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The manufacturers of Boat Command, the boat monitoring platform, didn’t build the system with a smoke alarm option. It’s got all manner of sensors, inputs, and alerts, but no smoke alarm, and if you read Boat US’s statistics on boat losses and insurance claims, fire is number five. Stats aside, the main things I worry about while I’m away from my boat are flooding (that’s a big number 1), fire, break-ins, theft, and dead batteries. These are the main reasons I installed the Boat Command system, but it does lots of other neat stuff too. Full disclosure: as ...

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The Truth About Watermaker Membranes…

24 Jun

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…is that they’ve gotten pretty cheap.

In not-too-distant past replacing a single membrane on a small watermaker was a $600-$800 hit. Now, as with so many other things, you can go online and buy a membrane for $150-$220. And it doesn’t matter whether you’re replacing a 20-inch membrane or a 40-inch – the two most common sizes – the price is the same.

Before I go any farther, when a watermaker is performing poorly it is seldom the membrane, but the membrane is the first thing people want to blame. You must first ensure that everything else is within spec ...

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New Cooling System on Perkins 4.236

16 Jun

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This upgrade is common to all older Perkins diesels (the Perkins 4.108 is probably the most common Perkins found on boats). Bowman, the company that made the marinizing equipment for Perkins, has re-engineered things over the years, so that instead of having a combination header tank and heat exchanger on one part of the engine, and a water jacketed exhaust on another, they combine it all into a combination header tank/heat exchanger/exhaust manifold.

These engines were originally fitted with oil coolers. Now in some cases they say you can do away with the oil cooler unless your engine is run ...

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The Future Is Here: Bottom Cleaning Nanobots

1 Apr

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With copper-based antifouling paints just being banned in Washington state, the writing is on the wall. We’re going to have to figure out an an environmentally-friendly way to keep the critters from growing on the bottoms of our boats. That’s where BottomBot comes in.

Dan Stein, BottomBot’s CEO says, “We took our technology from the medical industry, where nanobots have long been in development. There is a family of nanobots designed to be released in the blood stream to remove plaque from the insides of your arteries. These nanobots aren’t quite ready for prime time in medicine, for safety ...

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