Other

Home School Contact Info Boat Equipment Cruising Life

Electric Instruments Pumps Structural Communication Safety Storage Other

The watermaker... under my bed (of course) One of the main things we wanted to add to Ocelot is a watermaker. Reverse osmosis (RO) watermakers use extremely high pressure to force some seawater to become even saltier by making some pure water move through a semi-permeable membrane (exact opposite of normal osmosis, where pure water moves across a membrane to dilute saltiness.) The membrane blocks the passage of anything larger than a small portion of a micron. The resulting water is about as pure as distilled water. The excess brine, now saltier than normal, is still pressurized. However, most watermakers just dump it overboard.A closer look at the watermaker valves, pump, and, pre-filters. This picture doesn't show the switches or second pump.

One of my primary jobs when we first got on Ocelot to install a Spectra watermaker. These RO watermakers use the still pressurized brine to reduce the power required for the next stroke, and can produce several hundred gallons of fresh water per day. Of course, it still requires lots of electricity, so we don't run the watermaker that long. On the other hand, we will probably never have to go and buy water as long as the watermaker is working.

A recent modification we made to the watermaker was the addition of a second electric pressure pump, called a feed pump. The feed pump is the only part of the system which needs electricity, but it takes about eight amps (one hundred watts) DC. How powerful the feed pump(s) are has a direct affect on the production of the watermaker. By adding a second pump in parallel with the first, we can strongly increase our production (not quite double, but a significant amount nonetheless.) The electrical consumption does double (which means our efficiency goes down,) so we only use both pumps when we have lots of excess power (i.e. motoring.) In order to have a better control over these pumps, we installed two circuit breakers on the watermaker's valve panel. Although there is still a master breaker on the main electrical panel, I mainly use the two new ones to turn one pump or the other on or off.

Th fridge is finished now, but this is what it looked like as we worked on itOne of my dad's main jobs, although I helped, was to install our main refrigerator. We wanted an air cooled 12V DC system that does not need us to run the engines and is thermostat controlled. We also want it to be top opening for maximum efficiency and have a small freezer section. We acquired a box shaped evaporator plate (the inside is the freezer) and a lot of polystyrene (Styrofoam) insulation. We then coated the interior of the fridge, including the doors in the top, in fiberglass, and sanded and painted it for a smooth finish. After that, we mounted the cooling elements (we are keeping an old engine-driven holding plate for when we do run the engines.) We also installed shelves and are considering adding a water tank that lets us get cold water without opening the fridge. (Click for more about the fridge.)

Among the very first things we purchased for Ocelot in St. Martin when we arrived is an inflatable dinghy with a rigid aluminum bottom and a 25 horsepower outboard engine. This dinghy is essentially our car, allowing us to get to shore and to other boats. We have to use other transportation ashore, but any of the four of us can drive the dinghy by ourselves, and with the large engine, we can take many people as well. We also use the dinghy to go snorkeling or diving, since it can quickly take us to a good site where its small folding anchor will hold it for an hour or so while we swim. Each night, and anytime we sail, we hoist the dinghy out of the water on davits at the back of Ocelot. (Click for more about the davits.) 

Sailing certainly isn't all play, but it isn't all work either. One fun thing to do in anchorages is go out in a sailing dinghy. These small boats, which have no engines, are good fun for one or two people in light winds. That doesn't mean they require no work, however. First, it takes some work to set them up, and some to store them. More of the work, however, has been to devise a means of storing our sailing dinghy so that it won't come loose or get damaged when we take big waves over the bow. What we decided to do was to store it upside down on our tramps by attached clips. We tied on the clips and prepared the lines for tying the dinghy down. It can now be launched in a matter of minutes, and secured just as quickly. Best of all, it is not going to damage itself or Ocelot.

Up | Electric | Instruments | Pumps | Structural | Communication | Safety | Storage | Other

School | Contact Info | Boat Equipment | Cruising Life

Top Level: Home | Destinations | Cruising Info | Underwater | Boat Guests | Ocelot | Sue | Jon | Amanda | Chris | Site Map | Make a Comment

This site is
sponsored by:
The Triton - Nautical News for Captains and Crews

Copyright  2000‑2014 Jon and Sue Hacking -- HackingFamily.com, svOcelot.comAll rights reserved.