
George - after installing the Frankenmaker MKI aboard sv Third Day.
“It was already one in the morning; the rain pattered dismally against the panes, and my candle was nearly burnt out, when, by the glimmer of the half-extinguished light, I saw the dull yellow eye of the creature open . . .”
– Mary Shelly
So I guess it starts with a need. They say that necessity is a mother. That’s true and what’s more, water is the mother of all necessities. A person can live for weeks without food but only days without water. We need fresh water for survival. It’s a basic human need for staying alive, and for us it’s more than that. We need lots of fresh water to stay healthy, hygienically and emotionally. It just makes us happy. On a transatlantic crossing, under water rations, I promised Kerri she would never ever have to conserve water on Marquesa; we would have all the water we ever needed.
First I did all the research I could reasonably do online about watermakers. I discovered several places describing some home-built units, as well as finding two different plans on eBay. I purchased both sets of eBay plans, and gained enough knowledge to design my own system.
But how much water is enough? I decided that what we needed was 40-50 gallons per hour of production. That would allow us to run a watermaker (they tend to be noisy) for only a half hour per day average. With this figure in mind, I had to decide on what type of watermaker. I picked reverse osmosis as the most practical. For that kind of production, I would need membranes and pressure vessels capable of that output range, and I went with American R/0 for that. The units we use are about 2.5 inches by about a yard long. Then I had to decide how to drive the high pressure pump for the watermaker, and I chose mechanical belt drive. This would allow for the greatest efficiency and allow the versatility to use either a small aux. diesel or the boat’s main diesel engine.
I knew I’d need a pump that could output 5 gallons per hour at around 800 psi, and I went with the Giant Pump that had nearly exactly that capacity at around 1700 rpm. Of course that pump had a horse power requirement of around 5 hp at that rpm to produce the 5gpm, so I found an army surplus single cylinder diesel motor (Kubota) that had previously seen cold war duty (something I can also claim). I ordered the motor on eBay.
I also procured piecemeal the various plumbing parts, pulleys, belts, yada yada… which details I will not bore you with.
At that point it was time to get out the welder and start “gluing” metal together. I had to take care that the finished product could fit into the space I had. Measure twice, cut once, they say.
I actually made two Frankenmakers. The MKI went in the Boren family’s boat “sv Third Day”. So far as I know it’s still in service on the West Coast. Rich went on to design and build CruiseRO systems using the same KISS approach I took with the Frankenmakers. It’s truly to the point that if I had it to do again today, I’d simply purchase a CruiseRO unit rather than build my own. The fit and finish of those units is very shiny, and the warranty is the best in the industry.
The MKII had an added feature in that we have cold plate refrigeration on Marquesa. So every day we run the little thrifty Kubota to make our refrigerator and freezer as cold as we like while saving hours off the boat’s main engine. Both the MKI and MKII were also fitted with DC alternators for charging ship’s batteries. Why not?
The Frankenmaker has been in service aboard sv Marquesa, providing us with all the water we need including a lot of laundry, for over 2 years now. It has been the least troublesome piece of equipment that we use every single day.
I installed the Frankenmaker in Marquesa in such a way that we could, in an emergency, belt it off of the main engine. That’s never happened but it’s a nice redundancy for us. We like redundancy in systems.
Because we went with the silicone/bronze pump we have not had to back-flush the unit ever. We run it several times per week and then when we are home, we do a thorough flush and pickle job for long-term storage. Other than that we do regular oil changes on the motor, and we change the pre-filters when needed.
The following is a series of pictures showing the entire Frankenmaker production:
This is a 6 HP Kubota Diesel motor. A former tool of the Cold War (like me!) it was attached to tank haulers as an APU to lift ramps and steer back wheels around little German towns… So now it needs a kinder gentler purpose (like me!) and in a swords to plow shears way, it’s becoming the public works department on S/V Marquesa.
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This is the template I kept from the MK I unit. The Frankenmaker MK I is in service on the West Coast currently making electricity and fresh water for a family of 4.
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First steps in making the alternator bracket.
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Alternator bracket complete.
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A nice paint job with the alternator basically installed.
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Another view showing the jack shaft.
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Here the high pressure pump for the desalinator has been installed.
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Here is the welded up mounting frame with the refrigeration pump mocked up. The refrigeration pump is going to pull down some holdover plates that have eutectic solution in them. Those will then thaw out at a specific temperature over a 24 hour period (or more). This way we can have a big freezer and refrigerator box on board. We can carry up to 6 months of food with us, stretching this with what we can catch to last even longer.
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Here’s another view of the frame and refrigeration pump.
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Measuring for the belt for the refrigeration unit with the unit installed on the frame.
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Another angle.
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Welding up the exhaust. It’s convenient on boats to cool the exhaust with water and then send it out the boat.
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So here is the exhaust riser/mixing elbow installed along with the cooling fan and cowling.
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On the skid ready to go down to the boat!
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Inside our engine room – the pedestals are glassed in and the frame is mounted in place.
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Here is the Frankenmaker basic unit installed. I’ve aligned it so that the refrigeration pump will be able to run off the main engine in the event we will be motoring anyway or something happens to the Kubota.
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Here it is with the equipment installed and belted up. Nearly all the wiring is roughed in.
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Another angle.
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Those white tubes in the background are the pressure vessels with the membranes for the desalination function.
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Another view of the pressure vessels.
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The control panel pulled out for testing stage.
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That’s 50 gallons per hour with only 165ppm.