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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #21  
Old 11-07-2007
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John, I will be awaiting the results of your SailFan experiments with voracious denial.
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  #22  
Old 11-07-2007
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Agreed

Hello,

I totally agree, which is why my boat has a raw water pump and a heat exchanger I am not at all bothered by the fact that I am sucking up corrosive sea water and using that to cool the coolant in the engine.

The original post was concerned, so I just offered a tried and true method of cooling an engine. I don't think a air - water cooled radiator makes sense, but to each their own.

Barry




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Originally Posted by JohnRPollard View Post
This is essentially what I was describing in the last pararaph of my previous post, except adapted for the marine application. Autos have the huge advantage of their engines being mounted externally, and having massive air flow over the radiator surface at loaded operating speeds (supplemented by fans at idle). In a sailboat, even if you mounted the radiator externally, you wouldn't have the same volume of air moving across it. Usually the air cooling of the coolant (via ducts and fans) is augmented with a jumbo oil reserve and separate air-cooled oil cooler.

It's not a very practical approach for cooling a small boat engine. Not to mention the added complexity of mufflers etc for the dry exhaust, along with the fumes and heat.
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  #23  
Old 11-07-2007
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Barry,

I was just rambling... And I'm with you on the corrosive sea-water -- the heater exchanger should last decades with proper use -- not bad service considering. Perhaps I'm in the minority, but I've always felt it was an elegantly simple solution.

Hey, I'm glad TrueBlue mentioned it, becuase now it occurs to me that maybe we could direct the thrust from the SailFans to also blow air on the radiator? This could be even more revolutionary than any of us realized...
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  #24  
Old 11-07-2007
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You know guys, I know I'm going to catch hell on this one, But..ITS A SAILBOAT..With a note on SAIL... If you dont like the way the motor works, put the sails up.....and if you find you're spending more time motoring and less time sailing, maybe its time to go over to the DARK SIDE.......
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  #25  
Old 11-09-2007
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Randy...

Very well said. All we need our OB for is getting in and out of the marina and that's because the marina is on a large river. Next year this time we will be on a 6 month cruise in the Bahamas and engine time should be about 3 hrs for the trip.
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  #26  
Old 11-10-2007
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I wonder if you had a steel hulled boat and then ran the hot water through copper coils that were fixed to the inside of the hull.....I suppose the problem would be how to keep the maximum amount of surface area of the coils fixed to the hull.

Jerry
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  #27  
Old 11-10-2007
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Quote:
Originally Posted by RandyonR3 View Post
You know guys, I know I'm going to catch hell on this one, But..ITS A SAILBOAT..With a note on SAIL... If you dont like the way the motor works, put the sails up.....and if you find you're spending more time motoring and less time sailing, maybe its time to go over to the DARK SIDE.......
I don't know where you live, but in the PN, we can get weeks and weeks of no/little wind in the summer. Often the best weather to be out on the water it's very still. Wind or not I'm gonna be out there. I would obviously prefer to sail, but sometimes the wind doesn't co-operate. We also have to deal with tons of shoals and reefs, very high currents, and crazy tides, and I'm glad I've got the iron jenny as backup.
Sometimes you just can't count on nature.

I dunno about your engine, but the westerbeke bolt-on components have a less than stellar rep. It is a basic system and you would think it would be reliable, but I've had to rebuild my jabsco saltwater pump 3X since I bought this crazy boat. And there have been several posts on the CSOA website with people having problems with the heat exchanger system.

I think it can be simpler, that's all. I just wonder if anyone has tried conducting the excess heat through the hull. Obviously a steel boat would be better to test this, but I don't think it's a requirement. When I get some time I would like to look at the numbers further.
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  #28  
Old 11-10-2007
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Quote:
Originally Posted by jerryrlitton View Post
I wonder if you had a steel hulled boat and then ran the hot water through copper coils that were fixed to the inside of the hull.....I suppose the problem would be how to keep the maximum amount of surface area of the coils fixed to the hull.
I've seen motor boats with this, not planing hulls, they use single straight pipes about 10 ft long, aligned with the flow, it works. Also some steel sailing boats use no raw water inlet, the cooling water is circulated through a part of the integral keel. I suppose a GRP boat could do the same trick. Giu could have his shark modified to have pipes running down inside the fin and back.
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  #29  
Old 11-10-2007
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Quote:
Originally Posted by Idiens View Post
. . . Giu could have his shark modified to have pipes running down inside the fin and back.
This would a good project. His shark could open the mouth and cool through the gills when motoring.
Of course for less drag the shark would close the mouth and the gills.
Very simple and basic to implement and maintain
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  #30  
Old 11-10-2007
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That's it Tomaz, a variable geometry engine cooling keel. The hydrodynamic equivalent to the solar stick.
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